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	diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
	index da2c7186..d7ace944 100644
	--- a/plugins/calendar/calendar_ui.js
	+++ b/plugins/calendar/calendar_ui.js
	@@ -1,4250 +1,4250 @@
	/**
	* Client UI Javascript for the Calendar plugin
	*
	* @author Lazlo Westerhof <hello@lazlo.me>
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* @licstart The following is the entire license notice for the
	* JavaScript code in this file.
	*
	* Copyright (C) 2010, Lazlo Westerhof <hello@lazlo.me>
	* Copyright (C) 2014-2015, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	* @licend The above is the entire license notice
	* for the JavaScript code in this file.
	*/

	// Roundcube calendar UI client class
	function rcube_calendar_ui(settings)
	{
	// extend base class
	rcube_calendar.call(this, settings);

	/* member vars */
	this.is_loading = false;
	this.selected_event = null;
	this.selected_calendar = null;
	this.search_request = null;
	this.saving_lock = null;
	this.calendars = {};
	this.quickview_sources = [];


	/* private vars */
	var DAY_MS = 86400000;
	var HOUR_MS = 3600000;
	var me = this;
	var gmt_offset = (new Date().getTimezoneOffset() / -60) - (settings.timezone \|\| 0) - (settings.dst \|\| 0);
	var client_timezone = new Date().getTimezoneOffset();
	var day_clicked = day_clicked_ts = 0;
	var ignore_click = false;
	var event_defaults = { free_busy:'busy', alarms:'' };
	var event_attendees = [];
	var calendars_list;
	var calenders_search_list;
	var calenders_search_container;
	var search_calendars = {};
	var attendees_list;
	var resources_list;
	var resources_treelist;
	var resources_data = {};
	var resources_index = [];
	var resource_owners = {};
	var resources_events_source = { url:null, editable:false };
	var freebusy_ui = { workinhoursonly:false, needsupdate:false };
	var freebusy_data = {};
	var current_view = null;
	var count_sources = [];
	var exec_deferred = bw.ie6 ? 5 : 1;
	var sensitivitylabels = { 'public':rcmail.gettext('public','calendar'), 'private':rcmail.gettext('private','calendar'), 'confidential':rcmail.gettext('confidential','calendar') };
	var ui_loading = rcmail.set_busy(true, 'loading');

	// general datepicker settings
	var datepicker_settings = {
	// translate from fullcalendar format to datepicker format
	dateFormat: settings['date_format'].replace(/M/g, 'm').replace(/mmmmm/, 'MM').replace(/mmm/, 'M').replace(/dddd/, 'DD').replace(/ddd/, 'D').replace(/yy/g, 'y'),
	firstDay : settings['first_day'],
	dayNamesMin: settings['days_short'],
	monthNames: settings['months'],
	monthNamesShort: settings['months'],
	changeMonth: false,
	showOtherMonths: true,
	selectOtherMonths: true
	};

	// global fullcalendar settings
	var fullcalendar_defaults = {
	aspectRatio: 1,
	ignoreTimezone: true, // will treat the given date strings as in local (browser's) timezone
	monthNames : settings.months,
	monthNamesShort : settings.months_short,
	dayNames : settings.days,
	dayNamesShort : settings.days_short,
	firstDay : settings.first_day,
	firstHour : settings.first_hour,
	slotMinutes : 60/settings.timeslots,
	timeFormat: {
	'': settings.time_format,
	agenda: settings.time_format + '{ - ' + settings.time_format + '}',
	list: settings.time_format + '{ - ' + settings.time_format + '}',
	table: settings.time_format + '{ - ' + settings.time_format + '}'
	},
	axisFormat : settings.time_format,
	columnFormat: {
	month: 'ddd', // Mon
	week: 'ddd ' + settings.date_short, // Mon 9/7
	day: 'dddd ' + settings.date_short, // Monday 9/7
	table: settings.date_agenda
	},
	titleFormat: {
	month: 'MMMM yyyy',
	week: settings.dates_long,
	day: 'dddd ' + settings['date_long'],
	table: settings.dates_long
	},
	listPage: 7, // advance one week in agenda view
	listRange: settings.agenda_range,
	listSections: settings.agenda_sections,
	tableCols: ['handle', 'date', 'time', 'title', 'location'],
	defaultView: rcmail.env.view \|\| settings.default_view,
	allDayText: rcmail.gettext('all-day', 'calendar'),
	buttonText: {
	prev: ' ◄ ',
	next: ' ► ',
	today: settings['today'],
	day: rcmail.gettext('day', 'calendar'),
	week: rcmail.gettext('week', 'calendar'),
	month: rcmail.gettext('month', 'calendar'),
	table: rcmail.gettext('agenda', 'calendar')
	},
	listTexts: {
	until: rcmail.gettext('until', 'calendar'),
	past: rcmail.gettext('pastevents', 'calendar'),
	today: rcmail.gettext('today', 'calendar'),
	tomorrow: rcmail.gettext('tomorrow', 'calendar'),
	thisWeek: rcmail.gettext('thisweek', 'calendar'),
	nextWeek: rcmail.gettext('nextweek', 'calendar'),
	thisMonth: rcmail.gettext('thismonth', 'calendar'),
	nextMonth: rcmail.gettext('nextmonth', 'calendar'),
	future: rcmail.gettext('futureevents', 'calendar'),
	week: rcmail.gettext('weekofyear', 'calendar')
	},
	currentTimeIndicator: settings.time_indicator,
	// event rendering
	eventRender: function(event, element, view) {
	if (view.name != 'list' && view.name != 'table') {
	var prefix = event.sensitivity && event.sensitivity != 'public' ? String(sensitivitylabels[event.sensitivity]).toUpperCase()+': ' : '';
	element.attr('title', prefix + event.title);
	}
	if (view.name != 'month') {
	if (event.location) {
	element.find('div.fc-event-title').after('<div class="fc-event-location">@ ' + Q(event.location) + '</div>');
	}
	if (event.sensitivity && event.sensitivity != 'public')
	element.find('div.fc-event-time').append('<i class="fc-icon-sensitive"></i>');
	if (event.recurrence)
	element.find('div.fc-event-time').append('<i class="fc-icon-recurring"></i>');
	if (event.alarms \|\| (event.valarms && event.valarms.length))
	element.find('div.fc-event-time').append('<i class="fc-icon-alarms"></i>');
	}
	if (event.status) {
	element.addClass('cal-event-status-' + String(event.status).toLowerCase());
	}

	element.attr('aria-label', event.title + ', ' + me.event_date_text(event, true));
	},
	// render element indicating more (invisible) events
	overflowRender: function(data, element) {
	element.html(rcmail.gettext('andnmore', 'calendar').replace('$nr', data.count))
	.click(function(e){ me.fisheye_view(data.date); });
	},
	// callback when a specific event is clicked
	eventClick: function(event, ev, view) {
	if (!event.temp && String(event.className).indexOf('fc-type-freebusy') < 0)
	event_show_dialog(event, ev);
	}
	};

	/* imports */
	var Q = this.quote_html;
	var text2html = this.text2html;
	var event_date_text = this.event_date_text;
	var parse_datetime = this.parse_datetime;
	var date2unixtime = this.date2unixtime;
	var fromunixtime = this.fromunixtime;
	var parseISO8601 = this.parseISO8601;
	var date2servertime = this.date2ISO8601;
	var render_message_links = this.render_message_links;


	/* private methods */

	// same as str.split(delimiter) but it ignores delimiters within quoted strings
	var explode_quoted_string = function(str, delimiter)
	{
	var result = [],
	strlen = str.length,
	q, p, i, chr, last;

	for (q = p = i = 0; i < strlen; i++) {
	chr = str.charAt(i);
	if (chr == '"' && last != '\\') {
	q = !q;
	}
	else if (!q && chr == delimiter) {
	result.push(str.substring(p, i));
	p = i + 1;
	}
	last = chr;
	}

	result.push(str.substr(p));
	return result;
	};

	// Change the first charcter to uppercase
	var ucfirst = function(str)
	{
	return str.charAt(0).toUpperCase() + str.substr(1);
	};

	// clone the given date object and optionally adjust time
	var clone_date = function(date, adjust)
	{
	var d = new Date(date.getTime());

	// set time to 00:00
	if (adjust == 1) {
	d.setHours(0);
	d.setMinutes(0);
	}
	// set time to 23:59
	else if (adjust == 2) {
	d.setHours(23);
	d.setMinutes(59);
	}

	return d;
	};

	// fix date if jumped over a DST change
	var fix_date = function(date)
	{
	if (date.getHours() == 23)
	date.setTime(date.getTime() + HOUR_MS);
	else if (date.getHours() > 0)
	date.setHours(0);
	};

	var date2timestring = function(date, dateonly)
	{
	return date2servertime(date).replace(/[^0-9]/g, '').substr(0, (dateonly ? 8 : 14));
	}

	var format_datetime = function(date, mode, voice)
	{
	return me.format_datetime(date, mode, voice);
	}

	var render_link = function(url)
	{
	var islink = false, href = url;
	if (url.match(/^[fhtpsmailo]+?:\/\//i)) {
	islink = true;
	}
	else if (url.match(/^[a-z0-9.-:]+(\/\|$)/i)) {
	islink = true;
	href = 'http://' + url;
	}
	return islink ? '<a href="' + Q(href) + '" target="_blank">' + Q(url) + '</a>' : Q(url);
	}

	// determine whether the given date is on a weekend
	var is_weekend = function(date)
	{
	return date.getDay() == 0 \|\| date.getDay() == 6;
	};

	var is_workinghour = function(date)
	{
	if (settings['work_start'] > settings['work_end'])
	return date.getHours() >= settings['work_start'] \|\| date.getHours() < settings['work_end'];
	else
	return date.getHours() >= settings['work_start'] && date.getHours() < settings['work_end'];
	};

	// check if the event has 'real' attendees, excluding the current user
	var has_attendees = function(event)
	{
	return (event.attendees && event.attendees.length && (event.attendees.length > 1 \|\| String(event.attendees[0].email).toLowerCase() != settings.identity.email));
	};

	// check if the current user is an attendee of this event
	var is_attendee = function(event, role, email)
	{
	var emails = email ? ';'+email.toLowerCase() : settings.identity.emails;
	for (var i=0; event.attendees && i < event.attendees.length; i++) {
	if ((!role \|\| event.attendees[i].role == role) && event.attendees[i].email && emails.indexOf(';'+event.attendees[i].email.toLowerCase()) >= 0)
	return event.attendees[i];
	}
	return false;
	};

	// check if the current user is the organizer
	var is_organizer = function(event, email)
	{
	return is_attendee(event, 'ORGANIZER', email) \|\| !event.id;
	};

	/**
	* Check permissions on the given calendar object
	*/
	var has_permission = function(cal, perm)
	{
	// multiple chars means "either of"
	if (String(perm).length > 1) {
	for (var i=0; i < perm.length; i++) {
	if (has_permission(cal, perm[i]))
	return true;
	}
	}

	if (cal.rights && String(cal.rights).indexOf(perm) >= 0) {
	return true;
	}

	return (perm == 'i' && cal.editable) \|\| (perm == 'v' && cal.editable);
	}

	var load_attachment = function(event, att)
	{
	var query = { _id: att.id, _event: event.recurrence_id \|\| event.id, _cal:event.calendar, _frame: 1 };
	if (event.rev)
	query._rev = event.rev;

	if (event.calendar == "--invitation--itip")
	$.extend(query, {_uid: event._uid, _part: event._part, _mbox: event._mbox});

	// open attachment in frame if it's of a supported mimetype
	if (id && att.mimetype && $.inArray(att.mimetype, settings.mimetypes)>=0) {
	if (rcmail.open_window(rcmail.url('get-attachment', query), true, true)) {
	return;
	}
	}

	query._frame = null;
	query._download = 1;
	rcmail.goto_url('get-attachment', query, false);
	};

	// build event attachments list
	var event_show_attachments = function(list, container, event, edit)
	{
	var i, id, len, img, content, li, elem,
	ul = document.createElement('UL');
	ul.className = 'attachmentslist';

	for (i=0, len=list.length; i<len; i++) {
	elem = list[i];
	li = document.createElement('LI');
	li.className = elem.classname;

	if (edit) {
	rcmail.env.attachments[elem.id] = elem;
	// delete icon
	content = $('<a href="#delete" />')
	.attr('title', rcmail.gettext('delete'))
	.attr('aria-label', rcmail.gettext('delete') + ' ' + Q(elem.name))
	.addClass('delete')
	.click({id: elem.id}, function(e) { remove_attachment(this, e.data.id); return false; });

	if (!rcmail.env.deleteicon)
	content.html(rcmail.gettext('delete'));
	else {
	img = document.createElement('IMG');
	img.src = rcmail.env.deleteicon;
	img.alt = rcmail.gettext('delete');
	content.append(img);
	}

	content.appendTo(li);
	}

	// name/link
	content = $('<a href="#load" />')
	.html(Q(elem.name))
	.addClass('file')
	.click({event: event, att: elem}, function(e) {
	load_attachment(e.data.event, e.data.att);
	return false;
	})
	.appendTo(li);

	ul.appendChild(li);
	}

	if (edit && rcmail.gui_objects.attachmentlist) {
	ul.id = rcmail.gui_objects.attachmentlist.id;
	rcmail.gui_objects.attachmentlist = ul;
	}

	container.empty().append(ul);
	};

	var remove_attachment = function(elem, id)
	{
	$(elem.parentNode).hide();
	rcmail.env.deleted_attachments.push(id);
	delete rcmail.env.attachments[id];
	};

	// event details dialog (show only)
	var event_show_dialog = function(event, ev, temp)
	{
	var $dialog = $("#eventshow");
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:false, rights:'lrs' };

	if (!temp)
	me.selected_event = event;

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	// remove status-* and sensitivity-* classes
	$dialog.removeClass(function(i, oldclass) {
	var oldies = String(oldclass).split(' ');
	return $.grep(oldies, function(cls) { return cls.indexOf('status-') === 0 \|\| cls.indexOf('sensitivity-') === 0 }).join(' ');
	});

	// convert start/end dates if not done yet by fullcalendar
	if (typeof event.start == 'string')
	event.start = parseISO8601(event.start);
	if (typeof event.end == 'string')
	event.end = parseISO8601(event.end);

	// allow other plugins to do actions when event form is opened
	rcmail.triggerEvent('calendar-event-init', {o: event});

	$dialog.find('div.event-section, div.event-line').hide();
	$('#event-title').html(Q(event.title)).show();

	if (event.location)
	$('#event-location').html('@ ' + text2html(event.location)).show();
	if (event.description)
	$('#event-description').show().children('.event-text').html(text2html(event.description, 300, 6));
	if (event.vurl)
	$('#event-url').show().children('.event-text').html(render_link(event.vurl));

	// render from-to in a nice human-readable way
	// -> now shown in dialog title
	// $('#event-date').html(Q(me.event_date_text(event))).show();

	if (event.recurrence && event.recurrence_text)
	$('#event-repeat').show().children('.event-text').html(Q(event.recurrence_text));

	if (event.valarms && event.alarms_text)
	$('#event-alarm').show().children('.event-text').html(Q(event.alarms_text));

	if (calendar.name)
	$('#event-calendar').show().children('.event-text').html(Q(calendar.name)).attr('class', 'event-text cal-'+calendar.id).css('color', calendar.textColor \|\| calendar.color \|\| '');
	if (event.categories)
	$('#event-category').show().children('.event-text').html(Q(event.categories)).attr('class', 'event-text cat-'+String(event.categories).toLowerCase().replace(rcmail.identifier_expr, ''));
	if (event.free_busy)
	$('#event-free-busy').show().children('.event-text').html(Q(rcmail.gettext(event.free_busy, 'calendar')));
	if (event.priority > 0) {
	var priolabels = [ '', rcmail.gettext('highest'), rcmail.gettext('high'), '', '', rcmail.gettext('normal'), '', '', rcmail.gettext('low'), rcmail.gettext('lowest') ];
	$('#event-priority').show().children('.event-text').html(Q(event.priority+' '+priolabels[event.priority]));
	}

	if (event.status) {
	var status_lc = String(event.status).toLowerCase();
	$('#event-status').show().children('.event-text').text(rcmail.gettext('status-'+status_lc,'calendar'));
	$('#event-status-badge > span').text(rcmail.gettext('status-'+status_lc,'calendar'));
	$dialog.addClass('status-'+status_lc);
	}
	if (event.sensitivity && event.sensitivity != 'public') {
	$('#event-sensitivity').show().children('.event-text').text(sensitivitylabels[event.sensitivity]);
	$('#event-status-badge > span').text(sensitivitylabels[event.sensitivity]);
	$dialog.addClass('sensitivity-'+event.sensitivity);
	}
	if (event.created \|\| event.changed) {
	var created = parseISO8601(event.created),
	changed = parseISO8601(event.changed)
	$('#event-created-changed .event-created').html(Q(created ? format_datetime(created) : rcmail.gettext('unknown','calendar')))
	$('#event-created-changed .event-changed').html(Q(changed ? format_datetime(changed) : rcmail.gettext('unknown','calendar')))
	$('#event-created-changed').show()
	}

	// create attachments list
	if ($.isArray(event.attachments)) {
	event_show_attachments(event.attachments, $('#event-attachments').children('.event-text'), event);
	if (event.attachments.length > 0) {
	$('#event-attachments').show();
	}
	}
	else if (calendar.attachments) {
	// fetch attachments, some drivers doesn't set 'attachments' prop of the event?
	}

	// build attachments list
	$('#event-links').hide();
	if ($.isArray(event.links) && event.links.length) {
	render_message_links(event.links \|\| [], $('#event-links').children('.event-text'), false, 'calendar');
	$('#event-links').show();
	}

	// list event attendees
	if (calendar.attendees && event.attendees) {
	// sort resources to the end
	event.attendees.sort(function(a,b) {
	var j = a.cutype == 'RESOURCE' ? 1 : 0,
	k = b.cutype == 'RESOURCE' ? 1 : 0;
	return (j - k);
	});

	var data, organizer, mystatus = null, rsvp, line, morelink, html = '', overflow = '';
	for (var j=0; j < event.attendees.length; j++) {
	data = event.attendees[j];
	if (data.email) {
	if (data.role == 'ORGANIZER')
	organizer = true;
	else if (settings.identity.emails.indexOf(';'+data.email) >= 0) {
	mystatus = data.status.toLowerCase();
	if (data.status == 'NEEDS-ACTION' \|\| data.status == 'TENTATIVE' \|\| data.rsvp)
	rsvp = mystatus;
	}
	}

	line = rcube_libcalendaring.attendee_html(data);

	if (morelink)
	overflow += line;
	else
	html += line;

	// stop listing attendees
	if (j == 7 && event.attendees.length >= 7) {
	morelink = $('<a href="#more" class="morelink"></a>').html(rcmail.gettext('andnmore', 'calendar').replace('$nr', event.attendees.length - j - 1));
	}
	}

	if (html && (event.attendees.length > 1 \|\| !organizer)) {
	$('#event-attendees').show()
	.children('.event-text')
	.html(html)
	.find('a.mailtolink').click(event_attendee_click);

	// display all attendees in a popup when clicking the "more" link
	if (morelink) {
	$('#event-attendees .event-text').append(morelink);
	morelink.click(function(e){
	rcmail.show_popup_dialog(
	'<div id="all-event-attendees" class="event-attendees">' + html + overflow + '</div>',
	rcmail.gettext('tabattendees','calendar'),
	null,
	{ width:450, modal:false });
	$('#all-event-attendees a.mailtolink').click(event_attendee_click);
	return false;
	})
	}
	}

	if (mystatus && !rsvp) {
	$('#event-partstat').show().children('.changersvp')
	.removeClass('accepted tentative declined delegated needs-action')
	.addClass(mystatus)
	.children('.event-text')
	.text(rcmail.gettext('status' + mystatus, 'libcalendaring'));
	}

	var show_rsvp = rsvp && !is_organizer(event) && event.status != 'CANCELLED' && has_permission(calendar, 'v');
	$('#event-rsvp')[(show_rsvp ? 'show' : 'hide')]();
	$('#event-rsvp .rsvp-buttons input').prop('disabled', false).filter('input[rel='+mystatus+']').prop('disabled', true);

	if (show_rsvp && event.comment)
	$('#event-rsvp-comment').show().children('.event-text').html(Q(event.comment));

	$('#event-rsvp a.reply-comment-toggle').show();
	$('#event-rsvp .itip-reply-comment textarea').hide().val('');

	if (event.recurrence && event.id) {
	var sel = event._savemode \|\| (event.thisandfuture ? 'future' : (event.isexception ? 'current' : 'all'));
	$('#event-rsvp .rsvp-buttons').addClass('recurring');
	}
	else {
	$('#event-rsvp .rsvp-buttons').removeClass('recurring');
	}
	}

	var buttons = [];
	if (!temp && calendar.editable && event.editable !== false) {
	buttons.push({
	text: rcmail.gettext('edit', 'calendar'),
	click: function() {
	event_edit_dialog('edit', event);
	}
	});
	}
	if (!temp && has_permission(calendar, 'td') && event.editable !== false) {
	buttons.push({
	text: rcmail.gettext('delete', 'calendar'),
	'class': 'delete',
	click: function() {
	me.delete_event(event);
	$dialog.dialog('close');
	}
	});
	}

	if (!buttons.length) {
	buttons.push({
	text: rcmail.gettext('close', 'calendar'),
	click: function(){
	$dialog.dialog('close');
	}
	});
	}

	// open jquery UI dialog
	$dialog.dialog({
	modal: false,
	resizable: !bw.ie6,
	closeOnEscape: (!bw.ie6 && !bw.ie7), // disable for performance reasons
	title: me.event_date_text(event),
	open: function() {
	$dialog.attr('aria-hidden', 'false');
	setTimeout(function(){
	$dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
	}, 5);
	},
	close: function() {
	$dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
	rcmail.command('menu-close','eventoptionsmenu');
	$('.libcal-rsvp-replymode').hide();
	},
	dragStart: function() {
	rcmail.command('menu-close','eventoptionsmenu');
	$('.libcal-rsvp-replymode').hide();
	},
	resizeStart: function() {
	rcmail.command('menu-close','eventoptionsmenu');
	$('.libcal-rsvp-replymode').hide();
	},
	buttons: buttons,
	minWidth: 320,
	width: 420
	}).show();

	// remember opener element (to be focused on close)
	$dialog.data('opener', ev && rcube_event.is_keyboard(ev) ? ev.target : null);

	// set voice title on dialog widget
	$dialog.dialog('widget').removeAttr('aria-labelledby')
	.attr('aria-label', me.event_date_text(event, true) + ', ', event.title);

	// set dialog size according to content
	me.dialog_resize($dialog.get(0), $dialog.height(), 420);

	// add link for "more options" drop-down
	if (!temp && !event.temporary && event.calendar != '_resource') {
	$('<a>')
	.attr('href', '#')
	.html(rcmail.gettext('eventoptions','calendar'))
	.addClass('dropdown-link')
	.click(function(e) {
	return rcmail.command('menu-open','eventoptionsmenu', this, e)
	})
	.appendTo($dialog.parent().find('.ui-dialog-buttonset'));
	}

	rcmail.enable_command('event-history', calendar.history)

	rcmail.triggerEvent('calendar-event-dialog', {dialog: $dialog});
	};

	// event handler for clicks on an attendee link
	var event_attendee_click = function(e)
	{
	var cutype = $(this).attr('data-cutype'),
	mailto = this.href.substr(7);
	if (rcmail.env.calendar_resources && cutype == 'RESOURCE') {
	event_resources_dialog(mailto);
	}
	else {
	rcmail.command('compose', mailto, e ? e.target : null, e);
	}
	return false;
	};

	// bring up the event dialog (jquery-ui popup)
	var event_edit_dialog = function(action, event)
	{
	// copy opener element from show dialog
	var op_elem = $("#eventshow:ui-dialog").data('opener');

	// close show dialog first
	$("#eventshow:ui-dialog").data('opener', null).dialog('close');

	var $dialog = $('<div>');
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:true, rights: action=='new' ? 'lrwitd' : 'lrs' };
	me.selected_event = $.extend($.extend({}, event_defaults), event); // clone event object (with defaults)
	event = me.selected_event; // change reference to clone
	freebusy_ui.needsupdate = false;

	// reset dialog first
	$('#eventtabs').get(0).reset();
	$('#event-panel-recurrence input, #event-panel-recurrence select, #event-panel-attachments input').prop('disabled', false);
	$('#event-panel-recurrence, #event-panel-attachments').removeClass('disabled');

	// allow other plugins to do actions when event form is opened
	rcmail.triggerEvent('calendar-event-init', {o: event});

	// event details
	var title = $('#edit-title').val(event.title \|\| '');
	var location = $('#edit-location').val(event.location \|\| '');
	var description = $('#edit-description').text(event.description \|\| '');
	var vurl = $('#edit-url').val(event.vurl \|\| '');
	var categories = $('#edit-categories').val(event.categories);
	var calendars = $('#edit-calendar').val(event.calendar);
	var eventstatus = $('#edit-event-status').val(event.status);
	var freebusy = $('#edit-free-busy').val(event.free_busy);
	var priority = $('#edit-priority').val(event.priority);
	var sensitivity = $('#edit-sensitivity').val(event.sensitivity);

	var duration = Math.round((event.end.getTime() - event.start.getTime()) / 1000);
	var startdate = $('#edit-startdate').val($.fullCalendar.formatDate(event.start, settings['date_format'])).data('duration', duration);
	var starttime = $('#edit-starttime').val($.fullCalendar.formatDate(event.start, settings['time_format'])).show();
	var enddate = $('#edit-enddate').val($.fullCalendar.formatDate(event.end, settings['date_format']));
	var endtime = $('#edit-endtime').val($.fullCalendar.formatDate(event.end, settings['time_format'])).show();
	var allday = $('#edit-allday').get(0);
	var notify = $('#edit-attendees-donotify').get(0);
	var invite = $('#edit-attendees-invite').get(0);
	var comment = $('#edit-attendees-comment');

	// make sure any calendar is selected
	if (!calendars.val())
	calendars.val($('option:first', calendars).attr('value'));

	invite.checked = settings.itip_notify & 1 > 0;
	notify.checked = has_attendees(event) && invite.checked;

	if (event.allDay) {
	starttime.val("12:00").hide();
	endtime.val("13:00").hide();
	allday.checked = true;
	}
	else {
	allday.checked = false;
	}

	// set calendar selection according to permissions
	calendars.find('option').each(function(i, opt) {
	var cal = me.calendars[opt.value] \|\| {};
	$(opt).prop('disabled', !(cal.editable \|\| (action == 'new' && has_permission(cal, 'i'))))
	});

	// set alarm(s)
	me.set_alarms_edit('#edit-alarms', action != 'new' && event.valarms && calendar.alarms ? event.valarms : []);

	// enable/disable alarm property according to backend support
	$('#edit-alarms')[(calendar.alarms ? 'show' : 'hide')]();

	// check categories drop-down: add value if not exists
	if (event.categories && !categories.find("option[value='"+event.categories+"']").length) {
	$('<option>').attr('value', event.categories).text(event.categories).appendTo(categories).prop('selected', true);
	}

	if ($.isArray(event.links) && event.links.length) {
	render_message_links(event.links, $('#edit-event-links .event-text'), true, 'calendar');
	$('#edit-event-links').show();
	}
	else {
	$('#edit-event-links').hide();
	}

	// show warning if editing a recurring event
	if (event.id && event.recurrence) {
	var sel = event._savemode \|\| (event.thisandfuture ? 'future' : (event.isexception ? 'current' : 'all'));
	$('#edit-recurring-warning').show();
	$('input.edit-recurring-savemode[value="'+sel+'"]').prop('checked', true).change();
	}
	else
	$('#edit-recurring-warning').hide();

	// init attendees tab
	var organizer = !event.attendees \|\| is_organizer(event),
	allow_invitations = organizer \|\| (calendar.owner && calendar.owner == 'anonymous') \|\| settings.invite_shared;
	event_attendees = [];
	attendees_list = $('#edit-attendees-table > tbody').html('');
	resources_list = $('#edit-resources-table > tbody').html('');
	$('#edit-attendees-notify')[(action != 'new' && allow_invitations && has_attendees(event) && (settings.itip_notify & 2) ? 'show' : 'hide')]();
	$('#edit-localchanges-warning')[(action != 'new' && has_attendees(event) && !(allow_invitations \|\| (calendar.owner && is_organizer(event, calendar.owner))) ? 'show' : 'hide')]();

	var load_attendees_tab = function()
	{
	var j, data, reply_selected = 0;
	if (event.attendees) {
	for (j=0; j < event.attendees.length; j++) {
	data = event.attendees[j];
	// reset attendee status
	if (event._savemode == 'new' && data.role != 'ORGANIZER') {
	data.status = 'NEEDS-ACTION';
	delete data.noreply;
	}
	add_attendee(data, !allow_invitations);
	if (allow_invitations && data.role != 'ORGANIZER' && !data.noreply)
	reply_selected++;
	}
	}

	// make sure comment box is visible if at least one attendee has reply enabled
	// or global "send invitations" checkbox is checked
	$('#eventedit .attendees-commentbox')[(reply_selected \|\| invite.checked ? 'show' : 'hide')]();

	// select the correct organizer identity
	var identity_id = 0;
	$.each(settings.identities, function(i,v){
	if (organizer && typeof organizer == 'object' && v == organizer.email) {
	identity_id = i;
	return false;
	}
	});
	$('#edit-identities-list').val(identity_id);
	$('#edit-attendees-form')[(allow_invitations?'show':'hide')]();
	$('#edit-attendee-schedule')[(calendar.freebusy?'show':'hide')]();
	};

	// attachments
	var load_attachments_tab = function()
	{
	rcmail.enable_command('remove-attachment', calendar.editable && !event.recurrence_id);
	rcmail.env.deleted_attachments = [];
	// we're sharing some code for uploads handling with app.js
	rcmail.env.attachments = [];
	rcmail.env.compose_id = event.id; // for rcmail.async_upload_form()

	if ($.isArray(event.attachments)) {
	event_show_attachments(event.attachments, $('#edit-attachments'), event, true);
	}
	else {
	$('#edit-attachments > ul').empty();
	// fetch attachments, some drivers doesn't set 'attachments' array for event?
	}
	};

	// init dialog buttons
	var buttons = [];

	// save action
	buttons.push({
	text: rcmail.gettext('save', 'calendar'),
	'class': 'mainaction',
	click: function() {
	var start = parse_datetime(allday.checked ? '12:00' : starttime.val(), startdate.val());
	var end = parse_datetime(allday.checked ? '13:00' : endtime.val(), enddate.val());

	// basic input validatetion
	if (start.getTime() > end.getTime()) {
	alert(rcmail.gettext('invalideventdates', 'calendar'));
	return false;
	}

	// post data to server
	var data = {
	calendar: event.calendar,
	start: date2servertime(start),
	end: date2servertime(end),
	allday: allday.checked?1:0,
	title: title.val(),
	description: description.val(),
	location: location.val(),
	categories: categories.val(),
	vurl: vurl.val(),
	free_busy: freebusy.val(),
	priority: priority.val(),
	sensitivity: sensitivity.val(),
	status: eventstatus.val(),
	recurrence: me.serialize_recurrence(endtime.val()),
	valarms: me.serialize_alarms('#edit-alarms'),
	attendees: event_attendees,
	links: me.selected_event.links,
	deleted_attachments: rcmail.env.deleted_attachments,
	attachments: []
	};

	// uploaded attachments list
	for (var i in rcmail.env.attachments)
	if (i.match(/^rcmfile(.+)/))
	data.attachments.push(RegExp.$1);

	// read attendee roles
	$('select.edit-attendee-role').each(function(i, elem){
	if (data.attendees[i])
	data.attendees[i].role = $(elem).val();
	});

	if (organizer)
	data._identity = $('#edit-identities-list option:selected').val();

	// per-attendee notification suppression
	var need_invitation = false;
	if (allow_invitations) {
	$.each(data.attendees, function (i, v) {
	if (v.role != 'ORGANIZER') {
	if ($('input.edit-attendee-reply[value="' + v.email + '"]').prop('checked') \|\| v.cutype == 'RESOURCE') {
	need_invitation = true;
	delete data.attendees[i]['noreply'];
	}
	else if (settings.itip_notify > 0) {
	data.attendees[i].noreply = 1;
	}
	}
	});
	}

	// tell server to send notifications
	if ((data.attendees.length \|\| (event.id && event.attendees.length)) && allow_invitations && (notify.checked \|\| invite.checked \|\| need_invitation)) {
	data._notify = settings.itip_notify;
	data._comment = comment.val();
	}

	data.calendar = calendars.val();

	if (event.id) {
	data.id = event.id;
	if (event.recurrence)
	data._savemode = $('input.edit-recurring-savemode:checked').val();
	if (data.calendar && data.calendar != event.calendar)
	data._fromcalendar = event.calendar;
	}

	update_event(action, data);
	$dialog.dialog("close");
	} // end click:
	});

	if (event.id) {
	buttons.push({
	text: rcmail.gettext('delete', 'calendar'),
	'class': 'delete',
	click: function() {
	me.delete_event(event);
	$dialog.dialog('close');
	}
	});
	}

	buttons.push({
	text: rcmail.gettext('cancel', 'calendar'),
	click: function() {
	$dialog.dialog("close");
	}
	});

	// show/hide tabs according to calendar's feature support
	$('#edit-tab-attendees')[(calendar.attendees?'show':'hide')]();
	$('#edit-tab-resources')[(rcmail.env.calendar_resources?'show':'hide')]();
	$('#edit-tab-attachments')[(calendar.attachments?'show':'hide')]();

	// activate the first tab
	$('#eventtabs').tabs('option', 'active', 0);

	// hack: set task to 'calendar' to make all dialog actions work correctly
	var comm_path_before = rcmail.env.comm_path;
	rcmail.env.comm_path = comm_path_before.replace(/_task=[a-z]+/, '_task=calendar');

	var editform = $("#eventedit");

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: (!bw.ie6 && !bw.ie7), // disable for performance reasons
	closeOnEscape: false,
	title: rcmail.gettext((action == 'edit' ? 'edit_event' : 'new_event'), 'calendar'),
	open: function() {
	editform.attr('aria-hidden', 'false');
	},
	close: function() {
	editform.hide().attr('aria-hidden', 'true').appendTo(document.body);
	$dialog.dialog("destroy").remove();
	rcmail.ksearch_blur();
	freebusy_data = {};
	rcmail.env.comm_path = comm_path_before; // restore comm_path
	if (op_elem)
	$(op_elem).focus();
	},
	buttons: buttons,
	minWidth: 500,
	width: 600
	}).append(editform.show()); // adding form content AFTERWARDS massively speeds up opening on IE6

	// set dialog size according to form content
	me.dialog_resize($dialog.get(0), editform.height() + (bw.ie ? 20 : 0), 550);

	title.select();

	// init other tabs asynchronously
	window.setTimeout(function(){ me.set_recurrence_edit(event); }, exec_deferred);
	if (calendar.attendees)
	window.setTimeout(load_attendees_tab, exec_deferred);
	if (calendar.attachments)
	window.setTimeout(load_attachments_tab, exec_deferred);

	rcmail.triggerEvent('calendar-event-dialog', {dialog: $dialog});
	};

	// show event changelog in a dialog
	var event_history_dialog = function(event)
	{
	if (!event.id \|\| !window.libkolab_audittrail)
	return false

	// render dialog
	var $dialog = libkolab_audittrail.object_history_dialog({
	module: 'calendar',
	container: '#eventhistory',
	title: rcmail.gettext('objectchangelog','calendar') + ' - ' + event.title + ', ' + me.event_date_text(event),

	// callback function for list actions
	listfunc: function(action, rev) {
	me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
	rcmail.http_post('event', { action:action, e:{ id:event.id, calendar:event.calendar, rev: rev } }, me.loading_lock);
	},

	// callback function for comparing two object revisions
	comparefunc: function(rev1, rev2) {
	me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
	rcmail.http_post('event', { action:'diff', e:{ id:event.id, calendar:event.calendar, rev1: rev1, rev2: rev2 } }, me.loading_lock);
	}
	});

	$dialog.data('event', event);

	// fetch changelog data
	me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
	rcmail.http_post('event', { action:'changelog', e:{ id:event.id, calendar:event.calendar } }, me.loading_lock);
	};

	// callback from server with changelog data
	var render_event_changelog = function(data)
	{
	var $dialog = $('#eventhistory'),
	event = $dialog.data('event');

	if (data === false \|\| !data.length \|\| !event) {
	// display 'unavailable' message
	$('<div class="notfound-message event-dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','calendar') + '</div>')
	.insertBefore($dialog.find('.changelog-table').hide());
	return;
	}

	data.module = 'calendar';
	libkolab_audittrail.render_changelog(data, event, me.calendars[event.calendar]);

	// set dialog size according to content
	me.dialog_resize($dialog.get(0), $dialog.height(), 600);
	};

	// callback from server with event diff data
	var event_show_diff = function(data)
	{
	var event = me.selected_event,
	$dialog = $("#eventdiff");

	$dialog.find('div.event-section, div.event-line, h1.event-title-new').hide().data('set', false).find('.index').html('');
	$dialog.find('div.event-section.clone, div.event-line.clone').remove();

	// always show event title and date
	$('.event-title', $dialog).text(event.title).removeClass('event-text-old').show();
	$('.event-date', $dialog).text(me.event_date_text(event)).show();

	// show each property change
	$.each(data.changes, function(i,change) {
	var prop = change.property, r2, html = false,
	row = $('div.event-' + prop, $dialog).first();

	// special case: title
	if (prop == 'title') {
	$('.event-title', $dialog).addClass('event-text-old').text(change['old'] \|\| '--');
	$('.event-title-new', $dialog).text(change['new'] \|\| '--').show();
	}

	// no display container for this property
	if (!row.length) {
	return true;
	}

	// clone row if already exists
	if (row.data('set')) {
	r2 = row.clone().addClass('clone').insertAfter(row);
	row = r2;
	}

	// format dates
	if (['start','end','changed'].indexOf(prop) >= 0) {
	if (change['old']) change.old_ = me.format_datetime(parseISO8601(change['old']));
	if (change['new']) change.new_ = me.format_datetime(parseISO8601(change['new']));
	}
	// render description text
	else if (prop == 'description') {
	// TODO: show real text diff
	if (!change.diff_ && change['old']) change.old_ = text2html(change['old']);
	if (!change.diff_ && change['new']) change.new_ = text2html(change['new']);
	html = true;
	}
	// format attendees struct
	else if (prop == 'attendees') {
	if (change['old']) change.old_ = rcube_libcalendaring.attendee_html(change['old']);
	if (change['new']) change.new_ = rcube_libcalendaring.attendee_html($.extend({}, change['old'] \|\| {}, change['new']));
	html = true;
	}
	// localize priority values
	else if (prop == 'priority') {
	var priolabels = [ '', rcmail.gettext('highest'), rcmail.gettext('high'), '', '', rcmail.gettext('normal'), '', '', rcmail.gettext('low'), rcmail.gettext('lowest') ];
	if (change['old']) change.old_ = change['old'] + ' ' + (priolabels[change['old']] \|\| '');
	if (change['new']) change.new_ = change['new'] + ' ' + (priolabels[change['new']] \|\| '');
	}
	// localize status
	else if (prop == 'status') {
	var status_lc = String(event.status).toLowerCase();
	if (change['old']) change.old_ = rcmail.gettext(String(change['old']).toLowerCase(), 'calendar');
	if (change['new']) change.new_ = rcmail.gettext(String(change['new']).toLowerCase(), 'calendar');
	}

	// format attachments struct
	if (prop == 'attachments') {
	if (change['old']) event_show_attachments([change['old']], row.children('.event-text-old'), event, false);
	else row.children('.event-text-old').text('--');
	if (change['new']) event_show_attachments([$.extend({}, change['old'] \|\| {}, change['new'])], row.children('.event-text-new'), event, false);
	else row.children('.event-text-new').text('--');
	// remove click handler as we're currentyl not able to display the according attachment contents
	$('.attachmentslist li a', row).unbind('click').removeAttr('href');
	}
	else if (change.diff_) {
	row.children('.event-text-diff').html(change.diff_);
	row.children('.event-text-old, .event-text-new').hide();
	}
	else {
	if (!html) {
	// escape HTML characters
	change.old_ = Q(change.old_ \|\| change['old'] \|\| '--')
	change.new_ = Q(change.new_ \|\| change['new'] \|\| '--')
	}
	row.children('.event-text-old').html(change.old_ \|\| change['old'] \|\| '--');
	row.children('.event-text-new').html(change.new_ \|\| change['new'] \|\| '--');
	}

	// display index number
	if (typeof change.index != 'undefined') {
	row.find('.index').html('(' + change.index + ')');
	}

	row.show().data('set', true);

	// hide event-date line
	if (prop == 'start' \|\| prop == 'end')
	$('.event-date', $dialog).hide();
	});

	var buttons = {};
	buttons[rcmail.gettext('close', 'calendar')] = function() {
	$dialog.dialog('close');
	};

	// open jquery UI dialog
	$dialog.dialog({
	modal: false,
	resizable: true,
	closeOnEscape: true,
	title: rcmail.gettext('objectdiff','calendar').replace('$rev1', data.rev1).replace('$rev2', data.rev2) + ' - ' + event.title,
	open: function() {
	$dialog.attr('aria-hidden', 'false');
	setTimeout(function(){
	$dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
	}, 5);
	},
	close: function() {
	$dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
	},
	buttons: buttons,
	minWidth: 320,
	width: 450
	}).show();

	// set dialog size according to content
	me.dialog_resize($dialog.get(0), $dialog.height(), 400);
	};

	// close the event history dialog
	var close_history_dialog = function()
	{
	$('#eventhistory, #eventdiff').each(function(i, elem) {
	var $dialog = $(elem);
	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');
	});
	}

	// exports
	this.event_show_diff = event_show_diff;
	this.event_show_dialog = event_show_dialog;
	this.event_history_dialog = event_history_dialog;
	this.render_event_changelog = render_event_changelog;
	this.close_history_dialog = close_history_dialog;

	// open a dialog to display detailed free-busy information and to find free slots
	var event_freebusy_dialog = function()
	{
	var $dialog = $('#eventfreebusy'),
	event = me.selected_event;

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	if (!event_attendees.length)
	return false;

	// set form elements
	var allday = $('#edit-allday').get(0);
	var duration = Math.round((event.end.getTime() - event.start.getTime()) / 1000);
	freebusy_ui.startdate = $('#schedule-startdate').val($.fullCalendar.formatDate(event.start, settings['date_format'])).data('duration', duration);
	freebusy_ui.starttime = $('#schedule-starttime').val($.fullCalendar.formatDate(event.start, settings['time_format'])).show();
	freebusy_ui.enddate = $('#schedule-enddate').val($.fullCalendar.formatDate(event.end, settings['date_format']));
	freebusy_ui.endtime = $('#schedule-endtime').val($.fullCalendar.formatDate(event.end, settings['time_format'])).show();

	if (allday.checked) {
	freebusy_ui.starttime.val("12:00").hide();
	freebusy_ui.endtime.val("13:00").hide();
	event.allDay = true;
	}

	// read attendee roles from drop-downs
	$('select.edit-attendee-role').each(function(i, elem){
	if (event_attendees[i])
	event_attendees[i].role = $(elem).val();
	});

	// render time slots
	var now = new Date(), fb_start = new Date(), fb_end = new Date();
	fb_start.setTime(event.start);
	fb_start.setHours(0); fb_start.setMinutes(0); fb_start.setSeconds(0); fb_start.setMilliseconds(0);
	fb_end.setTime(fb_start.getTime() + DAY_MS);

	freebusy_data = { required:{}, all:{} };
	freebusy_ui.loading = 1; // prevent render_freebusy_grid() to load data yet
	freebusy_ui.numdays = Math.max(allday.checked ? 14 : 1, Math.ceil(duration * 2 / 86400));
	freebusy_ui.interval = allday.checked ? 1440 : (60 / (settings.timeslots \|\| 1));
	freebusy_ui.start = fb_start;
	freebusy_ui.end = new Date(freebusy_ui.start.getTime() + DAY_MS * freebusy_ui.numdays);
	render_freebusy_grid(0);

	// render list of attendees
	freebusy_ui.attendees = {};
	var domid, dispname, data, role_html, list_html = '';
	for (var i=0; i < event_attendees.length; i++) {
	data = event_attendees[i];
	dispname = Q(data.name \|\| data.email);
	domid = String(data.email).replace(rcmail.identifier_expr, '');
	role_html = '<a class="attendee-role-toggle" id="rcmlia' + domid + '" title="' + Q(rcmail.gettext('togglerole', 'calendar')) + '"> </a>';
	list_html += '<div class="attendee ' + String(data.role).toLowerCase() + '" id="rcmli' + domid + '">' + role_html + dispname + '</div>';

	// clone attendees data for local modifications
	freebusy_ui.attendees[i] = freebusy_ui.attendees[domid] = $.extend({}, data);
	}

	// add total row
	list_html += '<div class="attendee spacer"> </div>';
	list_html += '<div class="attendee total">' + rcmail.gettext('reqallattendees','calendar') + '</div>';

	$('#schedule-attendees-list').html(list_html)
	.unbind('click.roleicons')
	.bind('click.roleicons', function(e){
	// toggle attendee status upon click on icon
	if (e.target.id && e.target.id.match(/rcmlia(.+)/)) {
	var attendee, domid = RegExp.$1,
	roles = [ 'REQ-PARTICIPANT', 'OPT-PARTICIPANT', 'NON-PARTICIPANT', 'CHAIR' ];
	if ((attendee = freebusy_ui.attendees[domid]) && attendee.role != 'ORGANIZER') {
	var req = attendee.role != 'OPT-PARTICIPANT' && attendee.role != 'NON-PARTICIPANT';
	var j = $.inArray(attendee.role, roles);
	j = (j+1) % roles.length;
	attendee.role = roles[j];
	$(e.target).parent().attr('class', 'attendee '+String(attendee.role).toLowerCase());

	// update total display if required-status changed
	if (req != (roles[j] != 'OPT-PARTICIPANT' && roles[j] != 'NON-PARTICIPANT')) {
	compute_freebusy_totals();
	update_freebusy_display(attendee.email);
	}
	}
	}

	return false;
	});

	// enable/disable buttons
	$('#shedule-find-prev').button('option', 'disabled', (fb_start.getTime() < now.getTime()));

	// dialog buttons
	var buttons = {};

	buttons[rcmail.gettext('select', 'calendar')] = function() {
	$('#edit-startdate').val(freebusy_ui.startdate.val());
	$('#edit-starttime').val(freebusy_ui.starttime.val());
	$('#edit-enddate').val(freebusy_ui.enddate.val());
	$('#edit-endtime').val(freebusy_ui.endtime.val());

	// write role changes back to main dialog
	$('select.edit-attendee-role').each(function(i, elem){
	if (event_attendees[i] && freebusy_ui.attendees[i]) {
	event_attendees[i].role = freebusy_ui.attendees[i].role;
	$(elem).val(event_attendees[i].role);
	}
	});

	if (freebusy_ui.needsupdate)
	update_freebusy_status(me.selected_event);
	freebusy_ui.needsupdate = false;
	$dialog.dialog("close");
	};

	buttons[rcmail.gettext('cancel', 'calendar')] = function() {
	$dialog.dialog("close");
	};

	$dialog.dialog({
	modal: true,
	resizable: true,
	closeOnEscape: (!bw.ie6 && !bw.ie7),
	title: rcmail.gettext('scheduletime', 'calendar'),
	open: function() {
	rcmail.ksearch_blur();
	$dialog.attr('aria-hidden', 'false').find('#shedule-find-next, #shedule-find-prev').not(':disabled').first().focus();
	},
	close: function() {
	if (bw.ie6)
	$("#edit-attendees-table").css('visibility','visible');
	$dialog.dialog("destroy").attr('aria-hidden', 'true').hide();
	// TODO: focus opener button
	},
	resizeStop: function() {
	render_freebusy_overlay();
	},
	buttons: buttons,
	minWidth: 640,
	width: 850
	}).show();

	// hide edit dialog on IE6 because of drop-down elements
	if (bw.ie6)
	$("#edit-attendees-table").css('visibility','hidden');

	// adjust dialog size to fit grid without scrolling
	var gridw = $('#schedule-freebusy-times').width();
	var overflow = gridw - $('#attendees-freebusy-table td.times').width();
	me.dialog_resize($dialog.get(0), $dialog.height() + (bw.ie ? 20 : 0), 800 + Math.max(0, overflow));

	// fetch data from server
	freebusy_ui.loading = 0;
	load_freebusy_data(freebusy_ui.start, freebusy_ui.interval);
	};

	// render an HTML table showing free-busy status for all the event attendees
	var render_freebusy_grid = function(delta)
	{
	if (delta) {
	freebusy_ui.start.setTime(freebusy_ui.start.getTime() + DAY_MS * delta);
	fix_date(freebusy_ui.start);

	// skip weekends if in workinhoursonly-mode
	if (Math.abs(delta) == 1 && freebusy_ui.workinhoursonly) {
	while (is_weekend(freebusy_ui.start))
	freebusy_ui.start.setTime(freebusy_ui.start.getTime() + DAY_MS * delta);
	fix_date(freebusy_ui.start);
	}

	freebusy_ui.end = new Date(freebusy_ui.start.getTime() + DAY_MS * freebusy_ui.numdays);
	}

	var dayslots = Math.floor(1440 / freebusy_ui.interval);
	var date_format = 'ddd '+ (dayslots <= 2 ? settings.date_short : settings.date_format);
	var lastdate, datestr, css,
	curdate = new Date(),
	allday = (freebusy_ui.interval == 1440),
	interval = allday ? 1440 : (freebusy_ui.interval * (settings.timeslots \|\| 1));
	times_css = (allday ? 'allday ' : ''),
	dates_row = '<tr class="dates">',
	times_row = '<tr class="times">',
	slots_row = '';

	for (var s = 0, t = freebusy_ui.start.getTime(); t < freebusy_ui.end.getTime(); s++) {
	curdate.setTime(t);
	datestr = fc.fullCalendar('formatDate', curdate, date_format);
	if (datestr != lastdate) {
	if (lastdate && !allday) break;
	dates_row += '<th colspan="' + dayslots + '" class="boxtitle date' + $.fullCalendar.formatDate(curdate, 'ddMMyyyy') + '">' + Q(datestr) + '</th>';
	lastdate = datestr;
	}

	// set css class according to working hours
	css = is_weekend(curdate) \|\| (freebusy_ui.interval <= 60 && !is_workinghour(curdate)) ? 'offhours' : 'workinghours';
	times_row += '<td class="' + times_css + css + '" id="t-' + Math.floor(t/1000) + '">' + Q(allday ? rcmail.gettext('all-day','calendar') : $.fullCalendar.formatDate(curdate, settings['time_format'])) + '</td>';
	slots_row += '<td class="' + css + '"> </td>';

	t += interval * 60000;
	}
	dates_row += '</tr>';
	times_row += '</tr>';

	// render list of attendees
	var domid, data, list_html = '', times_html = '';
	for (var i=0; i < event_attendees.length; i++) {
	data = event_attendees[i];
	domid = String(data.email).replace(rcmail.identifier_expr, '');
	times_html += '<tr id="fbrow' + domid + '">' + slots_row + '</tr>';
	}

	// add line for all/required attendees
	times_html += '<tr class="spacer"><td colspan="' + (dayslots * freebusy_ui.numdays) + '"></td>';
	times_html += '<tr id="fbrowall">' + slots_row + '</tr>';

	var table = $('#schedule-freebusy-times');
	table.children('thead').html(dates_row + times_row);
	table.children('tbody').html(times_html);

	// initialize event handlers on grid
	if (!freebusy_ui.grid_events) {
	freebusy_ui.grid_events = true;
	table.children('thead').click(function(e){
	// move event to the clicked date/time
	if (e.target.id && e.target.id.match(/t-(\d+)/)) {
	var newstart = new Date(RegExp.$1 * 1000);
	// set time to 00:00
	if (me.selected_event.allDay) {
	newstart.setMinutes(0);
	newstart.setHours(0);
	}
	update_freebusy_dates(newstart, new Date(newstart.getTime() + freebusy_ui.startdate.data('duration') * 1000));
	render_freebusy_overlay();
	}
	});
	}

	// if we have loaded free-busy data, show it
	if (!freebusy_ui.loading) {
	if (freebusy_ui.start < freebusy_data.start \|\| freebusy_ui.end > freebusy_data.end \|\| freebusy_ui.interval != freebusy_data.interval) {
	load_freebusy_data(freebusy_ui.start, freebusy_ui.interval);
	}
	else {
	for (var email, i=0; i < event_attendees.length; i++) {
	if ((email = event_attendees[i].email))
	update_freebusy_display(email);
	}
	}
	}

	// render current event date/time selection over grid table
	// use timeout to let the dom attributes (width/height/offset) be set first
	window.setTimeout(function(){ render_freebusy_overlay(); }, 10);
	};

	// render overlay element over the grid to visiualize the current event date/time
	var render_freebusy_overlay = function()
	{
	var overlay = $('#schedule-event-time');
	if (me.selected_event.end.getTime() <= freebusy_ui.start.getTime() \|\| me.selected_event.start.getTime() >= freebusy_ui.end.getTime()) {
	overlay.hide();
	if (overlay.data('isdraggable'))
	overlay.draggable('disable');
	}
	else {
	var i, n, table = $('#schedule-freebusy-times'),
	width = 0,
	pos = { top:table.children('thead').height(), left:0 },
	eventstart = date2unixtime(clone_date(me.selected_event.start, me.selected_event.allDay?1:0)),
	eventend = date2unixtime(clone_date(me.selected_event.end, me.selected_event.allDay?2:0)) - 60,
	slotstart = date2unixtime(freebusy_ui.start),
	slotsize = freebusy_ui.interval * 60,
	slotnum = freebusy_ui.interval > 60 ? 1 : (60 / freebusy_ui.interval),
	cells = table.children('thead').find('td'),
	cell_width = cells.first().get(0).offsetWidth,
	slotend;

	// iterate through slots to determine position and size of the overlay
	for (i=0; i < cells.length; i++) {
	for (n=0; n < slotnum; n++) {
	slotend = slotstart + slotsize - 1;
	// event starts in this slot: compute left
	if (eventstart >= slotstart && eventstart <= slotend) {
	pos.left = Math.round(i * cell_width + (cell_width / slotnum) * n);
	}
	// event ends in this slot: compute width
	if (eventend >= slotstart && eventend <= slotend) {
	width = Math.round(i * cell_width + (cell_width / slotnum) * (n + 1)) - pos.left;
	}
	slotstart += slotsize;
	}
	}

	if (!width)
	width = table.width() - pos.left;

	// overlay is visible
	if (width > 0) {
	overlay.css({ width: (width-4)+'px', height:(table.children('tbody').height() - 4)+'px', left:pos.left+'px', top:pos.top+'px' }).show();

	// configure draggable
	if (!overlay.data('isdraggable')) {
	overlay.draggable({
	axis: 'x',
	scroll: true,
	stop: function(e, ui){
	// convert pixels to time
	var px = ui.position.left;
	var range_p = $('#schedule-freebusy-times').width();
	var range_t = freebusy_ui.end.getTime() - freebusy_ui.start.getTime();
	var newstart = new Date(freebusy_ui.start.getTime() + px * (range_t / range_p));
	newstart.setSeconds(0); newstart.setMilliseconds(0);
	// snap to day boundaries
	if (me.selected_event.allDay) {
	if (newstart.getHours() >= 12) // snap to next day
	newstart.setTime(newstart.getTime() + DAY_MS);
	newstart.setMinutes(0);
	newstart.setHours(0);
	}
	else {
	// round to 5 minutes
	// @TODO: round to timeslots?
	var round = newstart.getMinutes() % 5;
	if (round > 2.5) newstart.setTime(newstart.getTime() + (5 - round) * 60000);
	else if (round > 0) newstart.setTime(newstart.getTime() - round * 60000);
	}
	// update event times and display
	update_freebusy_dates(newstart, new Date(newstart.getTime() + freebusy_ui.startdate.data('duration') * 1000));
	if (me.selected_event.allDay)
	render_freebusy_overlay();
	}
	}).data('isdraggable', true);
	}
	else
	overlay.draggable('enable');
	}
	else
	overlay.draggable('disable').hide();
	}
	};

	// fetch free-busy information for each attendee from server
	var load_freebusy_data = function(from, interval)
	{
	var start = new Date(from.getTime() - DAY_MS * 2); // start 2 days before event
	fix_date(start);
	var end = new Date(start.getTime() + DAY_MS * Math.max(14, freebusy_ui.numdays + 7)); // load min. 14 days
	freebusy_ui.numrequired = 0;
	freebusy_data.all = [];
	freebusy_data.required = [];

	// load free-busy information for every attendee
	var domid, email;
	for (var i=0; i < event_attendees.length; i++) {
	if ((email = event_attendees[i].email)) {
	domid = String(email).replace(rcmail.identifier_expr, '');
	$('#rcmli' + domid).addClass('loading');
	freebusy_ui.loading++;

	$.ajax({
	type: 'GET',
	dataType: 'json',
	url: rcmail.url('freebusy-times'),
	data: { email:email, start:date2servertime(clone_date(start, 1)), end:date2servertime(clone_date(end, 2)), interval:interval, _remote:1 },
	success: function(data) {
	freebusy_ui.loading--;

	// find attendee
	var i, attendee = null;
	for (i=0; i < event_attendees.length; i++) {
	if (freebusy_ui.attendees[i].email == data.email) {
	attendee = freebusy_ui.attendees[i];
	break;
	}
	}

	// copy data to member var
	var ts, status,
	req = attendee.role != 'OPT-PARTICIPANT',
	start = parseISO8601(data.start);

	freebusy_data.start = new Date(start);
	freebusy_data.end = parseISO8601(data.end);
	freebusy_data.interval = data.interval;
	freebusy_data[data.email] = {};

	for (i=0; i < data.slots.length; i++) {
	ts = date2timestring(start, data.interval > 60);
	status = data.slots.charAt(i);
	freebusy_data[data.email][ts] = status
	start = new Date(start.getTime() + data.interval * 60000);

	// set totals
	if (!freebusy_data.required[ts])
	freebusy_data.required[ts] = [0,0,0,0];
	if (req)
	freebusy_data.required[ts][status]++;

	if (!freebusy_data.all[ts])
	freebusy_data.all[ts] = [0,0,0,0];
	freebusy_data.all[ts][status]++;
	}

	// hide loading indicator
	var domid = String(data.email).replace(rcmail.identifier_expr, '');
	$('#rcmli' + domid).removeClass('loading');

	// update display
	update_freebusy_display(data.email);
	}
	});

	// count required attendees
	if (freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT')
	freebusy_ui.numrequired++;
	}
	}
	};

	// re-calculate total status after role change
	var compute_freebusy_totals = function()
	{
	freebusy_ui.numrequired = 0;
	freebusy_data.all = [];
	freebusy_data.required = [];

	var email, req, status;
	for (var i=0; i < event_attendees.length; i++) {
	if (!(email = event_attendees[i].email))
	continue;

	req = freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT';
	if (req)
	freebusy_ui.numrequired++;

	for (var ts in freebusy_data[email]) {
	if (!freebusy_data.required[ts])
	freebusy_data.required[ts] = [0,0,0,0];
	if (!freebusy_data.all[ts])
	freebusy_data.all[ts] = [0,0,0,0];

	status = freebusy_data[email][ts];
	freebusy_data.all[ts][status]++;

	if (req)
	freebusy_data.required[ts][status]++;
	}
	}
	};

	// update free-busy grid with status loaded from server
	var update_freebusy_display = function(email)
	{
	var status_classes = ['unknown','free','busy','tentative','out-of-office'];
	var domid = String(email).replace(rcmail.identifier_expr, '');
	var row = $('#fbrow' + domid);
	var rowall = $('#fbrowall').children();
	var dateonly = freebusy_ui.interval > 60,
	t, ts = date2timestring(freebusy_ui.start, dateonly),
	curdate = new Date(),
	fbdata = freebusy_data[email];

	if (fbdata && fbdata[ts] !== undefined && row.length) {
	t = freebusy_ui.start.getTime();
	row.children().each(function(i, cell) {
	var j, n, attr, last, all_slots = [], slots = [],
	all_cell = rowall.get(i),
	cnt = dateonly ? 1 : (60 / freebusy_ui.interval),
	percent = (100 / cnt);

	for (n=0; n < cnt; n++) {
	curdate.setTime(t);
	ts = date2timestring(curdate, dateonly);
	attr = {
	'style': 'float:left; width:' + percent.toFixed(2) + '%',
	'class': fbdata[ts] ? status_classes[fbdata[ts]] : 'unknown'
	};

	slots.push($('<div>').attr(attr));

	// also update total row if all data was loaded
	if (!freebusy_ui.loading && freebusy_data.all[ts] && all_cell) {
	var all_status = freebusy_data.all[ts][2] ? 'busy' : 'unknown',
	req_status = freebusy_data.required[ts][2] ? 'busy' : 'free';

	for (j=1; j < status_classes.length; j++) {
	if (freebusy_ui.numrequired && freebusy_data.required[ts][j] >= freebusy_ui.numrequired)
	req_status = status_classes[j];
	if (freebusy_data.all[ts][j] == event_attendees.length)
	all_status = status_classes[j];
	}

	attr['class'] = req_status + ' all-' + all_status;

	// these elements use some specific styling, so we want to minimize their number
	if (last && last.attr('class') == attr['class'])
	last.css('width', (percent + parseFloat(last.css('width').replace('%', ''))).toFixed(2) + '%');
	else {
	last = $('<div>').attr(attr);
	all_slots.push(last);
	}
	}

	t += freebusy_ui.interval * 60000;
	}

	$(cell).html('').append(slots);
	if (all_slots.length)
	$(all_cell).html('').append(all_slots);
	});
	}
	};

	// write changed event date/times back to form fields
	var update_freebusy_dates = function(start, end)
	{
	// fix all-day evebt times
	if (me.selected_event.allDay) {
	var numdays = Math.floor((me.selected_event.end.getTime() - me.selected_event.start.getTime()) / DAY_MS);
	start.setHours(12);
	start.setMinutes(0);
	end.setTime(start.getTime() + numdays * DAY_MS);
	end.setHours(13);
	end.setMinutes(0);
	}
	me.selected_event.start = start;
	me.selected_event.end = end;
	freebusy_ui.startdate.val($.fullCalendar.formatDate(start, settings['date_format']));
	freebusy_ui.starttime.val($.fullCalendar.formatDate(start, settings['time_format']));
	freebusy_ui.enddate.val($.fullCalendar.formatDate(end, settings['date_format']));
	freebusy_ui.endtime.val($.fullCalendar.formatDate(end, settings['time_format']));
	freebusy_ui.needsupdate = true;
	};

	// attempt to find a time slot where all attemdees are available
	var freebusy_find_slot = function(dir)
	{
	// exit if free-busy data isn't available yet
	if (!freebusy_data \|\| !freebusy_data.start)
	return false;

	var event = me.selected_event,
	eventstart = clone_date(event.start, event.allDay ? 1 : 0).getTime(), // calculate with integers
	eventend = clone_date(event.end, event.allDay ? 2 : 0).getTime(),
	duration = eventend - eventstart - (event.allDay ? HOUR_MS : 0), /* make sure we don't cross day borders on DST change */
	sinterval = freebusy_data.interval * 60000,
	intvlslots = 1,
	numslots = Math.ceil(duration / sinterval),
	fb_start = freebusy_data.start.getTime(),
	fb_end = freebusy_data.end.getTime(),
	checkdate, slotend, email, ts, slot, slotdate = new Date(),
	candidatecount = 0, candidatestart = false, success = false;

	// shift event times to next possible slot
	eventstart += sinterval * intvlslots * dir;
	eventend += sinterval * intvlslots * dir;

	// iterate through free-busy slots and find candidates
	for (slot = dir > 0 ? fb_start : fb_end - sinterval;
	(dir > 0 && slot < fb_end) \|\| (dir < 0 && slot >= fb_start);
	slot += sinterval * dir
	) {
	slotdate.setTime(slot);
	// fix slot if just crossed a DST change
	if (event.allDay) {
	fix_date(slotdate);
	slot = slotdate.getTime();
	}
	slotend = slot + sinterval;

	if ((dir > 0 && slotend <= eventstart) \|\| (dir < 0 && slot >= eventend)) // skip
	continue;

	// respect workinghours setting
	if (freebusy_ui.workinhoursonly) {
	if (is_weekend(slotdate) \|\| (freebusy_data.interval <= 60 && !is_workinghour(slotdate))) { // skip off-hours
	candidatestart = false;
	candidatecount = 0;
	continue;
	}
	}

	if (!candidatestart)
	candidatestart = slot;

	ts = date2timestring(slotdate, freebusy_data.interval > 60);

	// check freebusy data for all attendees
	for (var i=0; i < event_attendees.length; i++) {
	if (freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT' && (email = freebusy_ui.attendees[i].email) && freebusy_data[email] && freebusy_data[email][ts] > 1) {
	candidatestart = false;
	break;
	}
	}

	// occupied slot
	if (!candidatestart) {
	slot += Math.max(0, intvlslots - candidatecount - 1) * sinterval * dir;
	candidatecount = 0;
	continue;
	}
	else if (dir < 0)
	candidatestart = slot;

	candidatecount++;

	// if candidate is big enough, this is it!
	if (candidatecount == numslots) {
	event.start.setTime(candidatestart);
	event.end.setTime(candidatestart + duration);
	success = true;
	break;
	}
	}

	// update event date/time display
	if (success) {
	update_freebusy_dates(event.start, event.end);

	// move freebusy grid if necessary
	var offset = Math.ceil((event.start.getTime() - freebusy_ui.end.getTime()) / DAY_MS);
	if (event.start.getTime() >= freebusy_ui.end.getTime())
	render_freebusy_grid(Math.max(1, offset));
	else if (event.end.getTime() <= freebusy_ui.start.getTime())
	render_freebusy_grid(Math.min(-1, offset));
	else
	render_freebusy_overlay();

	var now = new Date();
	$('#shedule-find-prev').button('option', 'disabled', (event.start.getTime() < now.getTime()));

	// speak new selection
	rcmail.display_message(rcmail.gettext('suggestedslot', 'calendar') + ': ' + me.event_date_text(event, true), 'voice');
	}
	else {
	alert(rcmail.gettext('noslotfound','calendar'));
	}
	};

	// update event properties and attendees availability if event times have changed
	var event_times_changed = function()
	{
	if (me.selected_event) {
	var allday = $('#edit-allday').get(0);
	me.selected_event.allDay = allday.checked;
	me.selected_event.start = parse_datetime(allday.checked ? '12:00' : $('#edit-starttime').val(), $('#edit-startdate').val());
	me.selected_event.end = parse_datetime(allday.checked ? '13:00' : $('#edit-endtime').val(), $('#edit-enddate').val());
	if (event_attendees)
	freebusy_ui.needsupdate = true;
	$('#edit-startdate').data('duration', Math.round((me.selected_event.end.getTime() - me.selected_event.start.getTime()) / 1000));
	}
	};

	// add the given list of participants
	var add_attendees = function(names, params)
	{
	names = explode_quoted_string(names.replace(/,\s*$/, ''), ',');

	// parse name/email pairs
	var item, email, name, success = false;
	for (var i=0; i < names.length; i++) {
	email = name = '';
	item = $.trim(names[i]);

	if (!item.length) {
	continue;
	} // address in brackets without name (do nothing)
	else if (item.match(/^<[^@]+@[^>]+>$/)) {
	email = item.replace(/[<>]/g, '');
	} // address without brackets and without name (add brackets)
	else if (rcube_check_email(item)) {
	email = item;
	} // address with name
	else if (item.match(/([^\s<@]+@[^>]+)>*$/)) {
	email = RegExp.$1;
	name = item.replace(email, '').replace(/^["\s<>]+/, '').replace(/["\s<>]+$/, '');
	}
	if (email) {
	add_attendee($.extend({ email:email, name:name }, params));
	success = true;
	}
	else {
	alert(rcmail.gettext('noemailwarning'));
	}
	}

	return success;
	};

	// add the given attendee to the list
	var add_attendee = function(data, readonly, before)
	{
	if (!me.selected_event)
	return false;

	// check for dupes...
	var exists = false;
	$.each(event_attendees, function(i, v){ exists \|= (v.email == data.email); });
	if (exists)
	return false;

	var calendar = me.selected_event && me.calendars[me.selected_event.calendar] ? me.calendars[me.selected_event.calendar] : me.calendars[me.selected_calendar];

	var dispname = Q(data.name \|\| data.email);
	if (data.email)
	dispname = '<a href="mailto:' + data.email + '" title="' + Q(data.email) + '" class="mailtolink" data-cutype="' + data.cutype + '">' + dispname + '</a>';

	// role selection
	var organizer = data.role == 'ORGANIZER';
	var opts = {};
	if (organizer)
	opts.ORGANIZER = rcmail.gettext('calendar.roleorganizer');
	opts['REQ-PARTICIPANT'] = rcmail.gettext('calendar.rolerequired');
	opts['OPT-PARTICIPANT'] = rcmail.gettext('calendar.roleoptional');
	opts['NON-PARTICIPANT'] = rcmail.gettext('calendar.rolenonparticipant');

	if (data.cutype != 'RESOURCE')
	opts['CHAIR'] = rcmail.gettext('calendar.rolechair');

	if (organizer && !readonly)
	dispname = rcmail.env['identities-selector'];

	var select = '<select class="edit-attendee-role"' + (organizer \|\| readonly ? ' disabled="true"' : '') + ' aria-label="' + rcmail.gettext('role','calendar') + '">';
	for (var r in opts)
	select += '<option value="'+ r +'" class="' + r.toLowerCase() + '"' + (data.role == r ? ' selected="selected"' : '') +'>' + Q(opts[r]) + '</option>';
	select += '</select>';

	// availability
	var avail = data.email ? 'loading' : 'unknown';

	// delete icon
	var icon = rcmail.env.deleteicon ? '<img src="' + rcmail.env.deleteicon + '" alt="" />' : rcmail.gettext('delete');
	var dellink = '<a href="#delete" class="iconlink delete deletelink" title="' + Q(rcmail.gettext('delete')) + '">' + icon + '</a>';
	var tooltip = '', status = (data.status \|\| '').toLowerCase(),
	status_label = rcmail.gettext('status' + status, 'libcalendaring');

	// send invitation checkbox
	var invbox = '<input type="checkbox" class="edit-attendee-reply" value="' + Q(data.email) +'" title="' + Q(rcmail.gettext('calendar.sendinvitations')) + '" '
	+ (!data.noreply && settings.itip_notify & 1 ? 'checked="checked" ' : '') + '/>';

	if (data['delegated-to'])
	- tooltip = rcmail.gettext('delegatedto', 'calendar') + data['delegated-to'];
	+ tooltip = rcmail.gettext('libcalendaring.delegatedto') + ' ' + data['delegated-to'];
	else if (data['delegated-from'])
	- tooltip = rcmail.gettext('delegatedfrom', 'calendar') + data['delegated-from'];
	+ tooltip = rcmail.gettext('libcalendaring.delegatedfrom') + ' ' + data['delegated-from'];
	else if (status)
	tooltip = status_label;

	// add expand button for groups
	if (data.cutype == 'GROUP') {
	dispname += ' <a href="#expand" data-email="' + Q(data.email) + '" class="iconbutton add expandlink" title="' + rcmail.gettext('expandattendeegroup','libcalendaring') + '">' +
	rcmail.gettext('expandattendeegroup','libcalendaring') + '</a>';
	}

	var img_src = rcmail.assets_path('program/resources/blank.gif');
	var html = '<td class="role">' + select + '</td>' +
	'<td class="name"><span class="attendee-name">' + dispname + '</span></td>' +
	'<td class="availability"><img src="' + img_src + '" class="availabilityicon ' + avail + '" data-email="' + data.email + '" alt="" /></td>' +
	'<td class="confirmstate"><span class="' + status + '" title="' + Q(tooltip) + '">' + Q(status ? status_label : '') + '</span></td>' +
	(data.cutype != 'RESOURCE' ? '<td class="invite">' + (organizer \|\| readonly \|\| !invbox ? '' : invbox) + '</td>' : '') +
	'<td class="options">' + (organizer \|\| readonly ? '' : dellink) + '</td>';

	var table = rcmail.env.calendar_resources && data.cutype == 'RESOURCE' ? resources_list : attendees_list;
	var tr = $('<tr>')
	.addClass(String(data.role).toLowerCase())
	.html(html);

	if (before)
	tr.insertBefore(before)
	else
	tr.appendTo(table);

	tr.find('a.deletelink').click({ id:(data.email \|\| data.name) }, function(e) { remove_attendee(this, e.data.id); return false; });
	tr.find('a.mailtolink').click(event_attendee_click);
	tr.find('a.expandlink').click(data, function(e) { me.expand_attendee_group(e, add_attendee, remove_attendee); return false; });
	tr.find('input.edit-attendee-reply').click(function() {
	var enabled = $('#edit-attendees-invite:checked').length \|\| $('input.edit-attendee-reply:checked').length;
	$('#eventedit .attendees-commentbox')[enabled ? 'show' : 'hide']();
	});

	// select organizer identity
	if (data.identity_id)
	$('#edit-identities-list').val(data.identity_id);

	// check free-busy status
	if (avail == 'loading') {
	check_freebusy_status(tr.find('img.availabilityicon'), data.email, me.selected_event);
	}

	event_attendees.push(data);
	return true;
	};

	// iterate over all attendees and update their free-busy status display
	var update_freebusy_status = function(event)
	{
	attendees_list.find('img.availabilityicon').each(function(i,v) {
	var email, icon = $(this);
	if (email = icon.attr('data-email'))
	check_freebusy_status(icon, email, event);
	});

	freebusy_ui.needsupdate = false;
	};

	// load free-busy status from server and update icon accordingly
	var check_freebusy_status = function(icon, email, event)
	{
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { freebusy:false };
	if (!calendar.freebusy) {
	$(icon).attr('class', 'availabilityicon unknown');
	return;
	}

	icon = $(icon).attr('class', 'availabilityicon loading');

	$.ajax({
	type: 'GET',
	dataType: 'html',
	url: rcmail.url('freebusy-status'),
	data: { email:email, start:date2servertime(clone_date(event.start, event.allDay?1:0)), end:date2servertime(clone_date(event.end, event.allDay?2:0)), _remote: 1 },
	success: function(status){
	var avail = String(status).toLowerCase();
	icon.removeClass('loading').addClass(avail).attr('alt', rcmail.gettext('avail' + avail, 'calendar'));
	},
	error: function(){
	icon.removeClass('loading').addClass('unknown').attr('alt', rcmail.gettext('availunknown', 'calendar'));
	}
	});
	};

	// remove an attendee from the list
	var remove_attendee = function(elem, id)
	{
	$(elem).closest('tr').remove();
	event_attendees = $.grep(event_attendees, function(data){ return (data.name != id && data.email != id) });
	};

	// open a dialog to display detailed free-busy information and to find free slots
	var event_resources_dialog = function(search)
	{
	var $dialog = $('#eventresourcesdialog');

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	// dialog buttons
	var buttons = {};

	buttons[rcmail.gettext('addresource', 'calendar')] = function() {
	rcmail.command('add-resource');
	};

	buttons[rcmail.gettext('close')] = function() {
	$dialog.dialog("close");
	};

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: true,
	closeOnEscape: true,
	title: rcmail.gettext('findresources', 'calendar'),
	open: function() {
	rcmail.ksearch_blur();
	$dialog.attr('aria-hidden', 'false');
	},
	close: function() {
	$dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
	},
	resize: function(e) {
	var container = $(rcmail.gui_objects.resourceinfocalendar);
	container.fullCalendar('option', 'height', container.height() + 4);
	},
	buttons: buttons,
	width: 900,
	height: 500
	}).show();

	// define add-button as main action
	$('.ui-dialog-buttonset .ui-button', $dialog.parent()).first().addClass('mainaction').attr('id', 'rcmbtncalresadd');

	me.dialog_resize($dialog.get(0), 540, Math.min(1000, $(window).width() - 50));

	// set search query
	$('#resourcesearchbox').val(search \|\| '');

	// initialize the treelist widget
	if (!resources_treelist) {
	resources_treelist = new rcube_treelist_widget(rcmail.gui_objects.resourceslist, {
	id_prefix: 'rcres',
	id_encode: rcmail.html_identifier_encode,
	id_decode: rcmail.html_identifier_decode,
	selectable: true,
	save_state: true
	});
	resources_treelist.addEventListener('select', function(node) {
	if (resources_data[node.id]) {
	resource_showinfo(resources_data[node.id]);
	rcmail.enable_command('add-resource', me.selected_event && $("#eventedit").is(':visible') ? true : false);
	}
	else {
	rcmail.enable_command('add-resource', false);
	$(rcmail.gui_objects.resourceinfo).hide();
	$(rcmail.gui_objects.resourceownerinfo).hide();
	$(rcmail.gui_objects.resourceinfocalendar).fullCalendar('removeEventSource', resources_events_source);
	}
	});

	// fetch (all) resource data from server
	me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
	rcmail.http_request('resources-list', {}, me.loading_lock);

	// register button
	rcmail.register_button('add-resource', 'rcmbtncalresadd', 'uibutton');

	// initialize resource calendar display
	var resource_cal = $(rcmail.gui_objects.resourceinfocalendar);
	resource_cal.fullCalendar($.extend({}, fullcalendar_defaults, {
	header: { left: '', center: '', right: '' },
	height: resource_cal.height() + 4,
	defaultView: 'agendaWeek',
	eventSources: [],
	slotMinutes: 60,
	allDaySlot: false,
	eventRender: function(event, element, view) {
	var title = rcmail.get_label(event.status, 'calendar');
	element.addClass('status-' + event.status);
	element.find('.fc-event-head').hide();
	element.find('.fc-event-title').text(title);
	element.attr('aria-label', me.event_date_text(event, true) + ': ' + title);
	}
	}));

	$('#resource-calendar-prev').click(function(){
	resource_cal.fullCalendar('prev');
	return false;
	});
	$('#resource-calendar-next').click(function(){
	resource_cal.fullCalendar('next');
	return false;
	});
	}
	else if (search) {
	resource_search();
	}
	else {
	resource_render_list(resources_index);
	}

	if (me.selected_event && me.selected_event.start) {
	$(rcmail.gui_objects.resourceinfocalendar).fullCalendar('gotoDate', me.selected_event.start);
	}
	};

	// render the resource details UI box
	var resource_showinfo = function(resource)
	{
	// inline function to render a resource attribute
	function render_attrib(value) {
	if (typeof value == 'boolean') {
	return value ? rcmail.get_label('yes') : rcmail.get_label('no');
	}

	return value;
	}

	if (rcmail.gui_objects.resourceinfo) {
	var tr, table = $(rcmail.gui_objects.resourceinfo).show().find('tbody').html(''),
	attribs = $.extend({ name:resource.name }, resource.attributes\|\|{})
	attribs.description = resource.description;

	for (var k in attribs) {
	if (typeof attribs[k] == 'undefined')
	continue;
	table.append($('<tr>').addClass(k)
	.append('<td class="title">' + Q(ucfirst(rcmail.get_label(k, 'calendar'))) + '</td>')
	.append('<td class="value">' + text2html(render_attrib(attribs[k])) + '</td>')
	);
	}

	$(rcmail.gui_objects.resourceownerinfo).hide();
	$(rcmail.gui_objects.resourceinfocalendar).fullCalendar('removeEventSource', resources_events_source);

	if (resource.owner) {
	// display cached data
	if (resource_owners[resource.owner]) {
	resource_owner_load(resource_owners[resource.owner]);
	}
	else {
	// fetch owner data from server
	me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
	rcmail.http_request('resources-owner', { _id: resource.owner }, me.loading_lock);
	}
	}

	// load resource calendar
	resources_events_source.url = "./?_task=calendar&_action=resources-calendar&_id="+urlencode(resource.ID);
	$(rcmail.gui_objects.resourceinfocalendar).fullCalendar('addEventSource', resources_events_source);
	}
	};

	// callback from server for resource listing
	var resource_data_load = function(data)
	{
	var resources_tree = {};

	// store data by ID
	$.each(data, function(i, rec) {
	resources_data[rec.ID] = rec;

	// assign parent-relations
	if (rec.members) {
	$.each(rec.members, function(j, m){
	resources_tree[m] = rec.ID;
	});
	}
	});

	// walk the parent-child tree to determine the depth of each node
	$.each(data, function(i, rec) {
	rec._depth = 0;
	if (resources_tree[rec.ID])
	rec.parent_id = resources_tree[rec.ID];

	var parent_id = resources_tree[rec.ID];
	while (parent_id) {
	rec._depth++;
	parent_id = resources_tree[parent_id];
	}
	});

	// sort by depth, collection and name
	data.sort(function(a,b) {
	var j = a._type == 'collection' ? 1 : 0,
	k = b._type == 'collection' ? 1 : 0,
	d = a._depth - b._depth;
	if (!d) d = (k - j);
	if (!d) d = b.name < a.name ? 1 : -1;
	return d;
	});

	$.each(data, function(i, rec) {
	resources_index.push(rec.ID);
	});

	// apply search filter...
	if ($('#resourcesearchbox').val() != '')
	resource_search();
	else // ...or render full list
	resource_render_list(resources_index);

	rcmail.set_busy(false, null, me.loading_lock);
	};

	// renders the given list of resource records into the treelist
	var resource_render_list = function(index) {
	var rec, link;

	resources_treelist.reset();

	$.each(index, function(i, dn) {
	if (rec = resources_data[dn]) {
	link = $('<a>').attr('href', '#')
	.attr('rel', rec.ID)
	.html(Q(rec.name));

	resources_treelist.insert({ id:rec.ID, html:link, classes:[rec._type], collapsed:true }, rec.parent_id, false);
	}
	});
	};

	// callback from server for owner information display
	var resource_owner_load = function(data)
	{
	if (data) {
	// cache this!
	resource_owners[data.ID] = data;

	var table = $(rcmail.gui_objects.resourceownerinfo).find('tbody').html('');

	for (var k in data) {
	if (k == 'event' \|\| k == 'ID')
	continue;

	table.append($('<tr>').addClass(k)
	.append('<td class="title">' + Q(ucfirst(rcmail.get_label(k, 'calendar'))) + '</td>')
	.append('<td class="value">' + text2html(data[k]) + '</td>')
	);
	}

	table.parent().show();
	}
	}

	// quick-filter the loaded resource data
	var resource_search = function()
	{
	var dn, rec, dataset = [],
	q = $('#resourcesearchbox').val().toLowerCase();

	if (q.length && resources_data) {
	// search by iterating over all resource records
	for (dn in resources_data) {
	rec = resources_data[dn];
	if ((rec.name && String(rec.name).toLowerCase().indexOf(q) >= 0)
	\|\| (rec.email && String(rec.email).toLowerCase().indexOf(q) >= 0)
	\|\| (rec.description && String(rec.description).toLowerCase().indexOf(q) >= 0)
	) {
	dataset.push(rec.ID);
	}
	}

	resource_render_list(dataset);

	// select single match
	if (dataset.length == 1) {
	resources_treelist.select(dataset[0]);
	}
	}
	else {
	$('#resourcesearchbox').val('');
	}
	};

	//
	var reset_resource_search = function()
	{
	$('#resourcesearchbox').val('').focus();
	resource_render_list(resources_index);
	};

	//
	var add_resource2event = function()
	{
	var resource = resources_data[resources_treelist.get_selection()];
	if (resource) {
	if (add_attendee($.extend({ role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' }, resource)))
	rcmail.display_message(rcmail.get_label('resourceadded', 'calendar'), 'confirmation');
	}
	}

	// when the user accepts or declines an event invitation
	var event_rsvp = function(response, delegate, replymode)
	{
	var btn;
	if (typeof response == 'object') {
	btn = $(response);
	response = btn.attr('rel')
	}
	else {
	btn = $('#event-rsvp input.button[rel='+response+']');
	}

	// show menu to select rsvp reply mode (current or all)
	if (me.selected_event && me.selected_event.recurrence && !replymode) {
	rcube_libcalendaring.itip_rsvp_recurring(btn, function(resp, mode) {
	event_rsvp(resp, null, mode);
	});
	return;
	}

	if (me.selected_event && me.selected_event.attendees && response) {
	// bring up delegation dialog
	if (response == 'delegated' && !delegate) {
	rcube_libcalendaring.itip_delegate_dialog(function(data) {
	data.rsvp = data.rsvp ? 1 : '';
	event_rsvp('delegated', data, replymode);
	});
	return;
	}

	// update attendee status
	attendees = [];
	for (var data, i=0; i < me.selected_event.attendees.length; i++) {
	data = me.selected_event.attendees[i];
	if (settings.identity.emails.indexOf(';'+String(data.email).toLowerCase()) >= 0) {
	data.status = response.toUpperCase();
	data.rsvp = 0; // unset RSVP flag

	if (data.status == 'DELEGATED') {
	data['delegated-to'] = delegate.to;
	data.rsvp = delegate.rsvp
	}
	else {
	if (data['delegated-to']) {
	delete data['delegated-to'];
	if (data.role == 'NON-PARTICIPANT' && data.status != 'DECLINED')
	data.role = 'REQ-PARTICIPANT';
	}
	}

	attendees.push(i)
	}
	else if (response != 'DELEGATED' && data['delegated-from'] &&
	settings.identity.emails.indexOf(';'+String(data['delegated-from']).toLowerCase()) >= 0) {
	delete data['delegated-from'];
	}

	// set free_busy status to transparent if declined (#4425)
	if (data.status == 'DECLINED' \|\| data.role == 'NON-PARTICIPANT') {
	me.selected_event.free_busy = 'free';
	}
	else {
	me.selected_event.free_busy = 'busy';
	}
	}

	// submit status change to server
	var submit_data = $.extend({}, me.selected_event, { source:null, comment:$('#reply-comment-event-rsvp').val(), _savemode: replymode \|\| 'all' }, (delegate \|\| {})),
	noreply = $('#noreply-event-rsvp:checked').length ? 1 : 0;

	// import event from mail (temporary iTip event)
	if (submit_data._mbox && submit_data._uid) {
	me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
	rcmail.http_post('mailimportitip', {
	_mbox: submit_data._mbox,
	_uid: submit_data._uid,
	_part: submit_data._part,
	_status: response,
	_to: (delegate ? delegate.to : null),
	_rsvp: (delegate && delegate.rsvp) ? 1 : 0,
	_noreply: noreply,
	_comment: submit_data.comment,
	_instance: submit_data._instance,
	_savemode: submit_data._savemode
	});
	}
	else if (settings.invitation_calendars) {
	update_event('rsvp', submit_data, { status:response, noreply:noreply, attendees:attendees });
	}
	else {
	me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
	rcmail.http_post('event', { action:'rsvp', e:submit_data, status:response, attendees:attendees, noreply:noreply });
	}

	event_show_dialog(me.selected_event);
	}
	};

	// add the given date to the RDATE list
	var add_rdate = function(date)
	{
	var li = $('<li>')
	.attr('data-value', date2servertime(date))
	.html('<span>' + Q($.fullCalendar.formatDate(date, settings['date_format'])) + '</span>')
	.appendTo('#edit-recurrence-rdates');

	$('<a>').attr('href', '#del')
	.addClass('iconbutton delete')
	.html(rcmail.get_label('delete', 'calendar'))
	.attr('title', rcmail.get_label('delete', 'calendar'))
	.appendTo(li);
	};

	// re-sort the list items by their 'data-value' attribute
	var sort_rdates = function()
	{
	var mylist = $('#edit-recurrence-rdates'),
	listitems = mylist.children('li').get();
	listitems.sort(function(a, b) {
	var compA = $(a).attr('data-value');
	var compB = $(b).attr('data-value');
	return (compA < compB) ? -1 : (compA > compB) ? 1 : 0;
	})
	$.each(listitems, function(idx, item) { mylist.append(item); });
	}

	// remove the link reference matching the given uri
	function remove_link(elem)
	{
	var $elem = $(elem), uri = $elem.attr('data-uri');

	me.selected_event.links = $.grep(me.selected_event.links, function(link) { return link.uri != uri; });

	// remove UI list item
	$elem.hide().closest('li').addClass('deleted');
	}

	// post the given event data to server
	var update_event = function(action, data, add)
	{
	me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
	rcmail.http_post('calendar/event', $.extend({ action:action, e:data }, (add \|\| {})));

	// render event temporarily into the calendar
	if ((data.start && data.end) \|\| data.id) {
	var event = data.id ? $.extend(fc.fullCalendar('clientEvents', function(e){ return e.id == data.id; })[0], data) : data;
	if (data.start)
	event.start = data.start;
	if (data.end)
	event.end = data.end;
	if (data.allday !== undefined)
	event.allDay = data.allday;
	event.editable = false;
	event.temp = true;
	event.className = 'fc-event-cal-'+data.calendar+' fc-event-temp';
	fc.fullCalendar(data.id ? 'updateEvent' : 'renderEvent', event);

	// mark all recurring instances as temp
	if (event.recurrence \|\| event.recurrence_id) {
	var base_id = event.recurrence_id ? event.recurrence_id : String(event.id).replace(/-\d+(T\d{6})?$/, '');
	$.each(fc.fullCalendar('clientEvents', function(e){ return e.id == base_id \|\| e.recurrence_id == base_id; }), function(i,ev) {
	ev.temp = true;
	ev.editable = false;
	event.className += ' fc-event-temp';
	fc.fullCalendar('updateEvent', ev);
	});
	}
	}
	};

	// mouse-click handler to check if the show dialog is still open and prevent default action
	var dialog_check = function(e)
	{
	var showd = $("#eventshow");
	if (showd.is(':visible') && !$(e.target).closest('.ui-dialog').length && !$(e.target).closest('.popupmenu').length) {
	showd.dialog('close');
	e.stopImmediatePropagation();
	ignore_click = true;
	return false;
	}
	else if (ignore_click) {
	window.setTimeout(function(){ ignore_click = false; }, 20);
	return false;
	}
	return true;
	};

	// display confirm dialog when modifying/deleting an event
	var update_event_confirm = function(action, event, data)
	{
	// Allow other plugins to do actions here
	// E.g. when you move/resize the event init wasn't called
	// but we need it as some plugins may modify user identities
	// we depend on here (kolab_delegation)
	rcmail.triggerEvent('calendar-event-init', {o: event});

	if (!data) data = event;
	var decline = false, notify = false, html = '', cal = me.calendars[event.calendar],
	_has_attendees = has_attendees(event), _is_organizer = is_organizer(event);

	// event has attendees, ask whether to notify them
	if (_has_attendees) {
	var checked = (settings.itip_notify & 1 ? ' checked="checked"' : '');

	if (_is_organizer) {
	notify = true;
	if (settings.itip_notify & 2) {
	html += '<div class="message">' +
	'<label><input class="confirm-attendees-donotify" type="checkbox"' + checked + ' value="1" name="notify" /> ' +
	rcmail.gettext((action == 'remove' ? 'sendcancellation' : 'sendnotifications'), 'calendar') +
	'</label></div>';
	}
	else {
	data._notify = settings.itip_notify;
	}
	}
	else if (action == 'remove' && is_attendee(event)) {
	decline = true;
	checked = event.status != 'CANCELLED' ? checked : '';
	html += '<div class="message">' +
	'<label><input class="confirm-attendees-decline" type="checkbox"' + checked + ' value="1" name="decline" /> ' +
	rcmail.gettext('itipdeclineevent', 'calendar') +
	'</label></div>';
	}
	else {
	html += '<div class="message">' + rcmail.gettext('localchangeswarning', 'calendar') + '</div>';
	}
	}

	// recurring event: user needs to select the savemode
	if (event.recurrence) {
	var future_disabled = '', message_label = (action == 'remove' ? 'removerecurringeventwarning' : 'changerecurringeventwarning');

	// disable the 'future' savemode if I'm an attendee
	// reason: no calendaring system supports the thisandfuture range parameter in iTip REPLY
	if (action == 'remove' && _has_attendees && !_is_organizer && is_attendee(event)) {
	future_disabled = ' disabled';
	}

	html += '<div class="message"><span class="ui-icon ui-icon-alert"></span>' +
	rcmail.gettext(message_label, 'calendar') + '</div>' +
	'<div class="savemode">' +
	'<a href="#current" class="button">' + rcmail.gettext('currentevent', 'calendar') + '</a>' +
	'<a href="#future" class="button' + future_disabled + '">' + rcmail.gettext('futurevents', 'calendar') + '</a>' +
	'<a href="#all" class="button">' + rcmail.gettext('allevents', 'calendar') + '</a>' +
	(action != 'remove' ? '<a href="#new" class="button">' + rcmail.gettext('saveasnew', 'calendar') + '</a>' : '') +
	'</div>';
	}

	// show dialog
	if (html) {
	var $dialog = $('<div>').html(html);

	$dialog.find('a.button').button().filter(':not(.disabled)').click(function(e) {
	data._savemode = String(this.href).replace(/.+#/, '');
	data._notify = settings.itip_notify;

	// open event edit dialog when saving as new
	if (data._savemode == 'new') {
	event._savemode = 'new';
	event_edit_dialog('edit', event);
	fc.fullCalendar('refetchEvents');
	}
	else {
	if ($dialog.find('input.confirm-attendees-donotify').length)
	data._notify = $dialog.find('input.confirm-attendees-donotify').get(0).checked ? 1 : 0;
	if (decline) {
	data._decline = $dialog.find('input.confirm-attendees-decline:checked').length;
	data._notify = 0;
	}
	update_event(action, data);
	}

	$dialog.dialog("close");
	return false;
	});

	var buttons = [];

	if (!event.recurrence) {
	buttons.push({
	text: rcmail.gettext((action == 'remove' ? 'delete' : 'save'), 'calendar'),
	click: function() {
	data._notify = notify && $dialog.find('input.confirm-attendees-donotify:checked').length ? 1 : 0;
	data._decline = decline && $dialog.find('input.confirm-attendees-decline:checked').length ? 1 : 0;
	update_event(action, data);
	$(this).dialog("close");
	}
	});
	}

	buttons.push({
	text: rcmail.gettext('cancel', 'calendar'),
	click: function() {
	$(this).dialog("close");
	}
	});

	$dialog.dialog({
	modal: true,
	width: 460,
	dialogClass: 'warning',
	title: rcmail.gettext((action == 'remove' ? 'removeeventconfirm' : 'changeeventconfirm'), 'calendar'),
	buttons: buttons,
	open: function() {
	setTimeout(function(){
	$dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
	}, 5);
	},
	close: function(){
	$dialog.dialog("destroy").remove();
	if (!rcmail.busy)
	fc.fullCalendar('refetchEvents');
	}
	}).addClass('event-update-confirm').show();

	return false;
	}
	// show regular confirm box when deleting
	else if (action == 'remove' && !cal.undelete) {
	if (!confirm(rcmail.gettext('deleteventconfirm', 'calendar')))
	return false;
	}

	// do update
	update_event(action, data);

	return true;
	};

	var update_agenda_toolbar = function()
	{
	$('#agenda-listrange').val(fc.fullCalendar('option', 'listRange'));
	$('#agenda-listsections').val(fc.fullCalendar('option', 'listSections'));
	}


	/* public methods */

	/**
	* Remove saving lock and free the UI for new input
	*/
	this.unlock_saving = function()
	{
	if (me.saving_lock)
	rcmail.set_busy(false, null, me.saving_lock);
	};

	// opens calendar day-view in a popup
	this.fisheye_view = function(date)
	{
	$('#fish-eye-view:ui-dialog').dialog('close');

	// create list of active event sources
	var src, cals = {}, sources = [];
	for (var id in this.calendars) {
	src = $.extend({}, this.calendars[id]);
	src.editable = false;
	src.url = null;
	src.events = [];

	if (src.active) {
	cals[id] = src;
	sources.push(src);
	}
	}

	// copy events already loaded
	var events = fc.fullCalendar('clientEvents');
	for (var event, i=0; i< events.length; i++) {
	event = events[i];
	if (event.source && (src = cals[event.source.id])) {
	src.events.push(event);
	}
	}

	var h = $(window).height() - 50;
	var dialog = $('<div>')
	.attr('id', 'fish-eye-view')
	.dialog({
	modal: true,
	width: 680,
	height: h,
	title: $.fullCalendar.formatDate(date, 'dddd ' + settings['date_long']),
	close: function(){
	dialog.dialog("destroy");
	me.fisheye_date = null;
	}
	})
	.fullCalendar($.extend({}, fullcalendar_defaults, {
	defaultView: 'agendaDay',
	header: { left: '', center: '', right: '' },
	height: h - 50,
	date: date.getDate(),
	month: date.getMonth(),
	year: date.getFullYear(),
	eventSources: sources
	}));

	this.fisheye_date = date;
	};

	// opens the given calendar in a popup dialog
	this.quickview = function(id, shift)
	{
	var src, in_quickview = false;
	$.each(this.quickview_sources, function(i,cal) {
	if (cal.id == id) {
	in_quickview = true;
	src = cal;
	}
	});

	// remove source from quickview
	if (in_quickview && shift) {
	this.quickview_sources = $.grep(this.quickview_sources, function(src) { return src.id != id; });
	}
	else {
	if (!shift) {
	// remove all current quickview event sources
	if (this.quickview_active) {
	fc.fullCalendar('removeEventSources');
	}

	this.quickview_sources = [];

	// uncheck all active quickview icons
	calendars_list.container.find('div.focusview')
	.add('#calendars .searchresults div.focusview')
	.removeClass('focusview')
	.find('a.quickview').attr('aria-checked', 'false');
	}

	if (!in_quickview) {
	// clone and modify calendar properties
	src = $.extend({}, this.calendars[id]);
	src.url += '&_quickview=1';
	this.quickview_sources.push(src);
	}
	}

	// disable quickview
	if (this.quickview_active && !this.quickview_sources.length) {
	// register regular calendar event sources
	$.each(this.calendars, function(k, cal) {
	if (cal.active)
	fc.fullCalendar('addEventSource', cal);
	});

	this.quickview_active = false;
	$('body').removeClass('quickview-active');

	// uncheck all active quickview icons
	calendars_list.container.find('div.focusview')
	.add('#calendars .searchresults div.focusview')
	.removeClass('focusview')
	.find('a.quickview').attr('aria-checked', 'false');
	}
	// activate quickview
	else if (!this.quickview_active) {
	// remove regular calendar event sources
	fc.fullCalendar('removeEventSources');

	// register quickview event sources
	$.each(this.quickview_sources, function(i, src) {
	fc.fullCalendar('addEventSource', src);
	});

	this.quickview_active = true;
	$('body').addClass('quickview-active');
	}
	// update quickview sources
	else if (in_quickview) {
	fc.fullCalendar('removeEventSource', src);
	}
	else if (src) {
	fc.fullCalendar('addEventSource', src);
	}

	// activate quickview icon
	if (this.quickview_active) {
	$(calendars_list.get_item(id)).find('.calendar').first()
	.add('#calendars .searchresults .cal-' + id)
	[in_quickview ? 'removeClass' : 'addClass']('focusview')
	.find('a.quickview').attr('aria-checked', in_quickview ? 'false' : 'true');
	}
	};

	// disable quickview mode
	function reset_quickview()
	{
	// remove all current quickview event sources
	if (me.quickview_active) {
	fc.fullCalendar('removeEventSources');
	me.quickview_sources = [];
	}

	// register regular calendar event sources
	$.each(me.calendars, function(k, cal) {
	if (cal.active)
	fc.fullCalendar('addEventSource', cal);
	});

	// uncheck all active quickview icons
	calendars_list.container.find('div.focusview')
	.add('#calendars .searchresults div.focusview')
	.removeClass('focusview')
	.find('a.quickview').attr('aria-checked', 'false');

	me.quickview_active = false;
	$('body').removeClass('quickview-active');
	};

	//public method to show the print dialog.
	this.print_calendars = function(view)
	{
	if (!view) view = fc.fullCalendar('getView').name;
	var date = fc.fullCalendar('getDate') \|\| new Date();
	var range = fc.fullCalendar('option', 'listRange');
	var sections = fc.fullCalendar('option', 'listSections');
	rcmail.open_window(rcmail.url('print', { view: view, date: date2unixtime(date), range: range, sections: sections, search: this.search_query }), true, true);
	};

	// public method to bring up the new event dialog
	this.add_event = function(templ) {
	if (this.selected_calendar) {
	var now = new Date();
	var date = fc.fullCalendar('getDate');
	if (typeof date != 'Date')
	date = now;
	date.setHours(now.getHours()+1);
	date.setMinutes(0);
	var end = new Date(date.getTime());
	end.setHours(date.getHours()+1);
	event_edit_dialog('new', $.extend({ start:date, end:end, allDay:false, calendar:this.selected_calendar }, templ \|\| {}));
	}
	};

	// delete the given event after showing a confirmation dialog
	this.delete_event = function(event) {
	// show confirm dialog for recurring events, use jquery UI dialog
	return update_event_confirm('remove', event, { id:event.id, calendar:event.calendar, attendees:event.attendees });
	};

	// opens a jquery UI dialog with event properties (or empty for creating a new calendar)
	this.calendar_edit_dialog = function(calendar)
	{
	// close show dialog first
	var $dialog = $("#calendarform");
	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	if (!calendar)
	calendar = { name:'', color:'cc0000', editable:true, showalarms:true };

	var form, name, color, alarms;

	$dialog.html(rcmail.get_label('loading'));
	$.ajax({
	type: 'GET',
	dataType: 'html',
	url: rcmail.url('calendar'),
	data: { action:(calendar.id ? 'form-edit' : 'form-new'), c:{ id:calendar.id } },
	success: function(data) {
	$dialog.html(data);
	// resize and reposition dialog window
	form = $('#calendarpropform');
	me.dialog_resize('#calendarform', form.height(), form.width());
	name = $('#calendar-name').prop('disabled', !calendar.editable).val(calendar.editname \|\| calendar.name);
	color = $('#calendar-color').val(calendar.color).miniColors({ value: calendar.color, colorValues:rcmail.env.mscolors });
	alarms = $('#calendar-showalarms').prop('checked', calendar.showalarms).get(0);
	name.select();
	}
	});

	// dialog buttons
	var buttons = {};

	buttons[rcmail.gettext('save', 'calendar')] = function() {
	// form is not loaded
	if (!form \|\| !form.length)
	return;

	// TODO: do some input validation
	if (!name.val() \|\| name.val().length < 2) {
	alert(rcmail.gettext('invalidcalendarproperties', 'calendar'));
	name.select();
	return;
	}

	// post data to server
	var data = form.serializeJSON();
	if (data.color)
	data.color = data.color.replace(/^#/, '');
	if (calendar.id)
	data.id = calendar.id;
	if (alarms)
	data.showalarms = alarms.checked ? 1 : 0;

	me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
	rcmail.http_post('calendar', { action:(calendar.id ? 'edit' : 'new'), c:data });
	$dialog.dialog("close");
	};

	buttons[rcmail.gettext('cancel', 'calendar')] = function() {
	$dialog.dialog("close");
	};

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: true,
	closeOnEscape: false,
	title: rcmail.gettext((calendar.id ? 'editcalendar' : 'createcalendar'), 'calendar'),
	open: function() {
	$dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
	},
	close: function() {
	$dialog.html('').dialog("destroy").hide();
	},
	buttons: buttons,
	minWidth: 400,
	width: 420
	}).show();

	};

	this.calendar_remove = function(calendar)
	{
	this.calendar_destroy_source(calendar.id);
	rcmail.http_post('calendar', { action:'subscribe', c:{ id:calendar.id, active:0, permanent:0, recursive:1 } });
	return true;
	};

	this.calendar_delete = function(calendar)
	{
	if (confirm(rcmail.gettext(calendar.children ? 'deletecalendarconfirmrecursive' : 'deletecalendarconfirm', 'calendar'))) {
	rcmail.http_post('calendar', { action:'delete', c:{ id:calendar.id } });
	return true;
	}
	return false;
	};

	this.calendar_refresh_source = function(id)
	{
	// got race-conditions fc.currentFetchID when using refetchEvents,
	// so we remove and add the source instead
	// fc.fullCalendar('refetchEvents', me.calendars[id]);
	fc.fullCalendar('removeEventSource', me.calendars[id]);
	fc.fullCalendar('addEventSource', me.calendars[id]);
	};

	this.calendar_destroy_source = function(id)
	{
	var delete_ids = [];

	if (this.calendars[id]) {
	// find sub-calendars
	if (this.calendars[id].children) {
	for (var child_id in this.calendars) {
	if (String(child_id).indexOf(id) == 0)
	delete_ids.push(child_id);
	}
	}
	else {
	delete_ids.push(id);
	}
	}

	// delete all calendars in the list
	for (var i=0; i < delete_ids.length; i++) {
	id = delete_ids[i];
	calendars_list.remove(id);
	fc.fullCalendar('removeEventSource', this.calendars[id]);
	$('#edit-calendar option[value="'+id+'"]').remove();
	delete this.calendars[id];
	}
	};

	// open a dialog to upload an .ics file with events to be imported
	this.import_events = function(calendar)
	{
	// close show dialog first
	var $dialog = $("#eventsimport"),
	form = rcmail.gui_objects.importform;

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	if (calendar)
	$('#event-import-calendar').val(calendar.id);

	var buttons = {};
	buttons[rcmail.gettext('import', 'calendar')] = function() {
	if (form && form.elements._data.value) {
	rcmail.async_upload_form(form, 'import_events', function(e) {
	rcmail.set_busy(false, null, me.saving_lock);
	$('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');

	// display error message if no sophisticated response from server arrived (e.g. iframe load error)
	if (me.import_succeeded === null)
	rcmail.display_message(rcmail.get_label('importerror', 'calendar'), 'error');
	});

	// display upload indicator (with extended timeout)
	var timeout = rcmail.env.request_timeout;
	rcmail.env.request_timeout = 600;
	me.import_succeeded = null;
	me.saving_lock = rcmail.set_busy(true, 'uploading');
	$('.ui-dialog-buttonpane button', $dialog.parent()).button('disable');

	// restore settings
	rcmail.env.request_timeout = timeout;
	}
	};

	buttons[rcmail.gettext('cancel', 'calendar')] = function() {
	$dialog.dialog("close");
	};

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: false,
	closeOnEscape: false,
	title: rcmail.gettext('importevents', 'calendar'),
	open: function() {
	$dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
	},
	close: function() {
	$('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
	$dialog.dialog("destroy").hide();
	},
	buttons: buttons,
	width: 520
	}).show();
	};

	// callback from server if import succeeded
	this.import_success = function(p)
	{
	this.import_succeeded = true;
	$("#eventsimport:ui-dialog").dialog('close');
	rcmail.set_busy(false, null, me.saving_lock);
	rcmail.gui_objects.importform.reset();

	if (p.refetch)
	this.refresh(p);
	};

	// callback from server to report errors on import
	this.import_error = function(p)
	{
	this.import_succeeded = false;
	rcmail.set_busy(false, null, me.saving_lock);
	rcmail.display_message(p.message \|\| rcmail.get_label('importerror', 'calendar'), 'error');
	}

	// open a dialog to select calendars for export
	this.export_events = function(calendar)
	{
	// close show dialog first
	var $dialog = $("#eventsexport"),
	form = rcmail.gui_objects.exportform;

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	if (calendar)
	$('#event-export-calendar').val(calendar.id);

	$('#event-export-range').change(function(e){
	var custom = $('option:selected', this).val() == 'custom',
	input = $('#event-export-startdate')
	input.parent()[(custom?'show':'hide')]();
	if (custom)
	input.select();
	})

	var buttons = {};
	buttons[rcmail.gettext('export', 'calendar')] = function() {
	if (form) {
	var start = 0, range = $('#event-export-range option:selected', this).val(),
	source = $('#event-export-calendar option:selected').val(),
	attachmt = $('#event-export-attachments').get(0).checked;

	if (range == 'custom')
	start = date2unixtime(parse_datetime('00:00', $('#event-export-startdate').val()));
	else if (range > 0)
	start = 'today -' + range + ' months';

	rcmail.goto_url('export_events', { source:source, start:start, attachments:attachmt?1:0 });
	}
	$dialog.dialog("close");
	};

	buttons[rcmail.gettext('cancel', 'calendar')] = function() {
	$dialog.dialog("close");
	};

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: false,
	closeOnEscape: false,
	title: rcmail.gettext('exporttitle', 'calendar'),
	open: function() {
	$dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
	},
	close: function() {
	$('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
	$dialog.dialog("destroy").hide();
	},
	buttons: buttons,
	width: 520
	}).show();
	};

	// download the selected event as iCal
	this.event_download = function(event)
	{
	if (event && event.id) {
	rcmail.goto_url('export_events', { source:event.calendar, id:event.id, attachments:1 });
	}
	};

	// open the message compose step with a calendar_event parameter referencing the selected event.
	// the server-side plugin hook will pick that up and attach the event to the message.
	this.event_sendbymail = function(event, e)
	{
	if (event && event.id) {
	rcmail.command('compose', { _calendar_event:event._id }, e ? e.target : null, e);
	}
	};

	// display the edit dialog, request 'new' action and pass the selected event
	this.event_copy = function(event) {
	if (event && event.id) {
	var copy = $.extend(true, {}, event);

	delete copy.id;
	delete copy._id;
	delete copy.created;
	delete copy.changed;
	delete copy.recurrence_id;
	delete copy.attachments; // @TODO

	$.each(copy.attendees, function (k, v) {
	if (v.role != 'ORGANIZER') {
	v.status = 'NEEDS-ACTION';
	}
	})

	event_edit_dialog('new', copy);
	}
	};

	// show URL of the given calendar in a dialog box
	this.showurl = function(calendar)
	{
	var $dialog = $('#calendarurlbox');

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	if (calendar.feedurl) {
	if (calendar.caldavurl) {
	$('#caldavurl').val(calendar.caldavurl);
	$('#calendarcaldavurl').show();
	}
	else {
	$('#calendarcaldavurl').hide();
	}

	$dialog.dialog({
	resizable: true,
	closeOnEscape: true,
	title: rcmail.gettext('showurl', 'calendar'),
	close: function() {
	$dialog.dialog("destroy").hide();
	},
	width: 520
	}).show();

	$('#calfeedurl').val(calendar.feedurl).select();
	}
	};

	// refresh the calendar view after saving event data
	this.refresh = function(p)
	{
	var source = me.calendars[p.source];

	// helper function to update the given fullcalendar view
	function update_view(view, event, source) {
	var existing = view.fullCalendar('clientEvents', event._id);
	if (existing.length) {
	$.extend(existing[0], event);
	view.fullCalendar('updateEvent', existing[0]);
	// remove old recurrence instances
	if (event.recurrence && !event.recurrence_id)
	view.fullCalendar('removeEvents', function(e){ return e._id.indexOf(event._id+'-') == 0; });
	}
	else {
	event.source = source; // link with source
	view.fullCalendar('renderEvent', event);
	}
	}

	// remove temp events
	fc.fullCalendar('removeEvents', function(e){ return e.temp; });

	if (source && (p.refetch \|\| (p.update && !source.active))) {
	// activate event source if new event was added to an invisible calendar
	if (this.quickview_active) {
	// map source to the quickview_sources equivalent
	$.each(this.quickview_sources, function(src) {
	if (src.id == source.id) {
	source = src;
	return false;
	}
	});
	fc.fullCalendar('refetchEvents', source, true);
	}
	else if (!source.active) {
	source.active = true;
	fc.fullCalendar('addEventSource', source);
	$('#rcmlical' + source.id + ' input').prop('checked', true);
	}
	else
	fc.fullCalendar('refetchEvents', source, true);

	fetch_counts();
	}
	// add/update single event object
	else if (source && p.update) {
	var event = p.update;
	event.temp = false;
	event.editable = 0;

	// update fish-eye view
	if (this.fisheye_date)
	update_view($('#fish-eye-view'), event, source);

	// update main view
	event.editable = source.editable;
	update_view(fc, event, source);

	// update the currently displayed event dialog
	if ($('#eventshow').is(':visible') && me.selected_event && me.selected_event.id == event.id)
	event_show_dialog(event)
	}
	// refetch all calendars
	else if (p.refetch) {
	fc.fullCalendar('refetchEvents', undefined, true);
	fetch_counts();
	}
	};

	// modify query parameters for refresh requests
	this.before_refresh = function(query)
	{
	var view = fc.fullCalendar('getView');

	query.start = date2unixtime(view.visStart);
	query.end = date2unixtime(view.visEnd);

	if (this.search_query)
	query.q = this.search_query;

	return query;
	};

	// callback from server providing event counts
	this.update_counts = function(p)
	{
	$.each(p.counts, function(cal, count) {
	var li = calendars_list.get_item(cal),
	bubble = $(li).children('.calendar').find('span.count');

	if (!bubble.length && count > 0) {
	bubble = $('<span>')
	.addClass('count')
	.appendTo($(li).children('.calendar').first())
	}

	if (count > 0) {
	bubble.text(count).show();
	}
	else {
	bubble.text('').hide();
	}
	});
	};

	// callback after an iTip message event was imported
	this.itip_message_processed = function(data)
	{
	// remove temporary iTip source
	fc.fullCalendar('removeEventSource', this.calendars['--invitation--itip']);

	$('#eventshow:ui-dialog').dialog('close');
	this.selected_event = null;

	// refresh destination calendar source
	this.refresh({ source:data.calendar, refetch:true });

	this.unlock_saving();

	// process 'after_action' in mail task
	if (window.opener && window.opener.rcube_libcalendaring)
	window.opener.rcube_libcalendaring.itip_message_processed(data);
	};

	// reload the calendar view by keeping the current date/view selection
	this.reload_view = function()
	{
	var query = { view: fc.fullCalendar('getView').name },
	date = fc.fullCalendar('getDate');
	if (date)
	query.date = date2unixtime(date);
	rcmail.redirect(rcmail.url('', query));
	}

	// update browser location to remember current view
	this.update_state = function()
	{
	var query = { view: current_view },
	date = fc.fullCalendar('getDate');
	if (date)
	query.date = date2unixtime(date);

	if (window.history.replaceState)
	window.history.replaceState({}, document.title, rcmail.url('', query).replace('&_action=', ''));
	};

	this.resource_search = resource_search;
	this.reset_resource_search = reset_resource_search;
	this.add_resource2event = add_resource2event;
	this.resource_data_load = resource_data_load;
	this.resource_owner_load = resource_owner_load;


	/* event searching */

	// execute search
	this.quicksearch = function()
	{
	if (rcmail.gui_objects.qsearchbox) {
	var q = rcmail.gui_objects.qsearchbox.value;
	if (q != '') {
	var id = 'search-'+q;
	var sources = [];

	if (me.quickview_active)
	reset_quickview();

	if (this._search_message)
	rcmail.hide_message(this._search_message);

	for (var sid in this.calendars) {
	if (this.calendars[sid]) {
	this.calendars[sid].url = this.calendars[sid].url.replace(/&q=.+/, '') + '&q=' + urlencode(q);
	sources.push(sid);
	}
	}
	id += '@'+sources.join(',');

	// ignore if query didn't change
	if (this.search_request == id) {
	return;
	}
	// remember current view
	else if (!this.search_request) {
	this.default_view = fc.fullCalendar('getView').name;
	}

	this.search_request = id;
	this.search_query = q;

	// change to list view
	fc.fullCalendar('option', 'listSections', 'month')
	.fullCalendar('option', 'listRange', Math.max(60, settings['agenda_range']))
	.fullCalendar('changeView', 'table');

	update_agenda_toolbar();

	// refetch events with new url (if not already triggered by changeView)
	if (!this.is_loading)
	fc.fullCalendar('refetchEvents');
	}
	else // empty search input equals reset
	this.reset_quicksearch();
	}
	};

	// reset search and get back to normal event listing
	this.reset_quicksearch = function()
	{
	$(rcmail.gui_objects.qsearchbox).val('');

	if (this._search_message)
	rcmail.hide_message(this._search_message);

	if (this.search_request) {
	// hide bottom links of agenda view
	fc.find('.fc-list-content > .fc-listappend').hide();

	// restore original event sources and view mode from fullcalendar
	fc.fullCalendar('option', 'listSections', settings['agenda_sections'])
	.fullCalendar('option', 'listRange', settings['agenda_range']);

	update_agenda_toolbar();

	for (var sid in this.calendars) {
	if (this.calendars[sid])
	this.calendars[sid].url = this.calendars[sid].url.replace(/&q=.+/, '');
	}
	if (this.default_view)
	fc.fullCalendar('changeView', this.default_view);

	if (!this.is_loading)
	fc.fullCalendar('refetchEvents');

	this.search_request = this.search_query = null;
	}
	};

	// callback if all sources have been fetched from server
	this.events_loaded = function(count)
	{
	var addlinks, append = '';

	// enhance list view when searching
	if (this.search_request) {
	if (!count) {
	this._search_message = rcmail.display_message(rcmail.gettext('searchnoresults', 'calendar'), 'notice');
	append = '<div class="message">' + rcmail.gettext('searchnoresults', 'calendar') + '</div>';
	}
	append += '<div class="fc-bottomlinks formlinks"></div>';
	addlinks = true;
	}

	if (fc.fullCalendar('getView').name == 'table') {
	var container = fc.find('.fc-list-content > .fc-listappend');
	if (append) {
	if (!container.length)
	container = $('<div class="fc-listappend"></div>').appendTo(fc.find('.fc-list-content'));
	container.html(append).show();
	}
	else if (container.length)
	container.hide();

	// add links to adjust search date range
	if (addlinks) {
	var lc = container.find('.fc-bottomlinks');
	$('<a>').attr('href', '#').html(rcmail.gettext('searchearlierdates', 'calendar')).appendTo(lc).click(function(){
	fc.fullCalendar('incrementDate', 0, -1, 0);
	});
	lc.append(" ");
	$('<a>').attr('href', '#').html(rcmail.gettext('searchlaterdates', 'calendar')).appendTo(lc).click(function(){
	var range = fc.fullCalendar('option', 'listRange');
	if (range < 90) {
	fc.fullCalendar('option', 'listRange', fc.fullCalendar('option', 'listRange') + 30).fullCalendar('render');
	update_agenda_toolbar();
	}
	else
	fc.fullCalendar('incrementDate', 0, 1, 0);
	});
	}
	}

	if (this.fisheye_date)
	this.fisheye_view(this.fisheye_date);
	};

	// resize and reposition (center) the dialog window
	this.dialog_resize = function(id, height, width)
	{
	var win = $(window), w = win.width(), h = win.height();
	$(id).dialog('option', { height: Math.min(h-20, height+130), width: Math.min(w-20, width+50) });
	};

	// adjust calendar view size
	this.view_resize = function()
	{
	var footer = fc.fullCalendar('getView').name == 'table' ? $('#agendaoptions').outerHeight() : 0;
	fc.fullCalendar('option', 'height', $('#calendar').height() - footer);
	};

	// mark the given calendar folder as selected
	this.select_calendar = function(id, nolistupdate)
	{
	if (!nolistupdate)
	calendars_list.select(id);

	// trigger event hook
	rcmail.triggerEvent('selectfolder', { folder:id, prefix:'rcmlical' });

	this.selected_calendar = id;

	rcmail.update_state({source: id});
	};

	// register the given calendar to the current view
	var add_calendar_source = function(cal)
	{
	var color, brightness, select, id = cal.id;

	me.calendars[id] = $.extend({
	url: rcmail.url('calendar/load_events', { source: id }),
	className: 'fc-event-cal-'+id,
	id: id
	}, cal);

	// choose black text color when background is bright, white otherwise
	if (color = settings.event_coloring % 2 ? '' : '#' + cal.color) {
	if (/^#([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})$/i.test(color)) {
	// use information about brightness calculation found at
	// http://javascriptrules.com/2009/08/05/css-color-brightness-contrast-using-javascript/
	brightness = (parseInt(RegExp.$1, 16) * 299 + parseInt(RegExp.$2, 16) * 587 + parseInt(RegExp.$3, 16) * 114) / 1000;
	if (brightness > 125)
	me.calendars[id].textColor = 'black';
	}

	me.calendars[id].color = color;
	}

	if (fc && (cal.active \|\| cal.subscribed)) {
	if (cal.active)
	fc.fullCalendar('addEventSource', me.calendars[id]);

	var submit = { id: id, active: cal.active ? 1 : 0 };
	if (cal.subscribed !== undefined)
	submit.permanent = cal.subscribed ? 1 : 0;
	rcmail.http_post('calendar', { action:'subscribe', c:submit });
	}

	// insert to #calendar-select options if writeable
	select = $('#edit-calendar');
	if (fc && has_permission(cal, 'i') && select.length && !select.find('option[value="'+id+'"]').length) {
	$('<option>').attr('value', id).html(cal.name).appendTo(select);
	}
	}

	// fetch counts for some calendars from the server
	var fetch_counts = function()
	{
	if (count_sources.length) {
	setTimeout(function() {
	rcmail.http_request('calendar/count', { source:count_sources });
	}, 500);
	}
	};


	/* startup code */

	// create list of event sources AKA calendars
	var id, cal, active, event_sources = [];
	for (id in rcmail.env.calendars) {
	cal = rcmail.env.calendars[id];
	active = cal.active \|\| false;
	add_calendar_source(cal);

	// check active calendars
	$('#rcmlical'+id+' > .calendar input').prop('checked', active);

	if (active) {
	event_sources.push(this.calendars[id]);
	}
	if (cal.counts) {
	count_sources.push(id);
	}

	if (cal.editable && !this.selected_calendar) {
	this.selected_calendar = id;
	rcmail.enable_command('addevent', true);
	}
	}

	// initialize treelist widget that controls the calendars list
	var widget_class = window.kolab_folderlist \|\| rcube_treelist_widget;
	calendars_list = new widget_class(rcmail.gui_objects.calendarslist, {
	id_prefix: 'rcmlical',
	selectable: true,
	save_state: true,
	keyboard: false,
	searchbox: '#calendarlistsearch',
	search_action: 'calendar/calendar',
	search_sources: [ 'folders', 'users' ],
	search_title: rcmail.gettext('calsearchresults','calendar')
	});
	calendars_list.addEventListener('select', function(node) {
	if (node && node.id && me.calendars[node.id]) {
	me.select_calendar(node.id, true);
	rcmail.enable_command('calendar-edit', 'calendar-showurl', true);
	rcmail.enable_command('calendar-delete', me.calendars[node.id].editable);
	rcmail.enable_command('calendar-remove', me.calendars[node.id] && me.calendars[node.id].removable);
	}
	});
	calendars_list.addEventListener('insert-item', function(p) {
	var cal = p.data;
	if (cal && cal.id) {
	add_calendar_source(cal);

	// add css classes related to this calendar to document
	if (cal.css) {
	$('<style type="text/css"></style>')
	.html(cal.css)
	.appendTo('head');
	}
	}
	});
	calendars_list.addEventListener('subscribe', function(p) {
	var cal;
	if ((cal = me.calendars[p.id])) {
	cal.subscribed = p.subscribed \|\| false;
	rcmail.http_post('calendar', { action:'subscribe', c:{ id:p.id, active:cal.active?1:0, permanent:cal.subscribed?1:0 } });
	}
	});
	calendars_list.addEventListener('remove', function(p) {
	if (me.calendars[p.id] && me.calendars[p.id].removable) {
	me.calendar_remove(me.calendars[p.id]);
	}
	});
	calendars_list.addEventListener('search-complete', function(data) {
	if (data.length)
	rcmail.display_message(rcmail.gettext('nrcalendarsfound','calendar').replace('$nr', data.length), 'voice');
	else
	rcmail.display_message(rcmail.gettext('nocalendarsfound','calendar'), 'info');
	});
	calendars_list.addEventListener('click-item', function(event) {
	// handle clicks on quickview icon: temprarily add this source and open in quickview
	if ($(event.target).hasClass('quickview') && event.data) {
	if (!me.calendars[event.data.id]) {
	event.data.readonly = true;
	event.data.active = false;
	event.data.subscribed = false;
	add_calendar_source(event.data);
	}
	me.quickview(event.data.id, event.shiftKey \|\| event.metaKey \|\| event.ctrlKey);
	return false;
	}
	});

	// init (delegate) event handler on calendar list checkboxes
	$(rcmail.gui_objects.calendarslist).on('click', 'input[type=checkbox]', function(e) {
	e.stopPropagation();

	if (me.quickview_active) {
	this.checked = !this.checked;
	return false;
	}

	var id = this.value;
	if (me.calendars[id]) { // add or remove event source on click
	var action;
	if (this.checked) {
	action = 'addEventSource';
	me.calendars[id].active = true;
	}
	else {
	action = 'removeEventSource';
	me.calendars[id].active = false;
	}

	// adjust checked state of original list item
	if (calendars_list.is_search()) {
	calendars_list.container.find('input[value="'+id+'"]').prop('checked', this.checked);
	}

	// add/remove event source
	fc.fullCalendar(action, me.calendars[id]);
	rcmail.http_post('calendar', { action:'subscribe', c:{ id:id, active:me.calendars[id].active?1:0 } });
	}
	})
	.on('keypress', 'input[type=checkbox]', function(e) {
	// select calendar on <Enter>
	if (e.keyCode == 13) {
	calendars_list.select(this.value);
	return rcube_event.cancel(e);
	}
	})
	// init (delegate) event handler on quickview links
	.on('click', 'a.quickview', function(e) {
	var id = $(this).closest('li').attr('id').replace(/^rcmlical/, '');

	if (calendars_list.is_search())
	id = id.replace(/--xsR$/, '');

	if (me.calendars[id])
	me.quickview(id, e.shiftKey \|\| e.metaKey \|\| e.ctrlKey);

	if (!rcube_event.is_keyboard(e) && this.blur)
	this.blur();

	e.stopPropagation();
	return false;
	});

	// register dbl-click handler to open calendar edit dialog
	$(rcmail.gui_objects.calendarslist).on('dblclick', ':not(.virtual) > .calname', function(e){
	var id = $(this).closest('li').attr('id').replace(/^rcmlical/, '');
	me.calendar_edit_dialog(me.calendars[id]);
	});

	// select default calendar
	if (rcmail.env.source && this.calendars[rcmail.env.source])
	this.selected_calendar = rcmail.env.source;
	else if (settings.default_calendar && this.calendars[settings.default_calendar] && this.calendars[settings.default_calendar].editable)
	this.selected_calendar = settings.default_calendar;

	if (this.selected_calendar)
	this.select_calendar(this.selected_calendar);

	var viewdate = new Date();
	if (rcmail.env.date)
	viewdate.setTime(fromunixtime(rcmail.env.date));

	// add source with iTip event data for rendering
	if (rcmail.env.itip_events && rcmail.env.itip_events.length) {
	me.calendars['--invitation--itip'] = {
	events: rcmail.env.itip_events,
	className: 'fc-event-cal---invitation--itip',
	color: '#fff',
	textColor: '#333',
	editable: false,
	rights: 'lrs',
	attendees: true
	};
	event_sources.push(me.calendars['--invitation--itip']);
	}

	// initalize the fullCalendar plugin
	var fc = $('#calendar').fullCalendar($.extend({}, fullcalendar_defaults, {
	header: {
	right: 'prev,next today',
	center: 'title',
	left: 'agendaDay,agendaWeek,month,table'
	},
	date: viewdate.getDate(),
	month: viewdate.getMonth(),
	year: viewdate.getFullYear(),
	height: $('#calendar').height(),
	eventSources: event_sources,
	selectable: true,
	selectHelper: false,
	loading: function(isLoading) {
	me.is_loading = isLoading;
	this._rc_loading = rcmail.set_busy(isLoading, 'loading', this._rc_loading);
	// trigger callback
	if (!isLoading)
	me.events_loaded($(this).fullCalendar('clientEvents').length);
	},
	// callback for date range selection
	select: function(start, end, allDay, e, view) {
	var range_select = (!allDay \|\| start.getDate() != end.getDate())
	if (dialog_check(e) && range_select)
	event_edit_dialog('new', { start:start, end:end, allDay:allDay, calendar:me.selected_calendar });
	if (range_select \|\| ignore_click)
	view.calendar.unselect();
	},
	// callback for clicks in all-day box
	dayClick: function(date, allDay, e, view) {
	var now = new Date().getTime();
	if (now - day_clicked_ts < 400 && day_clicked == date.getTime()) { // emulate double-click on day
	var enddate = new Date(); enddate.setTime(date.getTime() + DAY_MS - 60000);
	return event_edit_dialog('new', { start:date, end:enddate, allDay:allDay, calendar:me.selected_calendar });
	}

	if (!ignore_click) {
	view.calendar.gotoDate(date);
	if (day_clicked && new Date(day_clicked).getMonth() != date.getMonth())
	view.calendar.select(date, date, allDay);
	}
	day_clicked = date.getTime();
	day_clicked_ts = now;
	},
	// callback when an event was dragged and finally dropped
	eventDrop: function(event, dayDelta, minuteDelta, allDay, revertFunc) {
	if (event.end == null \|\| event.end.getTime() < event.start.getTime()) {
	event.end = new Date(event.start.getTime() + (allDay ? DAY_MS : HOUR_MS));
	}
	// moved to all-day section: set times to 12:00 - 13:00
	if (allDay && !event.allDay) {
	event.start.setHours(12);
	event.start.setMinutes(0);
	event.start.setSeconds(0);
	event.end.setHours(13);
	event.end.setMinutes(0);
	event.end.setSeconds(0);
	}
	// moved from all-day section: set times to working hours
	else if (event.allDay && !allDay) {
	var newstart = event.start.getTime();
	revertFunc(); // revert to get original duration
	var numdays = Math.max(1, Math.round((event.end.getTime() - event.start.getTime()) / DAY_MS)) - 1;
	event.start = new Date(newstart);
	event.end = new Date(newstart + numdays * DAY_MS);
	event.end.setHours(settings['work_end'] \|\| 18);
	event.end.setMinutes(0);

	if (event.end.getTime() < event.start.getTime())
	event.end = new Date(newstart + HOUR_MS);
	}

	// send move request to server
	var data = {
	id: event.id,
	calendar: event.calendar,
	start: date2servertime(event.start),
	end: date2servertime(event.end),
	allday: allDay?1:0
	};
	update_event_confirm('move', event, data);
	},
	// callback for event resizing
	eventResize: function(event, delta) {
	// sanitize event dates
	if (event.allDay)
	event.start.setHours(12);
	if (!event.end \|\| event.end.getTime() < event.start.getTime())
	event.end = new Date(event.start.getTime() + HOUR_MS);

	// send resize request to server
	var data = {
	id: event.id,
	calendar: event.calendar,
	start: date2servertime(event.start),
	end: date2servertime(event.end)
	};
	update_event_confirm('resize', event, data);
	},
	viewDisplay: function(view) {
	$('#agendaoptions')[view.name == 'table' ? 'show' : 'hide']();
	if (minical) {
	window.setTimeout(function(){ minical.datepicker('setDate', fc.fullCalendar('getDate')); }, exec_deferred);
	if (view.name != current_view)
	me.view_resize();
	current_view = view.name;
	me.update_state();
	}
	},
	viewRender: function(view) {
	if (fc && view.name == 'month')
	fc.fullCalendar('option', 'maxHeight', Math.floor((view.element.parent().height()-18) / 6) - 35);
	}
	}));

	// if start date is changed, shift end date according to initial duration
	var shift_enddate = function(dateText) {
	var newstart = parse_datetime('0', dateText);
	var newend = new Date(newstart.getTime() + $('#edit-startdate').data('duration') * 1000);
	$('#edit-enddate').val($.fullCalendar.formatDate(newend, me.settings['date_format']));
	event_times_changed();
	};

	// Set as calculateWeek to determine the week of the year based on the ISO 8601 definition.
	// Uses the default $.datepicker.iso8601Week() function but takes firstDay setting into account.
	// This is a temporary fix until http://bugs.jqueryui.com/ticket/8420 is resolved.
	var iso8601Week = datepicker_settings.calculateWeek = function(date) {
	var mondayOffset = Math.abs(1 - datepicker_settings.firstDay);
	return $.datepicker.iso8601Week(new Date(date.getTime() + mondayOffset * 86400000));
	};

	var minical;
	var init_calendar_ui = function()
	{
	// initialize small calendar widget using jQuery UI datepicker
	minical = $('#datepicker').datepicker($.extend(datepicker_settings, {
	inline: true,
	showWeek: true,
	changeMonth: true,
	changeYear: true,
	onSelect: function(dateText, inst) {
	ignore_click = true;
	var d = minical.datepicker('getDate'); //parse_datetime('0:0', dateText);
	fc.fullCalendar('gotoDate', d).fullCalendar('select', d, d, true);
	},
	onChangeMonthYear: function(year, month, inst) {
	minical.data('year', year).data('month', month);
	},
	beforeShowDay: function(date) {
	var view = fc.fullCalendar('getView');
	var active = view.visStart && date.getTime() >= view.visStart.getTime() && date.getTime() < view.visEnd.getTime();
	return [ true, (active ? 'ui-datepicker-activerange ui-datepicker-active-' + view.name : ''), ''];
	}
	})) // set event handler for clicks on calendar week cell of the datepicker widget
	.on('click', 'td.ui-datepicker-week-col', function(e) {
	var cell = $(e.target);
	if (e.target.tagName == 'TD') {
	var base_date = minical.datepicker('getDate');
	if (minical.data('month'))
	base_date.setMonth(minical.data('month')-1);
	if (minical.data('year'))
	base_date.setYear(minical.data('year'));
	base_date.setHours(12);
	base_date.setDate(base_date.getDate() - ((base_date.getDay() + 6) % 7) + datepicker_settings.firstDay);
	var base_kw = iso8601Week(base_date),
	target_kw = parseInt(cell.html()),
	wdiff = target_kw - base_kw;
	if (wdiff > 10) // year jump
	base_date.setYear(base_date.getFullYear() - 1);
	else if (wdiff < -10)
	base_date.setYear(base_date.getFullYear() + 1);
	// select monday of the chosen calendar week
	var day_off = base_date.getDay() - datepicker_settings.firstDay,
	date = new Date(base_date.getTime() - day_off * DAY_MS + wdiff * 7 * DAY_MS);
	fc.fullCalendar('gotoDate', date).fullCalendar('setDate', date).fullCalendar('changeView', 'agendaWeek');
	minical.datepicker('setDate', date);
	}
	});

	minical.find('.ui-datepicker-inline').attr('aria-labelledby', 'aria-label-minical');

	if (rcmail.env.date) {
	var viewdate = new Date();
	viewdate.setTime(fromunixtime(rcmail.env.date));
	minical.datepicker('setDate', viewdate);
	}

	// init event dialog
	$('#eventtabs').tabs({
	activate: function(event, ui) {
	// newPanel.selector for jQuery-UI 1.10, newPanel.attr('id') for jQuery-UI 1.12
	var tab = String(ui.newPanel.selector \|\| ui.newPanel.attr('id'))
	.replace(/^#?event-panel-/, '').replace(/s$/, '');

	if (tab == 'attendee' \|\| tab == 'resource') {
	if (!rcube_event.is_keyboard(event))
	$('#edit-'+tab+'-name').select();
	// update free-busy status if needed
	if (freebusy_ui.needsupdate && me.selected_event)
	update_freebusy_status(me.selected_event);
	// add current user as organizer if non added yet
	if (tab == 'attendee' && !event_attendees.length) {
	add_attendee($.extend({ role:'ORGANIZER' }, settings.identity));
	$('#edit-attendees-form .attendees-invitebox').show();
	}
	}
	// reset autocompletion on tab change (#3389)
	rcmail.ksearch_blur();
	}
	});
	$('#edit-enddate').datepicker(datepicker_settings);
	$('#edit-startdate').datepicker(datepicker_settings).datepicker('option', 'onSelect', shift_enddate).change(function(){ shift_enddate(this.value); });
	$('#edit-enddate').datepicker('option', 'onSelect', event_times_changed).change(event_times_changed);
	$('#edit-allday').click(function(){ $('#edit-starttime, #edit-endtime')[(this.checked?'hide':'show')](); event_times_changed(); });

	// configure drop-down menu on time input fields based on jquery UI autocomplete
	$('#edit-starttime, #edit-endtime, #eventedit input.edit-alarm-time').each(function() {
	me.init_time_autocomplete(this, {
	container: '#eventedit',
	change: event_times_changed
	});
	});

	// adjust end time when changing start
	$('#edit-starttime').change(function(e) {
	var dstart = $('#edit-startdate'),
	newstart = parse_datetime(this.value, dstart.val()),
	newend = new Date(newstart.getTime() + dstart.data('duration') * 1000);
	$('#edit-endtime').val($.fullCalendar.formatDate(newend, me.settings['time_format']));
	$('#edit-enddate').val($.fullCalendar.formatDate(newend, me.settings['date_format']));
	event_times_changed();
	});

	// register events on alarms and recurrence fields
	me.init_alarms_edit('#edit-alarms');
	me.init_recurrence_edit('#eventedit');

	// reload free-busy status when changing the organizer identity
	$('#eventedit').on('change', '#edit-identities-list', function(e) {
	var email = settings.identities[$(this).val()],
	icon = $(this).closest('tr').find('img.availabilityicon');

	if (email && icon.length) {
	icon.attr('data-email', email);
	check_freebusy_status(icon, email, me.selected_event);
	}
	});

	$('#event-export-startdate').datepicker(datepicker_settings);

	// init attendees autocompletion
	var ac_props;
	// parallel autocompletion
	if (rcmail.env.autocomplete_threads > 0) {
	ac_props = {
	threads: rcmail.env.autocomplete_threads,
	sources: rcmail.env.autocomplete_sources
	};
	}
	rcmail.init_address_input_events($('#edit-attendee-name'), ac_props);
	rcmail.addEventListener('autocomplete_insert', function(e) {
	var success = false;
	if (e.field.name == 'participant') {
	success = add_attendees(e.insert, { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:(e.data && e.data.type == 'group' ? 'GROUP' : 'INDIVIDUAL') });
	}
	else if (e.field.name == 'resource' && e.data && e.data.email) {
	success = add_attendee($.extend(e.data, { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' }));
	}
	if (e.field && success) {
	e.field.value = '';
	}
	});

	$('#edit-attendee-add').click(function(){
	var input = $('#edit-attendee-name');
	rcmail.ksearch_blur();
	if (add_attendees(input.val(), { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'INDIVIDUAL' })) {
	input.val('');
	}
	});

	rcmail.init_address_input_events($('#edit-resource-name'), { action:'calendar/resources-autocomplete' });

	$('#edit-resource-add').click(function(){
	var input = $('#edit-resource-name');
	rcmail.ksearch_blur();
	if (add_attendees(input.val(), { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' })) {
	input.val('');
	}
	});

	$('#edit-resource-find').click(function(){
	event_resources_dialog();
	return false;
	});

	// handle change of "send invitations" checkbox
	$('#edit-attendees-invite').change(function() {
	$('#edit-attendees-donotify,input.edit-attendee-reply').prop('checked', this.checked);
	// hide/show comment field
	$('#eventedit .attendees-commentbox')[this.checked ? 'show' : 'hide']();
	});

	// delegate change event to "send invitations" checkbox
	$('#edit-attendees-donotify').change(function() {
	$('#edit-attendees-invite').click();
	return false;
	});

	$('#edit-attendee-schedule').click(function(){
	event_freebusy_dialog();
	});

	$('#shedule-freebusy-prev').html(bw.ie6 ? '<<' : '◄').button().click(function(){ render_freebusy_grid(-1); });
	$('#shedule-freebusy-next').html(bw.ie6 ? '>>' : '►').button().click(function(){ render_freebusy_grid(1); }).parent().buttonset();

	$('#shedule-find-prev').button().click(function(){ freebusy_find_slot(-1); });
	$('#shedule-find-next').button().click(function(){ freebusy_find_slot(1); });

	$('#schedule-freebusy-workinghours').click(function(){
	freebusy_ui.workinhoursonly = this.checked;
	$('#workinghourscss').remove();
	if (this.checked)
	$('<style type="text/css" id="workinghourscss"> td.offhours { opacity:0.3; filter:alpha(opacity=30) } </style>').appendTo('head');
	});

	$('#event-rsvp input.button').click(function(e) {
	event_rsvp(this)
	});

	$('#eventedit input.edit-recurring-savemode').change(function(e) {
	var sel = $('input.edit-recurring-savemode:checked').val(),
	disabled = sel == 'current' \|\| sel == 'future';
	$('#event-panel-recurrence input, #event-panel-recurrence select, #event-panel-attachments input').prop('disabled', disabled);
	$('#event-panel-recurrence, #event-panel-attachments')[(disabled?'addClass':'removeClass')]('disabled');
	})

	$('#eventshow .changersvp').click(function(e) {
	var d = $('#eventshow'),
	h = -$(this).closest('.event-line').toggle().height();
	$('#event-rsvp').slideDown(300, function() {
	h += $(this).height();
	me.dialog_resize(d.get(0), d.height() + h, d.outerWidth() - 50);
	});
	return false;
	})

	// register click handler for message links
	$('#edit-event-links, #event-links').on('click', 'li a.messagelink', function(e) {
	rcmail.open_window(this.href);
	if (!rcube_event.is_keyboard(e) && this.blur)
	this.blur();
	return false;
	});

	// register click handler for message delete buttons
	$('#edit-event-links').on('click', 'li a.delete', function(e) {
	remove_link(e.target);
	return false;
	});

	$('#agenda-listrange').change(function(e){
	settings['agenda_range'] = parseInt($(this).val());
	fc.fullCalendar('option', 'listRange', settings['agenda_range']).fullCalendar('render');
	// TODO: save new settings in prefs
	}).val(settings['agenda_range']);

	$('#agenda-listsections').change(function(e){
	settings['agenda_sections'] = $(this).val();
	fc.fullCalendar('option', 'listSections', settings['agenda_sections']).fullCalendar('render');
	// TODO: save new settings in prefs
	}).val(fc.fullCalendar('option', 'listSections'));

	// hide event dialog when clicking somewhere into document
	$(document).bind('mousedown', dialog_check);

	rcmail.set_busy(false, 'loading', ui_loading);
	}

	// initialize more UI elements (deferred)
	window.setTimeout(init_calendar_ui, exec_deferred);

	// fetch counts for some calendars
	fetch_counts();

	// add proprietary css styles if not IE
	if (!bw.ie)
	$('div.fc-content').addClass('rcube-fc-content');

	// IE supresses 2nd click event when double-clicking
	if (bw.ie && bw.vendver < 9) {
	$('div.fc-content').bind('dblclick', function(e){
	if (!$(this).hasClass('fc-widget-header') && fc.fullCalendar('getView').name != 'table') {
	var date = fc.fullCalendar('getDate');
	var enddate = new Date(); enddate.setTime(date.getTime() + DAY_MS - 60000);
	event_edit_dialog('new', { start:date, end:enddate, allDay:true, calendar:me.selected_calendar });
	}
	});
	}
	} // end rcube_calendar class


	/* calendar plugin initialization */
	window.rcmail && rcmail.addEventListener('init', function(evt) {
	// configure toolbar buttons
	rcmail.register_command('addevent', function(){ cal.add_event(); }, true);
	rcmail.register_command('print', function(){ cal.print_calendars(); }, true);

	// configure list operations
	rcmail.register_command('calendar-create', function(){ cal.calendar_edit_dialog(null); }, true);
	rcmail.register_command('calendar-edit', function(){ cal.calendar_edit_dialog(cal.calendars[cal.selected_calendar]); }, false);
	rcmail.register_command('calendar-remove', function(){ cal.calendar_remove(cal.calendars[cal.selected_calendar]); }, false);
	rcmail.register_command('calendar-delete', function(){ cal.calendar_delete(cal.calendars[cal.selected_calendar]); }, false);
	rcmail.register_command('events-import', function(){ cal.import_events(cal.calendars[cal.selected_calendar]); }, true);
	rcmail.register_command('calendar-showurl', function(){ cal.showurl(cal.calendars[cal.selected_calendar]); }, false);
	rcmail.register_command('event-download', function(){ cal.event_download(cal.selected_event); }, true);
	rcmail.register_command('event-sendbymail', function(p, obj, e){ cal.event_sendbymail(cal.selected_event, e); }, true);
	rcmail.register_command('event-copy', function(){ cal.event_copy(cal.selected_event); }, true);
	rcmail.register_command('event-history', function(p, obj, e){ cal.event_history_dialog(cal.selected_event); }, false);

	// search and export events
	rcmail.register_command('export', function(){ cal.export_events(cal.calendars[cal.selected_calendar]); }, true);
	rcmail.register_command('search', function(){ cal.quicksearch(); }, true);
	rcmail.register_command('reset-search', function(){ cal.reset_quicksearch(); }, true);

	// resource invitation dialog
	rcmail.register_command('search-resource', function(){ cal.resource_search(); }, true);
	rcmail.register_command('reset-resource-search', function(){ cal.reset_resource_search(); }, true);
	rcmail.register_command('add-resource', function(){ cal.add_resource2event(); }, false);

	// register callback commands
	rcmail.addEventListener('plugin.refresh_source', function(data) { cal.calendar_refresh_source(data); });
	rcmail.addEventListener('plugin.destroy_source', function(p){ cal.calendar_destroy_source(p.id); });
	rcmail.addEventListener('plugin.unlock_saving', function(p){ cal.unlock_saving(); });
	rcmail.addEventListener('plugin.refresh_calendar', function(p){ cal.refresh(p); });
	rcmail.addEventListener('plugin.import_success', function(p){ cal.import_success(p); });
	rcmail.addEventListener('plugin.import_error', function(p){ cal.import_error(p); });
	rcmail.addEventListener('plugin.update_counts', function(p){ cal.update_counts(p); });
	rcmail.addEventListener('plugin.reload_view', function(p){ cal.reload_view(p); });
	rcmail.addEventListener('plugin.resource_data', function(p){ cal.resource_data_load(p); });
	rcmail.addEventListener('plugin.resource_owner', function(p){ cal.resource_owner_load(p); });
	rcmail.addEventListener('plugin.render_event_changelog', function(data){ cal.render_event_changelog(data); });
	rcmail.addEventListener('plugin.event_show_diff', function(data){ cal.event_show_diff(data); });
	rcmail.addEventListener('plugin.close_history_dialog', function(data){ cal.close_history_dialog(); });
	rcmail.addEventListener('plugin.event_show_revision', function(data){ cal.event_show_dialog(data, null, true); });
	rcmail.addEventListener('plugin.itip_message_processed', function(data){ cal.itip_message_processed(data); });
	rcmail.addEventListener('requestrefresh', function(q){ return cal.before_refresh(q); });

	// let's go
	var cal = new rcube_calendar_ui($.extend(rcmail.env.calendar_settings, rcmail.env.libcal_settings));

	$(window).resize(function(e) {
	// check target due to bugs in jquery
	// http://bugs.jqueryui.com/ticket/7514
	// http://bugs.jquery.com/ticket/9841
	if (e.target == window) {
	cal.view_resize();
	}
	}).resize();

	// show calendars list when ready
	$('#calendars').css('visibility', 'inherit');

	// show toolbar
	$('#toolbar').show();

	});
	diff --git a/plugins/calendar/localization/en_US.inc b/plugins/calendar/localization/en_US.inc
	index 43d07922..1ca5c632 100644
	--- a/plugins/calendar/localization/en_US.inc
	+++ b/plugins/calendar/localization/en_US.inc
	@@ -1,301 +1,299 @@
	<?php

	/**
	* Localizations for Kolab Calendar plugin
	*
	* Copyright (C) 2014, Kolab Systems AG
	*
	* For translation see https://www.transifex.com/projects/p/kolab/resource/calendar/
	*/

	$labels = array();

	// preferences
	$labels['default_view'] = 'Default view';
	$labels['time_format'] = 'Time format';
	$labels['timeslots'] = 'Time slots per hour';
	$labels['first_day'] = 'First weekday';
	$labels['first_hour'] = 'First hour to show';
	$labels['workinghours'] = 'Working hours';
	$labels['add_category'] = 'Add category';
	$labels['remove_category'] = 'Remove category';
	$labels['defaultcalendar'] = 'Create new events in';
	$labels['eventcoloring'] = 'Event coloring';
	$labels['coloringmode0'] = 'According to calendar';
	$labels['coloringmode1'] = 'According to category';
	$labels['coloringmode2'] = 'Calendar for outline, category for content';
	$labels['coloringmode3'] = 'Category for outline, calendar for content';
	$labels['afternothing'] = 'Do nothing';
	$labels['aftertrash'] = 'Move to Trash';
	$labels['afterdelete'] = 'Delete the message';
	$labels['afterflagdeleted'] = 'Flag as deleted';
	$labels['aftermoveto'] = 'Move to...';
	$labels['itipoptions'] = 'Event Invitations';
	$labels['afteraction'] = 'After an invitation or update message is processed';

	// calendar
	$labels['calendar'] = 'Calendar';
	$labels['calendars'] = 'Calendars';
	$labels['category'] = 'Category';
	$labels['categories'] = 'Categories';
	$labels['createcalendar'] = 'Create new calendar';
	$labels['editcalendar'] = 'Edit calendar properties';
	$labels['name'] = 'Name';
	$labels['color'] = 'Color';
	$labels['day'] = 'Day';
	$labels['week'] = 'Week';
	$labels['month'] = 'Month';
	$labels['agenda'] = 'Agenda';
	$labels['new'] = 'New';
	$labels['new_event'] = 'New event';
	$labels['edit_event'] = 'Edit event';
	$labels['edit'] = 'Edit';
	$labels['save'] = 'Save';
	$labels['removelist'] = 'Remove from list';
	$labels['cancel'] = 'Cancel';
	$labels['select'] = 'Select';
	$labels['print'] = 'Print';
	$labels['printtitle'] = 'Print calendars';
	$labels['title'] = 'Summary';
	$labels['description'] = 'Description';
	$labels['all-day'] = 'all-day';
	$labels['export'] = 'Export';
	$labels['exporttitle'] = 'Export to iCalendar';
	$labels['exportrange'] = 'Events from';
	$labels['exportattachments'] = 'With attachments';
	$labels['customdate'] = 'Custom date';
	$labels['location'] = 'Location';
	$labels['url'] = 'URL';
	$labels['date'] = 'Date';
	$labels['start'] = 'Start';
	$labels['starttime'] = 'Start time';
	$labels['end'] = 'End';
	$labels['endtime'] = 'End time';
	$labels['repeat'] = 'Repeat';
	$labels['selectdate'] = 'Choose date';
	$labels['freebusy'] = 'Show me as';
	$labels['free'] = 'Free';
	$labels['busy'] = 'Busy';
	$labels['outofoffice'] = 'Out of Office';
	$labels['tentative'] = 'Tentative';
	$labels['mystatus'] = 'My status';
	$labels['status'] = 'Status';
	$labels['status-confirmed'] = 'Confirmed';
	$labels['status-cancelled'] = 'Cancelled';
	$labels['priority'] = 'Priority';
	$labels['sensitivity'] = 'Privacy';
	$labels['public'] = 'public';
	$labels['private'] = 'private';
	$labels['confidential'] = 'confidential';
	$labels['links'] = 'Reference';
	$labels['alarms'] = 'Reminder';
	$labels['comment'] = 'Comment';
	$labels['created'] = 'Created';
	$labels['changed'] = 'Last Modified';
	$labels['unknown'] = 'Unknown';
	$labels['eventoptions'] = 'Options';
	$labels['generated'] = 'generated at';
	$labels['eventhistory'] = 'History';
	$labels['removelink'] = 'Remove email reference';
	$labels['printdescriptions'] = 'Print descriptions';
	$labels['parentcalendar'] = 'Insert inside';
	$labels['searchearlierdates'] = '« Search for earlier events';
	$labels['searchlaterdates'] = 'Search for later events »';
	$labels['andnmore'] = '$nr more...';
	$labels['togglerole'] = 'Click to toggle role';
	$labels['createfrommail'] = 'Save as event';
	$labels['importevents'] = 'Import events';
	$labels['importrange'] = 'Events from';
	$labels['onemonthback'] = '1 month back';
	$labels['nmonthsback'] = '$nr months back';
	$labels['showurl'] = 'Show calendar URL';
	$labels['showurldescription'] = 'Use the following address to access (read only) your calendar from other applications. You can copy and paste this into any calendar software that supports the iCal format.';
	$labels['caldavurldescription'] = 'Copy this address to a <a href="http://en.wikipedia.org/wiki/CalDAV" target="_blank">CalDAV</a> client application (e.g. Evolution or Mozilla Thunderbird) to fully synchronize this specific calendar with your computer or mobile device.';
	$labels['findcalendars'] = 'Find calendars...';
	$labels['searchterms'] = 'Search terms';
	$labels['calsearchresults'] = 'Available Calendars';
	$labels['calendarsubscribe'] = 'List permanently';
	$labels['nocalendarsfound'] = 'No calendars found';
	$labels['nrcalendarsfound'] = '$nr calendars found';
	$labels['quickview'] = 'View only this calendar';
	$labels['invitationspending'] = 'Pending invitations';
	$labels['invitationsdeclined'] = 'Declined invitations';
	$labels['changepartstat'] = 'Change participant status';
	$labels['rsvpcomment'] = 'Invitation text';

	// agenda view
	$labels['listrange'] = 'Range to display:';
	$labels['listsections'] = 'Divide into:';
	$labels['smartsections'] = 'Smart sections';
	$labels['until'] = 'until';
	$labels['today'] = 'Today';
	$labels['tomorrow'] = 'Tomorrow';
	$labels['thisweek'] = 'This week';
	$labels['nextweek'] = 'Next week';
	$labels['prevweek'] = 'Previous week';
	$labels['thismonth'] = 'This month';
	$labels['nextmonth'] = 'Next month';
	$labels['weekofyear'] = 'Week';
	$labels['pastevents'] = 'Past';
	$labels['futureevents'] = 'Future';

	// alarm/reminder settings
	$labels['showalarms'] = 'Show reminders';
	$labels['defaultalarmtype'] = 'Default reminder setting';
	$labels['defaultalarmoffset'] = 'Default reminder time';

	// attendees
	$labels['attendee'] = 'Participant';
	$labels['role'] = 'Role';
	$labels['availability'] = 'Avail.';
	$labels['confirmstate'] = 'Status';
	$labels['addattendee'] = 'Add participant';
	$labels['roleorganizer'] = 'Organizer';
	$labels['rolerequired'] = 'Required';
	$labels['roleoptional'] = 'Optional';
	$labels['rolechair'] = 'Chair';
	$labels['rolenonparticipant'] = 'Absent';
	$labels['cutypeindividual'] = 'Individual';
	$labels['cutypegroup'] = 'Group';
	$labels['cutyperesource'] = 'Resource';
	$labels['cutyperoom'] = 'Room';
	$labels['availfree'] = 'Free';
	$labels['availbusy'] = 'Busy';
	$labels['availunknown'] = 'Unknown';
	$labels['availtentative'] = 'Tentative';
	$labels['availoutofoffice'] = 'Out of Office';
	-$labels['delegatedto'] = 'Delegated to: ';
	-$labels['delegatedfrom'] = 'Delegated from: ';
	$labels['scheduletime'] = 'Find availability';
	$labels['sendinvitations'] = 'Send invitations';
	$labels['sendnotifications'] = 'Notify participants about modifications';
	$labels['sendcancellation'] = 'Notify participants about event cancellation';
	$labels['onlyworkinghours'] = 'Find availability within my working hours';
	$labels['reqallattendees'] = 'Required/all participants';
	$labels['prevslot'] = 'Previous Slot';
	$labels['nextslot'] = 'Next Slot';
	$labels['suggestedslot'] = 'Suggested Slot';
	$labels['noslotfound'] = 'Unable to find a free time slot';
	$labels['invitationsubject'] = 'You\'ve been invited to "$title"';
	$labels['invitationmailbody'] = "\$title\n\nWhen: \$date\n\nInvitees: \$attendees\n\nPlease find attached an iCalendar file with all the event details which you can import to your calendar application.";
	$labels['invitationattendlinks'] = "In case your email client doesn't support iTip requests you can use the following link to either accept or decline this invitation:\n\$url";
	$labels['eventupdatesubject'] = '"$title" has been updated';
	$labels['eventupdatesubjectempty'] = 'An event that concerns you has been updated';
	$labels['eventupdatemailbody'] = "\$title\n\nWhen: \$date\n\nInvitees: \$attendees\n\nPlease find attached an iCalendar file with the updated event details which you can import to your calendar application.";
	$labels['eventcancelsubject'] = '"$title" has been cancelled';
	$labels['eventcancelmailbody'] = "\$title\n\nWhen: \$date\n\nInvitees: \$attendees\n\nThe event has been cancelled by \$organizer.\n\nPlease find attached an iCalendar file with the updated event details.";

	// invitation handling (overrides labels from libcalendaring)
	$labels['itipobjectnotfound'] = 'The event referred by this message was not found in your calendar.';

	$labels['itipmailbodyaccepted'] = "\$sender has accepted the invitation to the following event:\n\n\$title\n\nWhen: \$date\n\nInvitees: \$attendees";
	$labels['itipmailbodytentative'] = "\$sender has tentatively accepted the invitation to the following event:\n\n\$title\n\nWhen: \$date\n\nInvitees: \$attendees";
	$labels['itipmailbodydeclined'] = "\$sender has declined the invitation to the following event:\n\n\$title\n\nWhen: \$date\n\nInvitees: \$attendees";
	$labels['itipmailbodycancel'] = "\$sender has rejected your participation in the following event:\n\n\$title\n\nWhen: \$date";
	$labels['itipmailbodydelegated'] = "\$sender has delegated the participation in the following event:\n\n\$title\n\nWhen: \$date";
	$labels['itipmailbodydelegatedto'] = "\$sender has delegated the participation in the following event to you:\n\n\$title\n\nWhen: \$date";

	$labels['itipdeclineevent'] = 'Do you want to decline your invitation to this event?';
	$labels['declinedeleteconfirm'] = 'Do you also want to delete this declined event from your calendar?';
	$labels['itipcomment'] = 'Invitation/notification comment';
	$labels['itipcommenttitle'] = 'This comment will be attached to the invitation/notification message sent to participants';

	$labels['notanattendee'] = 'You\'re not listed as an attendee of this event';
	$labels['eventcancelled'] = 'The event has been cancelled';
	$labels['saveincalendar'] = 'save in';
	$labels['updatemycopy'] = 'Update in my calendar';
	$labels['savetocalendar'] = 'Save to calendar';
	$labels['openpreview'] = 'Check Calendar';
	$labels['noearlierevents'] = 'No earlier events';
	$labels['nolaterevents'] = 'No later events';

	// resources
	$labels['resource'] = 'Resource';
	$labels['addresource'] = 'Book resource';
	$labels['findresources'] = 'Find resources';
	$labels['resourcedetails'] = 'Details';
	$labels['resourceavailability'] = 'Availability';
	$labels['resourceowner'] = 'Owner';
	$labels['resourceadded'] = 'The resource was added to your event';

	// event dialog tabs
	$labels['tabsummary'] = 'Summary';
	$labels['tabrecurrence'] = 'Recurrence';
	$labels['tabattendees'] = 'Participants';
	$labels['tabresources'] = 'Resources';
	$labels['tabattachments'] = 'Attachments';
	$labels['tabsharing'] = 'Sharing';

	// messages
	$labels['deleteobjectconfirm'] = 'Do you really want to delete this event?';
	$labels['deleteventconfirm'] = 'Do you really want to delete this event?';
	$labels['deletecalendarconfirm'] = 'Do you really want to delete this calendar with all its events?';
	$labels['deletecalendarconfirmrecursive'] = 'Do you really want to delete this calendar with all its events and sub-calendars?';
	$labels['savingdata'] = 'Saving data...';
	$labels['errorsaving'] = 'Failed to save changes.';
	$labels['operationfailed'] = 'The requested operation failed.';
	$labels['invalideventdates'] = 'Invalid dates entered! Please check your input.';
	$labels['invalidcalendarproperties'] = 'Invalid calendar properties! Please set a valid name.';
	$labels['searchnoresults'] = 'No events found in the selected calendars.';
	$labels['successremoval'] = 'The event has been deleted successfully.';
	$labels['successrestore'] = 'The event has been restored successfully.';
	$labels['errornotifying'] = 'Failed to send notifications to event participants';
	$labels['errorimportingevent'] = 'Failed to import the event';
	$labels['importwarningexists'] = 'A copy of this event already exists in your calendar.';
	$labels['newerversionexists'] = 'A newer version of this event already exists! Aborted.';
	$labels['nowritecalendarfound'] = 'No calendar found to save the event';
	$labels['importedsuccessfully'] = 'The event was successfully added to \'$calendar\'';
	$labels['updatedsuccessfully'] = 'The event was successfully updated in \'$calendar\'';
	$labels['attendeupdateesuccess'] = 'Successfully updated the participant\'s status';
	$labels['itipsendsuccess'] = 'Invitation sent to participants.';
	$labels['itipresponseerror'] = 'Failed to send the response to this event invitation';
	$labels['itipinvalidrequest'] = 'This invitation is no longer valid';
	$labels['sentresponseto'] = 'Successfully sent invitation response to $mailto';
	$labels['localchangeswarning'] = 'You are about to make changes that will only be reflected on your calendar and not be sent to the organizer of the event.';
	$labels['importsuccess'] = 'Successfully imported $nr events';
	$labels['importnone'] = 'No events found to be imported';
	$labels['importerror'] = 'An error occured while importing';
	$labels['aclnorights'] = 'You do not have administrator rights on this calendar.';

	$labels['changeeventconfirm'] = 'Change event';
	$labels['removeeventconfirm'] = 'Delete event';
	$labels['changerecurringeventwarning'] = 'This is a recurring event. Would you like to edit the current event only, this and all future occurences, all occurences or save it as a new event?';
	$labels['removerecurringeventwarning'] = 'This is a recurring event. Would you like to delete the current event only, this and all future occurences or all occurences of this event?';
	$labels['removerecurringallonly'] = 'This is a recurring event. As a participant, you can only delete the entire event with all occurences.';
	$labels['currentevent'] = 'Current';
	$labels['futurevents'] = 'Future';
	$labels['allevents'] = 'All';
	$labels['saveasnew'] = 'Save as new';

	// birthdays calendar
	$labels['birthdays'] = 'Birthdays';
	$labels['birthdayscalendar'] = 'Birthdays Calendar';
	$labels['displaybirthdayscalendar'] = 'Display birthdays calendar';
	$labels['birthdayscalendarsources'] = 'From these address books';
	$labels['birthdayeventtitle'] = '$name\'s Birthday';
	$labels['birthdayage'] = 'Age $age';

	// history dialog
	$labels['objectchangelog'] = 'Change History';
	$labels['objectdiff'] = 'Changes from $rev1 to $rev2';
	$labels['objectnotfound'] = 'Failed to load event data';
	$labels['objectchangelognotavailable'] = 'Change history is not available for this event';
	$labels['objectdiffnotavailable'] = 'No comparison possible for the selected revisions';
	$labels['revisionrestoreconfirm'] = 'Do you really want to restore revision $rev of this event? This will replace the current event with the old version.';
	$labels['objectrestoresuccess'] = 'Revision $rev successfully restored';
	$labels['objectrestoreerror'] = 'Failed to restore the old revision';


	// (hidden) titles and labels for accessibility annotations
	$labels['arialabelminical'] = 'Calendar date selection';
	$labels['arialabelcalendarview'] = 'Calendar view';
	$labels['arialabelsearchform'] = 'Event search form';
	$labels['arialabelquicksearchbox'] = 'Event search input';
	$labels['arialabelcalsearchform'] = 'Calendars search form';
	$labels['calendaractions'] = 'Calendar actions';
	$labels['arialabeleventattendees'] = 'Event participants list';
	$labels['arialabeleventresources'] = 'Event resources list';
	$labels['arialabelresourcesearchform'] = 'Resources search form';
	$labels['arialabelresourceselection'] = 'Available resources';

	?>
	diff --git a/plugins/libcalendaring/libcalendaring.js b/plugins/libcalendaring/libcalendaring.js
	index d9f24751..2836986b 100644
	--- a/plugins/libcalendaring/libcalendaring.js
	+++ b/plugins/libcalendaring/libcalendaring.js
	@@ -1,1401 +1,1401 @@
	/**
	* Basic Javascript utilities for calendar-related plugins
	*
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* @licstart The following is the entire license notice for the
	* JavaScript code in this page.
	*
	* Copyright (C) 2012-2015, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	* @licend The above is the entire license notice
	* for the JavaScript code in this page.
	*/

	function rcube_libcalendaring(settings)
	{
	// member vars
	this.settings = settings \|\| {};
	this.alarm_ids = [];
	this.alarm_dialog = null;
	this.snooze_popup = null;
	this.dismiss_link = null;
	this.group2expand = {};

	// abort if env isn't set
	if (!settings \|\| !settings.date_format)
	return;

	// private vars
	var me = this;
	var gmt_offset = (new Date().getTimezoneOffset() / -60) - (settings.timezone \|\| 0) - (settings.dst \|\| 0);
	var client_timezone = new Date().getTimezoneOffset();

	// general datepicker settings
	var datepicker_settings = {
	// translate from fullcalendar format to datepicker format
	dateFormat: settings.date_format.replace(/M/g, 'm').replace(/mmmmm/, 'MM').replace(/mmm/, 'M').replace(/dddd/, 'DD').replace(/ddd/, 'D').replace(/yy/g, 'y'),
	firstDay : settings.first_day,
	dayNamesMin: settings.days_short,
	monthNames: settings.months,
	monthNamesShort: settings.months,
	changeMonth: false,
	showOtherMonths: true,
	selectOtherMonths: true
	};


	/**
	* Quote html entities
	*/
	var Q = this.quote_html = function(str)
	{
	return String(str).replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"');
	};

	/**
	* Create a nice human-readable string for the date/time range
	*/
	this.event_date_text = function(event, voice)
	{
	if (!event.start)
	return '';
	if (!event.end)
	event.end = event.start;

	var fromto, duration = event.end.getTime() / 1000 - event.start.getTime() / 1000,
	until = voice ? ' ' + rcmail.gettext('until','libcalendaring') + ' ' : ' — ';
	if (event.allDay) {
	fromto = this.format_datetime(event.start, 1, voice)
	+ (duration > 86400 \|\| event.start.getDay() != event.end.getDay() ? until + this.format_datetime(event.end, 1, voice) : '');
	}
	else if (duration < 86400 && event.start.getDay() == event.end.getDay()) {
	fromto = this.format_datetime(event.start, 0, voice)
	+ (duration > 0 ? until + this.format_datetime(event.end, 2, voice) : '');
	}
	else {
	fromto = this.format_datetime(event.start, 0, voice)
	+ (duration > 0 ? until + this.format_datetime(event.end, 0, voice) : '');
	}

	return fromto;
	};


	/**
	* From time and date strings to a real date object
	*/
	this.parse_datetime = function(time, date)
	{
	// we use the utility function from datepicker to parse dates
	var date = date ? $.datepicker.parseDate(datepicker_settings.dateFormat, date, datepicker_settings) : new Date();

	var time_arr = time.replace(/\s[ap][.m]/i, '').replace(/0([0-9])/g, '$1').split(/[:.]/);
	if (!isNaN(time_arr[0])) {
	date.setHours(time_arr[0]);
	if (time.match(/p[.m]*/i) && date.getHours() < 12)
	date.setHours(parseInt(time_arr[0]) + 12);
	else if (time.match(/a[.m]*/i) && date.getHours() == 12)
	date.setHours(0);
	}
	if (!isNaN(time_arr[1]))
	date.setMinutes(time_arr[1]);

	return date;
	}

	/**
	* Convert an ISO 8601 formatted date string from the server into a Date object.
	* Timezone information will be ignored, the server already provides dates in user's timezone.
	*/
	this.parseISO8601 = function(s)
	{
	// already a Date object?
	if (s && s.getMonth) {
	return s;
	}

	// force d to be on check's YMD, for daylight savings purposes
	var fixDate = function(d, check) {
	if (+d) { // prevent infinite looping on invalid dates
	while (d.getDate() != check.getDate()) {
	d.setTime(+d + (d < check ? 1 : -1) * 3600000);
	}
	}
	}

	// derived from http://delete.me.uk/2005/03/iso8601.html
	var m = s && s.match(/^([0-9]{4})(-([0-9]{2})(-([0-9]{2})([T ]([0-9]{2}):([0-9]{2})(:([0-9]{2})(\.([0-9]+))?)?(Z\|(([-+])([0-9]{2})(:?([0-9]{2}))?))?)?)?)?$/);
	if (!m) {
	return null;
	}

	var date = new Date(m[1], 0, 2),
	check = new Date(m[1], 0, 2, 9, 0);
	if (m[3]) {
	date.setMonth(m[3] - 1);
	check.setMonth(m[3] - 1);
	}
	if (m[5]) {
	date.setDate(m[5]);
	check.setDate(m[5]);
	}
	fixDate(date, check);
	if (m[7]) {
	date.setHours(m[7]);
	}
	if (m[8]) {
	date.setMinutes(m[8]);
	}
	if (m[10]) {
	date.setSeconds(m[10]);
	}
	if (m[12]) {
	date.setMilliseconds(Number("0." + m[12]) * 1000);
	}
	fixDate(date, check);

	return date;
	}

	/**
	* Turn the given date into an ISO 8601 date string understandable by PHPs strtotime()
	*/
	this.date2ISO8601 = function(date)
	{
	var zeropad = function(num) { return (num < 10 ? '0' : '') + num; };

	return date.getFullYear() + '-' + zeropad(date.getMonth()+1) + '-' + zeropad(date.getDate())
	+ 'T' + zeropad(date.getHours()) + ':' + zeropad(date.getMinutes()) + ':' + zeropad(date.getSeconds());
	};

	/**
	* Format the given date object according to user's prefs
	*/
	this.format_datetime = function(date, mode, voice)
	{
	var res = '';
	if (!mode \|\| mode == 1) {
	res += $.datepicker.formatDate(voice ? 'MM d yy' : datepicker_settings.dateFormat, date, datepicker_settings);
	}
	if (!mode) {
	res += voice ? ' ' + rcmail.gettext('at','libcalendaring') + ' ' : ' ';
	}
	if (!mode \|\| mode == 2) {
	res += this.format_time(date, voice);
	}

	return res;
	}

	/**
	* Clone from fullcalendar.js
	*/
	this.format_time = function(date, voice)
	{
	var zeroPad = function(n) { return (n < 10 ? '0' : '') + n; }
	var formatters = {
	s : function(d) { return d.getSeconds() },
	ss : function(d) { return zeroPad(d.getSeconds()) },
	m : function(d) { return d.getMinutes() },
	mm : function(d) { return zeroPad(d.getMinutes()) },
	h : function(d) { return d.getHours() % 12 \|\| 12 },
	hh : function(d) { return zeroPad(d.getHours() % 12 \|\| 12) },
	H : function(d) { return d.getHours() },
	HH : function(d) { return zeroPad(d.getHours()) },
	t : function(d) { return d.getHours() < 12 ? 'a' : 'p' },
	tt : function(d) { return d.getHours() < 12 ? 'am' : 'pm' },
	T : function(d) { return d.getHours() < 12 ? 'A' : 'P' },
	TT : function(d) { return d.getHours() < 12 ? 'AM' : 'PM' }
	};

	var i, i2, c, formatter, res = '',
	format = voice ? settings['time_format'].replace(':',' ').replace('HH','H').replace('hh','h').replace('mm','m').replace('ss','s') : settings['time_format'];
	for (i=0; i < format.length; i++) {
	c = format.charAt(i);
	for (i2=Math.min(i+2, format.length); i2 > i; i2--) {
	if (formatter = formatters[format.substring(i, i2)]) {
	res += formatter(date);
	i = i2 - 1;
	break;
	}
	}
	if (i2 == i) {
	res += c;
	}
	}

	return res;
	}

	/**
	* Convert the given Date object into a unix timestamp respecting browser's and user's timezone settings
	*/
	this.date2unixtime = function(date)
	{
	var dst_offset = (client_timezone - date.getTimezoneOffset()) * 60; // adjust DST offset
	return Math.round(date.getTime()/1000 + gmt_offset * 3600 + dst_offset);
	}

	/**
	* Turn a unix timestamp value into a Date object
	*/
	this.fromunixtime = function(ts)
	{
	ts -= gmt_offset * 3600;
	var date = new Date(ts * 1000),
	dst_offset = (client_timezone - date.getTimezoneOffset()) * 60;
	if (dst_offset) // adjust DST offset
	date.setTime((ts + 3600) * 1000);
	return date;
	}

	/**
	* Simple plaintext to HTML converter, makig URLs clickable
	*/
	this.text2html = function(str, maxlen, maxlines)
	{
	var html = Q(String(str));

	// limit visible text length
	if (maxlen) {
	var morelink = '<span>... <a href="#more" onclick="$(this).parent().hide().next().show();return false" class="morelink">'+rcmail.gettext('showmore','libcalendaring')+'</a></span><span style="display:none">',
	lines = html.split(/\r?\n/),
	words, out = '', len = 0;

	for (var i=0; i < lines.length; i++) {
	len += lines[i].length;
	if (maxlines && i == maxlines - 1) {
	out += lines[i] + '\n' + morelink;
	maxlen = html.length * 2;
	}
	else if (len > maxlen) {
	len = out.length;
	words = lines[i].split(' ');
	for (var j=0; j < words.length; j++) {
	len += words[j].length + 1;
	out += words[j] + ' ';
	if (len > maxlen) {
	out += morelink;
	maxlen = html.length * 2;
	maxlines = 0;
	}
	}
	out += '\n';
	}
	else
	out += lines[i] + '\n';
	}

	if (maxlen > str.length)
	out += '</span>';

	html = out;
	}

	// simple link parser (similar to rcube_string_replacer class in PHP)
	var utf_domain = '[^?&@"\'/\$\$\\s\\r\\t\\n]+\\.([^\x00-\x2f\x3b-\x40\x5b-\x60\x7b-\x7f]{2,}\|xn--[a-z0-9]{2,})';
	var url1 = '.:;,', url2 = 'a-z0-9%=#@+?&/_~\\[\\]-';
	var link_pattern = new RegExp('([hf]t+ps?://)('+utf_domain+'(['+url1+']?['+url2+']+)*)', 'ig');
	var mailto_pattern = new RegExp('([^\\s\\n\$\$;]+@'+utf_domain+')', 'ig');
	var link_replace = function(matches, p1, p2) {
	var title = '', text = p2;
	if (p2 && p2.length > 55) {
	text = p2.substr(0, 45) + '...' + p2.substr(-8);
	title = p1 + p2;
	}
	return '<a href="'+p1+p2+'" class="extlink" target="_blank" title="'+title+'">'+p1+text+'</a>'
	};

	return html
	.replace(link_pattern, link_replace)
	.replace(mailto_pattern, '<a href="mailto:$1">$1</a>')
	.replace(/(mailto:)([^"]+)"/g, '$1$2" onclick="rcmail.command(\'compose\', \'$2\');return false"')
	.replace(/\n/g, "<br/>");
	};

	this.init_alarms_edit = function(prefix, index)
	{
	var edit_type = $(prefix+' select.edit-alarm-type'),
	dom_id = edit_type.attr('id');

	// register events on alarm fields
	edit_type.change(function(){
	$(this).parent().find('span.edit-alarm-values')[(this.selectedIndex>0?'show':'hide')]();
	});
	$(prefix+' select.edit-alarm-offset').change(function(){
	var val = $(this).val(), parent = $(this).parent();
	parent.find('.edit-alarm-date, .edit-alarm-time')[val == '@' ? 'show' : 'hide']();
	parent.find('.edit-alarm-value').prop('disabled', val === '@' \|\| val === '0');
	parent.find('.edit-alarm-related')[val == '@' ? 'hide' : 'show']();
	});

	$(prefix+' .edit-alarm-date').removeClass('hasDatepicker').removeAttr('id').datepicker(datepicker_settings);

	$(prefix).on('click', 'a.delete-alarm', function(e){
	if ($(this).closest('.edit-alarm-item').siblings().length > 0) {
	$(this).closest('.edit-alarm-item').remove();
	}
	return false;
	});

	// set a unique id attribute and set label reference accordingly
	if ((index \|\| 0) > 0 && dom_id) {
	dom_id += ':' + (new Date().getTime());
	edit_type.attr('id', dom_id);
	$(prefix+' label:first').attr('for', dom_id);
	}

	$(prefix).on('click', 'a.add-alarm', function(e){
	var i = $(this).closest('.edit-alarm-item').siblings().length + 1;
	var item = $(this).closest('.edit-alarm-item').clone(false)
	.removeClass('first')
	.appendTo(prefix);

	me.init_alarms_edit(prefix + ' .edit-alarm-item:eq(' + i + ')', i);
	$('select.edit-alarm-type, select.edit-alarm-offset', item).change();
	return false;
	});
	}

	this.set_alarms_edit = function(prefix, valarms)
	{
	$(prefix + ' .edit-alarm-item:gt(0)').remove();

	var i, alarm, domnode, val, offset;
	for (i=0; i < valarms.length; i++) {
	alarm = valarms[i];
	if (!alarm.action)
	alarm.action = 'DISPLAY';

	if (i == 0) {
	domnode = $(prefix + ' .edit-alarm-item').eq(0);
	}
	else {
	domnode = $(prefix + ' .edit-alarm-item').eq(0).clone(false).removeClass('first').appendTo(prefix);
	this.init_alarms_edit(prefix + ' .edit-alarm-item:eq(' + i + ')', i);
	}

	$('select.edit-alarm-type', domnode).val(alarm.action);
	$('select.edit-alarm-related', domnode).val(/END/i.test(alarm.related) ? 'end' : 'start');

	if (String(alarm.trigger).match(/@(\d+)/)) {
	var ondate = this.fromunixtime(parseInt(RegExp.$1));
	$('select.edit-alarm-offset', domnode).val('@');
	$('input.edit-alarm-value', domnode).val('');
	$('input.edit-alarm-date', domnode).val(this.format_datetime(ondate, 1));
	$('input.edit-alarm-time', domnode).val(this.format_datetime(ondate, 2));
	}
	else if (String(alarm.trigger).match(/^[-+]*0[MHDS]$/)) {
	$('input.edit-alarm-value', domnode).val('0');
	$('select.edit-alarm-offset', domnode).val('0');
	}
	else if (String(alarm.trigger).match(/([-+])(\d+)([MHDS])/)) {
	val = RegExp.$2; offset = ''+RegExp.$1+RegExp.$3;
	$('input.edit-alarm-value', domnode).val(val);
	$('select.edit-alarm-offset', domnode).val(offset);
	}
	}

	// set correct visibility by triggering onchange handlers
	$(prefix + ' select.edit-alarm-type, ' + prefix + ' select.edit-alarm-offset').change();
	};

	this.serialize_alarms = function(prefix)
	{
	var valarms = [];

	$(prefix + ' .edit-alarm-item').each(function(i, elem) {
	var val, offset, alarm = {
	action: $('select.edit-alarm-type', elem).val(),
	related: $('select.edit-alarm-related', elem).val()
	};

	if (alarm.action) {
	offset = $('select.edit-alarm-offset', elem).val();
	if (offset == '@') {
	alarm.trigger = '@' + me.date2unixtime(me.parse_datetime($('input.edit-alarm-time', elem).val(), $('input.edit-alarm-date', elem).val()));
	}
	else if (offset === '0') {
	alarm.trigger = '0S';
	}
	else if (!isNaN((val = parseInt($('input.edit-alarm-value', elem).val()))) && val >= 0) {
	alarm.trigger = offset[0] + val + offset[1];
	}

	valarms.push(alarm);
	}
	});

	return valarms;
	};

	// format time string
	var time_autocomplete_format = function(hour, minutes, start) {
	var time, diff, unit, duration = '', d = new Date();

	d.setHours(hour);
	d.setMinutes(minutes);
	time = me.format_time(d);

	if (start) {
	diff = Math.floor((d.getTime() - start.getTime()) / 60000);
	if (diff > 0) {
	unit = 'm';
	if (diff >= 60) {
	unit = 'h';
	diff = Math.round(diff / 3) / 20;
	}
	duration = ' (' + diff + unit + ')';
	}
	}

	return [time, duration];
	};

	var time_autocomplete_list = function(p, callback) {
	// Time completions
	var st, h, step = 15, result = [], now = new Date(),
	id = String(this.element.attr('id')),
	m = id.match(/^(.*)-(starttime\|endtime)$/),
	start = (m && m[2] == 'endtime'
	&& (st = $('#' + m[1] + '-starttime').val())
	&& $('#' + m[1] + '-startdate').val() == $('#' + m[1] + '-enddate').val())
	? me.parse_datetime(st, '') : null,
	full = p.term - 1 > 0 \|\| p.term.length > 1,
	hours = start ? start.getHours() : (full ? me.parse_datetime(p.term, '') : now).getHours(),
	minutes = hours * 60 + (full ? 0 : now.getMinutes()),
	min = Math.ceil(minutes / step) * step % 60,
	hour = Math.floor(Math.ceil(minutes / step) * step / 60);

	// list hours from 0:00 till now
	for (h = start ? start.getHours() : 0; h < hours; h++)
	result.push(time_autocomplete_format(h, 0, start));

	// list 15min steps for the next two hours
	for (; h < hour + 2 && h < 24; h++) {
	while (min < 60) {
	result.push(time_autocomplete_format(h, min, start));
	min += step;
	}
	min = 0;
	}

	// list the remaining hours till 23:00
	while (h < 24)
	result.push(time_autocomplete_format((h++), 0, start));

	return callback(result);
	};

	var time_autocomplete_open = function(event, ui) {
	// scroll to current time
	var $this = $(this),
	widget = $this.autocomplete('widget')
	menu = $this.data('ui-autocomplete').menu,
	amregex = /^(.+)(a[.m]*)/i,
	pmregex = /^(.+)(a[.m]*)/i,
	val = $(this).val().replace(amregex, '0:$1').replace(pmregex, '1:$1');

	widget.css('width', '10em');

	if (val === '')
	menu._scrollIntoView(widget.children('li:first'));
	else
	widget.children().each(function() {
	var li = $(this),
	html = li.children().first().html()
	.replace(/\s+$.+$$/, '')
	.replace(amregex, '0:$1')
	.replace(pmregex, '1:$1');

	if (html.indexOf(val) == 0)
	menu._scrollIntoView(li);
	});
	};

	/**
	* Initializes time autocompletion
	*/
	this.init_time_autocomplete = function(elem, props)
	{
	var default_props = {
	delay: 100,
	minLength: 1,
	appendTo: props.container,
	source: time_autocomplete_list,
	open: time_autocomplete_open,
	// change: time_autocomplete_change,
	select: function(event, ui) {
	$(this).val(ui.item[0]).change();
	return false;
	}
	};

	$(elem).attr('autocomplete', "off")
	.autocomplete($.extend(default_props, props))
	.click(function() { // show drop-down upon clicks
	$(this).autocomplete('search', $(this).val() ? $(this).val().replace(/\D.*/, "") : " ");
	});

	$(elem).data('ui-autocomplete')._renderItem = function(ul, item) {
	return $('<li>')
	.data('ui-autocomplete-item', item)
	.append('<a>' + item[0] + item[1] + '</a>')
	.appendTo(ul);
	};
	};

	/*** Alarms handling ***/

	/**
	* Display a notification for the given pending alarms
	*/
	this.display_alarms = function(alarms)
	{
	// clear old alert first
	if (this.alarm_dialog)
	this.alarm_dialog.dialog('destroy').remove();

	var i, actions, adismiss, asnooze, alarm, html,
	audio_alarms = [], records = [], event_ids = [], buttons = {};

	for (i=0; i < alarms.length; i++) {
	alarm = alarms[i];
	alarm.start = this.parseISO8601(alarm.start);
	alarm.end = this.parseISO8601(alarm.end);

	if (alarm.action == 'AUDIO') {
	audio_alarms.push(alarm);
	continue;
	}

	event_ids.push(alarm.id);

	html = '<h3 class="event-title">' + Q(alarm.title) + '</h3>';
	html += '<div class="event-section">' + Q(alarm.location \|\| '') + '</div>';
	html += '<div class="event-section">' + Q(this.event_date_text(alarm)) + '</div>';

	adismiss = $('<a href="#" class="alarm-action-dismiss"></a>').html(rcmail.gettext('dismiss','libcalendaring')).click(function(e){
	me.dismiss_link = $(this);
	me.dismiss_alarm(me.dismiss_link.data('id'), 0, e);
	});
	asnooze = $('<a href="#" class="alarm-action-snooze"></a>').html(rcmail.gettext('snooze','libcalendaring')).click(function(e){
	me.snooze_dropdown($(this), e);
	e.stopPropagation();
	return false;
	});
	actions = $('<div>').addClass('alarm-actions').append(adismiss.data('id', alarm.id)).append(asnooze.data('id', alarm.id));

	records.push($('<div>').addClass('alarm-item').html(html).append(actions));
	}

	if (audio_alarms.length)
	this.audio_alarms(audio_alarms);

	if (!records.length)
	return;

	this.alarm_dialog = $('<div>').attr('id', 'alarm-display').append(records);

	buttons[rcmail.gettext('close')] = function() {
	$(this).dialog('close');
	};

	buttons[rcmail.gettext('dismissall','libcalendaring')] = function(e) {
	// submit dismissed event_ids to server
	me.dismiss_alarm(me.alarm_ids.join(','), 0, e);
	$(this).dialog('close');
	};

	this.alarm_dialog.appendTo(document.body).dialog({
	modal: false,
	resizable: true,
	closeOnEscape: false,
	dialogClass: 'alarms',
	title: rcmail.gettext('alarmtitle','libcalendaring'),
	buttons: buttons,
	open: function() {
	setTimeout(function() {
	me.alarm_dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
	}, 5);
	},
	close: function() {
	$('#alarm-snooze-dropdown').hide();
	$(this).dialog('destroy').remove();
	me.alarm_dialog = null;
	me.alarm_ids = null;
	},
	drag: function(event, ui) {
	$('#alarm-snooze-dropdown').hide();
	}
	});

	this.alarm_dialog.closest('div[role=dialog]').attr('role', 'alertdialog');

	this.alarm_ids = event_ids;
	};

	/**
	* Display a notification and play a sound for a set of alarms
	*/
	this.audio_alarms = function(alarms)
	{
	var elem, txt = [],
	src = rcmail.assets_path('plugins/libcalendaring/alarm'),
	plugin = navigator.mimeTypes ? navigator.mimeTypes['audio/mp3'] : {};

	// first generate and display notification text
	$.each(alarms, function() { txt.push(this.title); });

	rcmail.display_message(rcmail.gettext('alarmtitle','libcalendaring') + ': ' + Q(txt.join(', ')), 'notice', 10000);

	// Internet Explorer does not support wav files,
	// support in other browsers depends on enabled plugins,
	// so we use wav as a fallback
	src += bw.ie \|\| (plugin && plugin.enabledPlugin) ? '.mp3' : '.wav';

	// HTML5
	try {
	elem = $('<audio>').attr('src', src);
	elem.get(0).play();
	}
	// old method
	catch (e) {
	elem = $('<embed id="libcalsound" src="' + src + '" hidden=true autostart=true loop=false />');
	elem.appendTo($('body'));
	window.setTimeout("$('#libcalsound').remove()", 10000);
	}
	};

	/**
	* Show a drop-down menu with a selection of snooze times
	*/
	this.snooze_dropdown = function(link, event)
	{
	if (!this.snooze_popup) {
	this.snooze_popup = $('#alarm-snooze-dropdown');
	// create popup if not found
	if (!this.snooze_popup.length) {
	this.snooze_popup = $('<div>').attr('id', 'alarm-snooze-dropdown').addClass('popupmenu').appendTo(document.body);
	this.snooze_popup.html(rcmail.env.snooze_select)
	}
	$('#alarm-snooze-dropdown a').click(function(e){
	var time = String(this.href).replace(/.+#/, '');
	me.dismiss_alarm($('#alarm-snooze-dropdown').data('id'), time, e);
	return false;
	});
	}

	// hide visible popup
	if (this.snooze_popup.is(':visible') && this.snooze_popup.data('id') == link.data('id')) {
	rcmail.command('menu-close', 'alarm-snooze-dropdown', link.get(0), event);
	this.dismiss_link = null;
	}
	else { // open popup below the clicked link
	rcmail.command('menu-open', 'alarm-snooze-dropdown', link.get(0), event);
	this.snooze_popup.data('id', link.data('id'));
	this.dismiss_link = link;
	}
	};

	/**
	* Dismiss or snooze alarms for the given event
	*/
	this.dismiss_alarm = function(id, snooze, event)
	{
	rcmail.command('menu-close', 'alarm-snooze-dropdown', null, event);
	rcmail.http_post('utils/plugin.alarms', { action:'dismiss', data:{ id:id, snooze:snooze } });

	// remove dismissed alarm from list
	if (this.dismiss_link) {
	this.dismiss_link.closest('div.alarm-item').hide();
	var new_ids = jQuery.grep(this.alarm_ids, function(v){ return v != id; });
	if (new_ids.length)
	this.alarm_ids = new_ids;
	else
	this.alarm_dialog.dialog('close');
	}

	this.dismiss_link = null;
	};


	/*** Recurrence form handling ***/

	/**
	* Install event handlers on recurrence form elements
	*/
	this.init_recurrence_edit = function(prefix)
	{
	// toggle recurrence frequency forms
	$('#edit-recurrence-frequency').change(function(e){
	var freq = $(this).val().toLowerCase();
	$('.recurrence-form').hide();
	if (freq) {
	$('#recurrence-form-'+freq).show();
	if (freq != 'rdate')
	$('#recurrence-form-until').show();
	}
	});
	$('#recurrence-form-rdate input.button.add').click(function(e){
	var dt, dv = $('#edit-recurrence-rdate-input').val();
	if (dv && (dt = me.parse_datetime('12:00', dv))) {
	me.add_rdate(dt);
	me.sort_rdates();
	$('#edit-recurrence-rdate-input').val('')
	}
	else {
	$('#edit-recurrence-rdate-input').select();
	}
	});
	$('#edit-recurrence-rdates').on('click', 'a.delete', function(e){
	$(this).closest('li').remove();
	return false;
	});

	$('#edit-recurrence-enddate').datepicker(datepicker_settings).click(function(){ $("#edit-recurrence-repeat-until").prop('checked', true) });
	$('#edit-recurrence-repeat-times').change(function(e){ $('#edit-recurrence-repeat-count').prop('checked', true); });
	$('#edit-recurrence-rdate-input').datepicker(datepicker_settings);
	};

	/**
	* Set recurrence form according to the given event/task record
	*/
	this.set_recurrence_edit = function(rec)
	{
	var recurrence = $('#edit-recurrence-frequency').val(rec.recurrence ? rec.recurrence.FREQ \|\| (rec.recurrence.RDATE ? 'RDATE' : '') : '').change(),
	interval = $('.recurrence-form select.edit-recurrence-interval').val(rec.recurrence ? rec.recurrence.INTERVAL \|\| 1 : 1),
	rrtimes = $('#edit-recurrence-repeat-times').val(rec.recurrence ? rec.recurrence.COUNT \|\| 1 : 1),
	rrenddate = $('#edit-recurrence-enddate').val(rec.recurrence && rec.recurrence.UNTIL ? this.format_datetime(this.parseISO8601(rec.recurrence.UNTIL), 1) : '');
	$('.recurrence-form input.edit-recurrence-until:checked').prop('checked', false);
	$('#edit-recurrence-rdates').html('');

	var weekdays = ['SU','MO','TU','WE','TH','FR','SA'],
	rrepeat_id = '#edit-recurrence-repeat-forever';
	if (rec.recurrence && rec.recurrence.COUNT) rrepeat_id = '#edit-recurrence-repeat-count';
	else if (rec.recurrence && rec.recurrence.UNTIL) rrepeat_id = '#edit-recurrence-repeat-until';
	$(rrepeat_id).prop('checked', true);

	if (rec.recurrence && rec.recurrence.BYDAY && rec.recurrence.FREQ == 'WEEKLY') {
	var wdays = rec.recurrence.BYDAY.split(',');
	$('input.edit-recurrence-weekly-byday').val(wdays);
	}
	if (rec.recurrence && rec.recurrence.BYMONTHDAY) {
	$('input.edit-recurrence-monthly-bymonthday').val(String(rec.recurrence.BYMONTHDAY).split(','));
	$('input.edit-recurrence-monthly-mode').val(['BYMONTHDAY']);
	}
	if (rec.recurrence && rec.recurrence.BYDAY && (rec.recurrence.FREQ == 'MONTHLY' \|\| rec.recurrence.FREQ == 'YEARLY')) {
	var byday, section = rec.recurrence.FREQ.toLowerCase();
	if ((byday = String(rec.recurrence.BYDAY).match(/(-?[1-4])([A-Z]+)/))) {
	$('#edit-recurrence-'+section+'-prefix').val(byday[1]);
	$('#edit-recurrence-'+section+'-byday').val(byday[2]);
	}
	$('input.edit-recurrence-'+section+'-mode').val(['BYDAY']);
	}
	else if (rec.start) {
	$('#edit-recurrence-monthly-byday').val(weekdays[rec.start.getDay()]);
	}
	if (rec.recurrence && rec.recurrence.BYMONTH) {
	$('input.edit-recurrence-yearly-bymonth').val(String(rec.recurrence.BYMONTH).split(','));
	}
	else if (rec.start) {
	$('input.edit-recurrence-yearly-bymonth').val([String(rec.start.getMonth()+1)]);
	}
	if (rec.recurrence && rec.recurrence.RDATE) {
	$.each(rec.recurrence.RDATE, function(i,rdate){
	me.add_rdate(me.parseISO8601(rdate));
	});
	}
	};

	/**
	* Gather recurrence settings from form
	*/
	this.serialize_recurrence = function(timestr)
	{
	var recurrence = '',
	freq = $('#edit-recurrence-frequency').val();

	if (freq != '') {
	recurrence = {
	FREQ: freq,
	INTERVAL: $('#edit-recurrence-interval-'+freq.toLowerCase()).val()
	};

	var until = $('input.edit-recurrence-until:checked').val();
	if (until == 'count')
	recurrence.COUNT = $('#edit-recurrence-repeat-times').val();
	else if (until == 'until')
	recurrence.UNTIL = me.date2ISO8601(me.parse_datetime(timestr \|\| '00:00', $('#edit-recurrence-enddate').val()));

	if (freq == 'WEEKLY') {
	var byday = [];
	$('input.edit-recurrence-weekly-byday:checked').each(function(){ byday.push(this.value); });
	if (byday.length)
	recurrence.BYDAY = byday.join(',');
	}
	else if (freq == 'MONTHLY') {
	var mode = $('input.edit-recurrence-monthly-mode:checked').val(), bymonday = [];
	if (mode == 'BYMONTHDAY') {
	$('input.edit-recurrence-monthly-bymonthday:checked').each(function(){ bymonday.push(this.value); });
	if (bymonday.length)
	recurrence.BYMONTHDAY = bymonday.join(',');
	}
	else
	recurrence.BYDAY = $('#edit-recurrence-monthly-prefix').val() + $('#edit-recurrence-monthly-byday').val();
	}
	else if (freq == 'YEARLY') {
	var byday, bymonth = [];
	$('input.edit-recurrence-yearly-bymonth:checked').each(function(){ bymonth.push(this.value); });
	if (bymonth.length)
	recurrence.BYMONTH = bymonth.join(',');
	if ((byday = $('#edit-recurrence-yearly-byday').val()))
	recurrence.BYDAY = $('#edit-recurrence-yearly-prefix').val() + byday;
	}
	else if (freq == 'RDATE') {
	recurrence = { RDATE:[] };
	// take selected but not yet added date into account
	if ($('#edit-recurrence-rdate-input').val() != '') {
	$('#recurrence-form-rdate input.button.add').click();
	}
	$('#edit-recurrence-rdates li').each(function(i, li){
	recurrence.RDATE.push($(li).attr('data-value'));
	});
	}
	}

	return recurrence;
	};

	// add the given date to the RDATE list
	this.add_rdate = function(date)
	{
	var li = $('<li>')
	.attr('data-value', this.date2ISO8601(date))
	.html('<span>' + Q(this.format_datetime(date, 1)) + '</span>')
	.appendTo('#edit-recurrence-rdates');

	$('<a>').attr('href', '#del')
	.addClass('iconbutton delete')
	.html(rcmail.get_label('delete', 'libcalendaring'))
	.attr('title', rcmail.get_label('delete', 'libcalendaring'))
	.appendTo(li);
	};

	// re-sort the list items by their 'data-value' attribute
	this.sort_rdates = function()
	{
	var mylist = $('#edit-recurrence-rdates'),
	listitems = mylist.children('li').get();
	listitems.sort(function(a, b) {
	var compA = $(a).attr('data-value');
	var compB = $(b).attr('data-value');
	return (compA < compB) ? -1 : (compA > compB) ? 1 : 0;
	})
	$.each(listitems, function(idx, item) { mylist.append(item); });
	};


	/*** Attendee form handling ***/

	// expand the given contact group into individual event/task attendees
	this.expand_attendee_group = function(e, add, remove)
	{
	var id = (e.data ? e.data.email : null) \|\| $(e.target).attr('data-email'),
	role_select = $(e.target).closest('tr').find('select.edit-attendee-role option:selected');

	this.group2expand[id] = { link: e.target, data: $.extend({}, e.data \|\| {}), adder: add, remover: remove }

	// copy group role from the according form element
	if (role_select.length) {
	this.group2expand[id].data.role = role_select.val();
	}

	// register callback handler
	if (!this._expand_attendee_listener) {
	this._expand_attendee_listener = this.expand_attendee_callback;
	rcmail.addEventListener('plugin.expand_attendee_callback', function(result) {
	me._expand_attendee_listener(result);
	});
	}

	rcmail.http_post('libcal/plugin.expand_attendee_group', { id: id, data: e.data \|\| {} }, rcmail.set_busy(true, 'loading'));
	};

	// callback from server to expand an attendee group
	this.expand_attendee_callback = function(result)
	{
	var attendee, id = result.id,
	data = this.group2expand[id],
	row = $(data.link).closest('tr');

	// replace group entry with all members returned by the server
	if (data && data.adder && result.members && result.members.length) {
	for (var i=0; i < result.members.length; i++) {
	attendee = result.members[i];
	attendee.role = data.data.role;
	attendee.cutype = 'INDIVIDUAL';
	attendee.status = 'NEEDS-ACTION';
	data.adder(attendee, null, row);
	}

	if (data.remover) {
	data.remover(data.link, id)
	}
	else {
	row.remove();
	}

	delete this.group2expand[id];
	}
	else {
	rcmail.display_message(result.error \|\| rcmail.gettext('expandattendeegroupnodata','libcalendaring'), 'error');
	}
	};


	// Render message reference links to the given container
	this.render_message_links = function(links, container, edit, plugin)
	{
	var ul = $('<ul>').addClass('attachmentslist');

	$.each(links, function(i, link) {
	if (!link.mailurl)
	return true; // continue

	var li = $('<li>').addClass('link')
	.addClass('message eml')
	.append($('<a>')
	.attr('href', link.mailurl)
	.addClass('messagelink')
	.text(link.subject \|\| link.uri)
	)
	.appendTo(ul);

	// add icon to remove the link
	if (edit) {
	$('<a>')
	.attr('href', '#delete')
	.attr('title', rcmail.gettext('removelink', plugin))
	.attr('data-uri', link.uri)
	.addClass('delete')
	.text(rcmail.gettext('delete'))
	.appendTo(li);
	}
	});

	container.empty().append(ul);
	}
	}

	////// static methods

	// render HTML code for displaying an attendee record
	rcube_libcalendaring.attendee_html = function(data)
	{
	var name, tooltip = '', context = 'libcalendaring',
	dispname = data.name \|\| data.email,
	status = data.role == 'ORGANIZER' ? 'ORGANIZER' : data.status;

	if (status)
	status = status.toLowerCase();

	if (data.email) {
	tooltip = data.email;
	name = $('<a>').attr({href: 'mailto:' + data.email, 'class': 'mailtolink', 'data-cutype': data.cutype})

	if (status)
	tooltip += ' (' + rcmail.gettext('status' + status, context) + ')';
	}
	else {
	name = $('<span>');
	}

	if (data['delegated-to'])
	- tooltip = rcmail.gettext('delegatedto', context) + data['delegated-to'];
	+ tooltip = rcmail.gettext('delegatedto', context) + ' ' + data['delegated-to'];
	else if (data['delegated-from'])
	- tooltip = rcmail.gettext('delegatedfrom', context) + data['delegated-from'];
	+ tooltip = rcmail.gettext('delegatedfrom', context) + ' ' + data['delegated-from'];

	return $('<span>').append(
	$('<span>').attr({'class': 'attendee ' + status, title: tooltip}).append(name.text(dispname))
	).html();
	};

	/**
	*
	*/
	rcube_libcalendaring.add_from_itip_mail = function(mime_id, task, status, dom_id)
	{
	// ask user to delete the declined event from the local calendar (#1670)
	var del = false;
	if (rcmail.env.rsvp_saved && status == 'declined') {
	del = confirm(rcmail.gettext('itip.declinedeleteconfirm'));
	}

	// open dialog for iTip delegation
	if (status == 'delegated') {
	rcube_libcalendaring.itip_delegate_dialog(function(data) {
	rcmail.http_post(task + '/itip-delegate', {
	_uid: rcmail.env.uid,
	_mbox: rcmail.env.mailbox,
	_part: mime_id,
	_to: data.to,
	_rsvp: data.rsvp ? 1 : 0,
	_comment: data.comment,
	_folder: data.target
	}, rcmail.set_busy(true, 'itip.savingdata'));
	}, $('#rsvp-'+dom_id+' .folder-select'));
	return false;
	}

	var noreply = 0, comment = '';
	if (dom_id) {
	noreply = $('#noreply-'+dom_id+':checked').length ? 1 : 0;
	if (!noreply)
	comment = $('#reply-comment-'+dom_id).val();
	}

	rcmail.http_post(task + '/mailimportitip', {
	_uid: rcmail.env.uid,
	_mbox: rcmail.env.mailbox,
	_part: mime_id,
	_folder: $('#itip-saveto').val(),
	_status: status,
	_del: del?1:0,
	_noreply: noreply,
	_comment: comment
	}, rcmail.set_busy(true, 'itip.savingdata'));

	return false;
	};

	/**
	* Helper function to render the iTip delegation dialog
	* and trigger a callback function when submitted.
	*/
	rcube_libcalendaring.itip_delegate_dialog = function(callback, selector)
	{
	// show dialog for entering the delegatee address and comment
	var html = '<form class="itip-dialog-form" action="javascript:void()">' +
	'<div class="form-section">' +
	'<label for="itip-delegate-to">' + rcmail.gettext('itip.delegateto') + '</label><br/>' +
	'<input type="text" id="itip-delegate-to" class="text" size="40" value="" />' +
	'</div>' +
	'<div class="form-section">' +
	'<label for="itip-delegate-rsvp">' +
	'<input type="checkbox" id="itip-delegate-rsvp" class="checkbox" size="40" value="" />' +
	rcmail.gettext('itip.delegatersvpme') +
	'</label>' +
	'</div>' +
	'<div class="form-section">' +
	'<textarea id="itip-delegate-comment" class="itip-comment" cols="40" rows="8" placeholder="' +
	rcmail.gettext('itip.itipcomment') + '"></textarea>' +
	'</div>' +
	'<div class="form-section">' +
	(selector && selector.length ? selector.html() : '') +
	'</div>' +
	'</form>';

	var dialog, buttons = [];
	buttons.push({
	text: rcmail.gettext('itipdelegated', 'itip'),
	click: function() {
	var doc = window.parent.document,
	delegatee = String($('#itip-delegate-to', doc).val()).replace(/(^\s+)\|(\s+$)/, '');

	if (delegatee != '' && rcube_check_email(delegatee, true)) {
	callback({
	to: delegatee,
	rsvp: $('#itip-delegate-rsvp', doc).prop('checked'),
	comment: $('#itip-delegate-comment', doc).val(),
	target: $('#itip-saveto', doc).val()
	});

	setTimeout(function() { dialog.dialog("close"); }, 500);
	}
	else {
	alert(rcmail.gettext('itip.delegateinvalidaddress'));
	$('#itip-delegate-to', doc).focus();
	}
	}
	});

	buttons.push({
	text: rcmail.gettext('cancel', 'itip'),
	click: function() {
	dialog.dialog('close');
	}
	});

	dialog = rcmail.show_popup_dialog(html, rcmail.gettext('delegateinvitation', 'itip'), buttons, {
	width: 460,
	open: function(event, ui) {
	$(this).parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().addClass('mainaction');
	$(this).find('#itip-saveto').val('');

	// initialize autocompletion
	var ac_props, rcm = rcmail.is_framed() ? parent.rcmail : rcmail;
	if (rcmail.env.autocomplete_threads > 0) {
	ac_props = {
	threads: rcmail.env.autocomplete_threads,
	sources: rcmail.env.autocomplete_sources
	};
	}
	rcm.init_address_input_events($(this).find('#itip-delegate-to').focus(), ac_props);
	rcm.env.recipients_delimiter = '';
	},
	close: function(event, ui) {
	rcm = rcmail.is_framed() ? parent.rcmail : rcmail;
	rcm.ksearch_blur();
	$(this).remove();
	}
	});

	return dialog;
	};

	/**
	* Show a menu for selecting the RSVP reply mode
	*/
	rcube_libcalendaring.itip_rsvp_recurring = function(btn, callback)
	{
	var mnu = $('<ul></ul>').addClass('popupmenu libcal-rsvp-replymode');

	$.each(['all','current'/,'future'/], function(i, mode) {
	$('<li><a>' + rcmail.get_label('rsvpmode'+mode, 'libcalendaring') + '</a>')
	.addClass('ui-menu-item')
	.attr('rel', mode)
	.appendTo(mnu);
	});

	var action = btn.attr('rel');

	// open the mennu
	mnu.menu({
	select: function(event, ui) {
	callback(action, ui.item.attr('rel'));
	}
	})
	.appendTo(document.body)
	.position({ my: 'left top', at: 'left bottom+2', of: btn })
	.data('action', action);

	setTimeout(function() {
	$(document).one('click', function() {
	mnu.menu('destroy');
	mnu.remove();
	});
	}, 100);
	};

	/**
	*
	*/
	rcube_libcalendaring.remove_from_itip = function(event, task, title)
	{
	if (confirm(rcmail.gettext('itip.deleteobjectconfirm').replace('$title', title))) {
	rcmail.http_post(task + '/itip-remove',
	event,
	rcmail.set_busy(true, 'itip.savingdata')
	);
	}
	};

	/**
	*
	*/
	rcube_libcalendaring.decline_attendee_reply = function(mime_id, task)
	{
	// show dialog for entering a comment and send to server
	var html = '<div class="itip-dialog-confirm-text">' + rcmail.gettext('itip.declineattendeeconfirm') + '</div>' +
	'<textarea id="itip-decline-comment" class="itip-comment" cols="40" rows="8"></textarea>';

	var dialog, buttons = [];
	buttons.push({
	text: rcmail.gettext('declineattendee', 'itip'),
	click: function() {
	rcmail.http_post(task + '/itip-decline-reply', {
	_uid: rcmail.env.uid,
	_mbox: rcmail.env.mailbox,
	_part: mime_id,
	_comment: $('#itip-decline-comment', window.parent.document).val()
	}, rcmail.set_busy(true, 'itip.savingdata'));
	dialog.dialog("close");
	}
	});

	buttons.push({
	text: rcmail.gettext('cancel', 'itip'),
	click: function() {
	dialog.dialog('close');
	}
	});

	dialog = rcmail.show_popup_dialog(html, rcmail.gettext('declineattendee', 'itip'), buttons, {
	width: 460,
	open: function() {
	$(this).parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().addClass('mainaction');
	$('#itip-decline-comment').focus();
	}
	});

	return false;
	};

	/**
	*
	*/
	rcube_libcalendaring.fetch_itip_object_status = function(p)
	{
	rcmail.http_post(p.task + '/itip-status', { data: p });
	};

	/**
	*
	*/
	rcube_libcalendaring.update_itip_object_status = function(p)
	{
	rcmail.env.rsvp_saved = p.saved;
	rcmail.env.itip_existing = p.existing;

	// hide all elements first
	$('#itip-buttons-'+p.id+' > div').hide();
	$('#rsvp-'+p.id+' .folder-select').remove();

	if (p.html) {
	// append/replace rsvp status display
	$('#loading-'+p.id).next('.rsvp-status').remove();
	$('#loading-'+p.id).hide().after(p.html);
	}

	// enable/disable rsvp buttons
	if (p.action == 'rsvp') {
	$('#rsvp-'+p.id+' input.button').prop('disabled', false)
	.filter('.'+String(p.status\|\|'unknown').toLowerCase()).prop('disabled', p.latest);
	}

	// show rsvp/import buttons (with calendar selector)
	$('#'+p.action+'-'+p.id).show().find('input.button').last().after(p.select);

	// show itip box appendix after replacing the given placeholders
	if (p.append && p.append.selector) {
	var elem = $(p.append.selector);
	if (p.append.replacements) {
	$.each(p.append.replacements, function(k, html) {
	elem.html(elem.html().replace(k, html));
	});
	}
	else if (p.append.html) {
	elem.html(p.append.html)
	}
	elem.show();
	}
	};

	/**
	* Callback from server after an iTip message has been processed
	*/
	rcube_libcalendaring.itip_message_processed = function(metadata)
	{
	if (metadata.after_action) {
	setTimeout(function(){ rcube_libcalendaring.itip_after_action(metadata.after_action); }, 1200);
	}
	else {
	rcube_libcalendaring.fetch_itip_object_status(metadata);
	}
	};

	/**
	* After-action on iTip request message. Action types:
	* 0 - no action
	* 1 - move to Trash
	* 2 - delete the message
	* 3 - flag as deleted
	* folder_name - move the message to the specified folder
	*/
	rcube_libcalendaring.itip_after_action = function(action)
	{
	if (!action) {
	return;
	}

	var rc = rcmail.is_framed() ? parent.rcmail : rcmail;

	if (action === 2) {
	rc.permanently_remove_messages();
	}
	else if (action === 3) {
	rc.mark_message('delete');
	}
	else {
	rc.move_messages(action === 1 ? rc.env.trash_mailbox : action);
	}
	};

	/**
	* Open the calendar preview for the current iTip event
	*/
	rcube_libcalendaring.open_itip_preview = function(url, msgref)
	{
	if (!rcmail.env.itip_existing)
	url += '&itip=' + escape(msgref);

	var win = rcmail.open_window(url);
	};


	// extend jQuery
	(function($){
	$.fn.serializeJSON = function(){
	var json = {};
	jQuery.map($(this).serializeArray(), function(n, i) {
	json[n['name']] = n['value'];
	});
	return json;
	};
	})(jQuery);


	/* libcalendaring plugin initialization */
	window.rcmail && rcmail.addEventListener('init', function(evt) {
	if (rcmail.env.libcal_settings) {
	var libcal = new rcube_libcalendaring(rcmail.env.libcal_settings);
	rcmail.addEventListener('plugin.display_alarms', function(alarms){ libcal.display_alarms(alarms); });
	}

	rcmail.addEventListener('plugin.update_itip_object_status', rcube_libcalendaring.update_itip_object_status)
	.addEventListener('plugin.fetch_itip_object_status', rcube_libcalendaring.fetch_itip_object_status)
	.addEventListener('plugin.itip_message_processed', rcube_libcalendaring.itip_message_processed);

	$('.rsvp-buttons').on('click', 'a.reply-comment-toggle', function(e){
	$(this).hide().parent().find('textarea').show().focus();
	return false;
	});

	if (rcmail.env.action == 'get-attachment' && rcmail.gui_objects['attachmentframe']) {
	rcmail.register_command('print-attachment', function() {
	var frame = rcmail.get_frame_window(rcmail.gui_objects['attachmentframe'].id);
	if (frame) frame.print();
	}, true);
	}

	if (rcmail.env.action == 'get-attachment' && rcmail.env.attachment_download_url) {
	rcmail.register_command('download-attachment', function() {
	rcmail.location_href(rcmail.env.attachment_download_url, window);
	}, true);
	}
	});
	diff --git a/plugins/libcalendaring/libcalendaring.php b/plugins/libcalendaring/libcalendaring.php
	index 92618b02..df12002a 100644
	--- a/plugins/libcalendaring/libcalendaring.php
	+++ b/plugins/libcalendaring/libcalendaring.php
	@@ -1,1747 +1,1748 @@
	<?php

	/**
	* Library providing common functions for calendaring plugins
	*
	* Provides utility functions for calendar-related modules such as
	* - alarms display and dismissal
	* - attachment handling
	* - recurrence computation and UI elements
	* - ical parsing and exporting
	* - itip scheduling protocol
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2012-2015, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	class libcalendaring extends rcube_plugin
	{
	public $rc;
	public $timezone;
	public $gmt_offset;
	public $dst_active;
	public $timezone_offset;
	public $ical_parts = array();
	public $ical_message;

	public $defaults = array(
	'calendar_date_format' => "yyyy-MM-dd",
	'calendar_date_short' => "M-d",
	'calendar_date_long' => "MMM d yyyy",
	'calendar_date_agenda' => "ddd MM-dd",
	'calendar_time_format' => "HH:mm",
	'calendar_first_day' => 1,
	'calendar_first_hour' => 6,
	'calendar_date_format_sets' => array(
	'yyyy-MM-dd' => array('MMM d yyyy', 'M-d', 'ddd MM-dd'),
	'dd-MM-yyyy' => array('d MMM yyyy', 'd-M', 'ddd dd-MM'),
	'yyyy/MM/dd' => array('MMM d yyyy', 'M/d', 'ddd MM/dd'),
	'MM/dd/yyyy' => array('MMM d yyyy', 'M/d', 'ddd MM/dd'),
	'dd/MM/yyyy' => array('d MMM yyyy', 'd/M', 'ddd dd/MM'),
	'dd.MM.yyyy' => array('dd. MMM yyyy', 'd.M', 'ddd dd.MM.'),
	'd.M.yyyy' => array('d. MMM yyyy', 'd.M', 'ddd d.MM.'),
	),
	);

	private static $instance;

	private $mail_ical_parser;

	/**
	* Singleton getter to allow direct access from other plugins
	*/
	public static function get_instance()
	{
	if (!self::$instance) {
	self::$instance = new libcalendaring(rcube::get_instance()->plugins);
	self::$instance->init_instance();
	}

	return self::$instance;
	}

	/**
	* Initializes class properties
	*/
	public function init_instance()
	{
	$this->rc = rcube::get_instance();

	// set user's timezone
	try {
	$this->timezone = new DateTimeZone($this->rc->config->get('timezone', 'GMT'));
	}
	catch (Exception $e) {
	$this->timezone = new DateTimeZone('GMT');
	}

	$now = new DateTime('now', $this->timezone);

	$this->gmt_offset = $now->getOffset();
	$this->dst_active = $now->format('I');
	$this->timezone_offset = $this->gmt_offset / 3600 - $this->dst_active;

	$this->add_texts('localization/', false);
	}

	/**
	* Required plugin startup method
	*/
	public function init()
	{
	self::$instance = $this;

	$this->rc = rcube::get_instance();
	$this->init_instance();

	// include client scripts and styles
	if ($this->rc->output) {
	// add hook to display alarms
	$this->add_hook('refresh', array($this, 'refresh'));
	$this->register_action('plugin.alarms', array($this, 'alarms_action'));
	$this->register_action('plugin.expand_attendee_group', array($this, 'expand_attendee_group'));
	}

	// proceed initialization in startup hook
	$this->add_hook('startup', array($this, 'startup'));
	}

	/**
	* Startup hook
	*/
	public function startup($args)
	{
	if ($this->rc->output && $this->rc->output->type == 'html') {
	$this->rc->output->set_env('libcal_settings', $this->load_settings());
	$this->include_script('libcalendaring.js');
	$this->include_stylesheet($this->local_skin_path() . '/libcal.css');

	- $this->rc->output->add_label(
	- 'libcalendaring.itipaccepted', 'libcalendaring.itiptentative', 'libcalendaring.itipdeclined',
	- 'libcalendaring.itipdelegated', 'libcalendaring.expandattendeegroup', 'libcalendaring.expandattendeegroupnodata',
	- 'libcalendaring.statusorganizer', 'libcalendaring.statusaccepted', 'libcalendaring.statusdeclined',
	- 'libcalendaring.statusdelegated', 'libcalendaring.statusunknown', 'libcalendaring.statusneeds-action',
	- 'libcalendaring.statustentative', 'libcalendaring.statuscompleted', 'libcalendaring.statusin-process'
	+ $this->add_label(
	+ 'itipaccepted', 'itiptentative', 'itipdeclined',
	+ 'itipdelegated', 'expandattendeegroup', 'expandattendeegroupnodata',
	+ 'statusorganizer', 'statusaccepted', 'statusdeclined',
	+ 'statusdelegated', 'statusunknown', 'statusneeds-action',
	+ 'statustentative', 'statuscompleted', 'statusin-process',
	+ 'delegatedto', 'delegatedfrom'
	);
	}

	if ($args['task'] == 'mail') {
	if ($args['action'] == 'show' \|\| $args['action'] == 'preview') {
	$this->add_hook('message_load', array($this, 'mail_message_load'));
	}
	}
	}

	/**
	* Load iCalendar functions
	*/
	public static function get_ical()
	{
	$self = self::get_instance();
	require_once __DIR__ . '/libvcalendar.php';
	return new libvcalendar();
	}

	/**
	* Load iTip functions
	*/
	public static function get_itip($domain = 'libcalendaring')
	{
	$self = self::get_instance();
	require_once __DIR__ . '/lib/libcalendaring_itip.php';
	return new libcalendaring_itip($self, $domain);
	}

	/**
	* Load recurrence computation engine
	*/
	public static function get_recurrence()
	{
	$self = self::get_instance();
	require_once __DIR__ . '/lib/libcalendaring_recurrence.php';
	return new libcalendaring_recurrence($self);
	}

	/**
	* Shift dates into user's current timezone
	*
	* @param mixed Any kind of a date representation (DateTime object, string or unix timestamp)
	* @return object DateTime object in user's timezone
	*/
	public function adjust_timezone($dt, $dateonly = false)
	{
	if (is_numeric($dt))
	$dt = new DateTime('@'.$dt);
	else if (is_string($dt))
	$dt = rcube_utils::anytodatetime($dt);

	if ($dt instanceof DateTime && !($dt->_dateonly \|\| $dateonly)) {
	$dt->setTimezone($this->timezone);
	}

	return $dt;
	}


	/**
	*
	*/
	public function load_settings()
	{
	$this->date_format_defaults();

	$settings = array();
	$keys = array('date_format', 'time_format', 'date_short', 'date_long');

	foreach ($keys as $key) {
	$settings[$key] = (string)$this->rc->config->get('calendar_' . $key, $this->defaults['calendar_' . $key]);
	$settings[$key] = str_replace('Y', 'y', $settings[$key]);
	}

	$settings['dates_long'] = str_replace(' yyyy', '[ yyyy]', $settings['date_long']) . "{ '—' " . $settings['date_long'] . '}';
	$settings['first_day'] = (int)$this->rc->config->get('calendar_first_day', $this->defaults['calendar_first_day']);
	$settings['timezone'] = $this->timezone_offset;
	$settings['dst'] = $this->dst_active;

	// localization
	$settings['days'] = array(
	$this->rc->gettext('sunday'), $this->rc->gettext('monday'),
	$this->rc->gettext('tuesday'), $this->rc->gettext('wednesday'),
	$this->rc->gettext('thursday'), $this->rc->gettext('friday'),
	$this->rc->gettext('saturday')
	);
	$settings['days_short'] = array(
	$this->rc->gettext('sun'), $this->rc->gettext('mon'),
	$this->rc->gettext('tue'), $this->rc->gettext('wed'),
	$this->rc->gettext('thu'), $this->rc->gettext('fri'),
	$this->rc->gettext('sat')
	);
	$settings['months'] = array(
	$this->rc->gettext('longjan'), $this->rc->gettext('longfeb'),
	$this->rc->gettext('longmar'), $this->rc->gettext('longapr'),
	$this->rc->gettext('longmay'), $this->rc->gettext('longjun'),
	$this->rc->gettext('longjul'), $this->rc->gettext('longaug'),
	$this->rc->gettext('longsep'), $this->rc->gettext('longoct'),
	$this->rc->gettext('longnov'), $this->rc->gettext('longdec')
	);
	$settings['months_short'] = array(
	$this->rc->gettext('jan'), $this->rc->gettext('feb'),
	$this->rc->gettext('mar'), $this->rc->gettext('apr'),
	$this->rc->gettext('may'), $this->rc->gettext('jun'),
	$this->rc->gettext('jul'), $this->rc->gettext('aug'),
	$this->rc->gettext('sep'), $this->rc->gettext('oct'),
	$this->rc->gettext('nov'), $this->rc->gettext('dec')
	);
	$settings['today'] = $this->rc->gettext('today');

	// define list of file types which can be displayed inline
	// same as in program/steps/mail/show.inc
	$settings['mimetypes'] = (array)$this->rc->config->get('client_mimetypes');

	return $settings;
	}


	/**
	* Helper function to set date/time format according to config and user preferences
	*/
	private function date_format_defaults()
	{
	static $defaults = array();

	// nothing to be done
	if (isset($defaults['date_format']))
	return;

	$defaults['date_format'] = $this->rc->config->get('calendar_date_format', self::from_php_date_format($this->rc->config->get('date_format')));
	$defaults['time_format'] = $this->rc->config->get('calendar_time_format', self::from_php_date_format($this->rc->config->get('time_format')));

	// override defaults
	if ($defaults['date_format'])
	$this->defaults['calendar_date_format'] = $defaults['date_format'];
	if ($defaults['time_format'])
	$this->defaults['calendar_time_format'] = $defaults['time_format'];

	// derive format variants from basic date format
	$format_sets = $this->rc->config->get('calendar_date_format_sets', $this->defaults['calendar_date_format_sets']);
	if ($format_set = $format_sets[$this->defaults['calendar_date_format']]) {
	$this->defaults['calendar_date_long'] = $format_set[0];
	$this->defaults['calendar_date_short'] = $format_set[1];
	$this->defaults['calendar_date_agenda'] = $format_set[2];
	}
	}

	/**
	* Compose a date string for the given event
	*/
	public function event_date_text($event, $tzinfo = false)
	{
	$fromto = '--';

	// handle task objects
	if ($event['_type'] == 'task' && is_object($event['due'])) {
	$date_format = $event['due']->_dateonly ? self::to_php_date_format($this->rc->config->get('calendar_date_format', $this->defaults['calendar_date_format'])) : null;
	$fromto = $this->rc->format_date($event['due'], $date_format, false);

	// add timezone information
	if ($fromto && $tzinfo && ($tzname = $this->timezone->getName())) {
	$fromto .= ' (' . strtr($tzname, '_', ' ') . ')';
	}

	return $fromto;
	}

	// abort if no valid event dates are given
	if (!is_object($event['start']) \|\| !is_a($event['start'], 'DateTime') \|\| !is_object($event['end']) \|\| !is_a($event['end'], 'DateTime')) {
	return $fromto;
	}

	$duration = $event['start']->diff($event['end'])->format('s');

	$this->date_format_defaults();
	$date_format = self::to_php_date_format($this->rc->config->get('calendar_date_format', $this->defaults['calendar_date_format']));
	$time_format = self::to_php_date_format($this->rc->config->get('calendar_time_format', $this->defaults['calendar_time_format']));

	if ($event['allday']) {
	$fromto = $this->rc->format_date($event['start'], $date_format);
	if (($todate = $this->rc->format_date($event['end'], $date_format)) != $fromto)
	$fromto .= ' - ' . $todate;
	}
	else if ($duration < 86400 && $event['start']->format('d') == $event['end']->format('d')) {
	$fromto = $this->rc->format_date($event['start'], $date_format) . ' ' . $this->rc->format_date($event['start'], $time_format) .
	' - ' . $this->rc->format_date($event['end'], $time_format);
	}
	else {
	$fromto = $this->rc->format_date($event['start'], $date_format) . ' ' . $this->rc->format_date($event['start'], $time_format) .
	' - ' . $this->rc->format_date($event['end'], $date_format) . ' ' . $this->rc->format_date($event['end'], $time_format);
	}

	// add timezone information
	if ($tzinfo && ($tzname = $this->timezone->getName())) {
	$fromto .= ' (' . strtr($tzname, '_', ' ') . ')';
	}

	return $fromto;
	}


	/**
	* Render HTML form for alarm configuration
	*/
	public function alarm_select($attrib, $alarm_types, $absolute_time = true)
	{
	unset($attrib['name']);

	$input_value = new html_inputfield(array('name' => 'alarmvalue[]', 'class' => 'edit-alarm-value', 'size' => 3));
	$input_date = new html_inputfield(array('name' => 'alarmdate[]', 'class' => 'edit-alarm-date', 'size' => 10));
	$input_time = new html_inputfield(array('name' => 'alarmtime[]', 'class' => 'edit-alarm-time', 'size' => 6));
	$select_type = new html_select(array('name' => 'alarmtype[]', 'class' => 'edit-alarm-type', 'id' => $attrib['id']));
	$select_offset = new html_select(array('name' => 'alarmoffset[]', 'class' => 'edit-alarm-offset'));
	$select_related = new html_select(array('name' => 'alarmrelated[]', 'class' => 'edit-alarm-related'));
	$object_type = $attrib['_type'] ?: 'event';

	$select_type->add($this->gettext('none'), '');
	foreach ($alarm_types as $type)
	$select_type->add($this->gettext(strtolower("alarm{$type}option")), $type);

	foreach (array('-M','-H','-D','+M','+H','+D') as $trigger)
	$select_offset->add($this->gettext('trigger' . $trigger), $trigger);

	$select_offset->add($this->gettext('trigger0'), '0');
	if ($absolute_time)
	$select_offset->add($this->gettext('trigger@'), '@');

	$select_related->add($this->gettext('relatedstart'), 'start');
	$select_related->add($this->gettext('relatedend' . $object_type), 'end');

	// pre-set with default values from user settings
	$preset = self::parse_alarm_value($this->rc->config->get('calendar_default_alarm_offset', '-15M'));
	$hidden = array('style' => 'display:none');
	$html = html::span('edit-alarm-set',
	$select_type->show($this->rc->config->get('calendar_default_alarm_type', '')) . ' ' .
	html::span(array('class' => 'edit-alarm-values', 'style' => 'display:none'),
	$input_value->show($preset[0]) . ' ' .
	$select_offset->show($preset[1]) . ' ' .
	$select_related->show() . ' ' .
	$input_date->show('', $hidden) . ' ' .
	$input_time->show('', $hidden)
	)
	);

	// TODO: support adding more alarms
	#$html .= html::a(array('href' => '#', 'id' => 'edit-alam-add', 'title' => $this->gettext('addalarm')),
	# $attrib['addicon'] ? html::img(array('src' => $attrib['addicon'], 'alt' => 'add')) : '(+)');

	return $html;
	}

	/**
	* Get a list of email addresses of the given user (from login and identities)
	*
	* @param string User Email (default to current user)
	* @return array Email addresses related to the user
	*/
	public function get_user_emails($user = null)
	{
	static $_emails = array();

	if (empty($user)) {
	$user = $this->rc->user->get_username();
	}

	// return cached result
	if (is_array($_emails[$user])) {
	return $_emails[$user];
	}

	$emails = array($user);
	$plugin = $this->rc->plugins->exec_hook('calendar_user_emails', array('emails' => $emails));
	$emails = array_map('strtolower', $plugin['emails']);

	// add all emails from the current user's identities
	if (!$plugin['abort'] && ($user == $this->rc->user->get_username())) {
	foreach ($this->rc->user->list_emails() as $identity) {
	$emails[] = strtolower($identity['email']);
	}
	}

	$_emails[$user] = array_unique($emails);
	return $_emails[$user];
	}

	/**
	* Set the given participant status to the attendee matching the current user's identities
	*
	* @param array Hash array with event struct
	* @param string The PARTSTAT value to set
	* @return mixed Email address of the updated attendee or False if none matching found
	*/
	public function set_partstat(&$event, $status, $recursive = true)
	{
	$success = false;
	$emails = $this->get_user_emails();
	foreach ((array)$event['attendees'] as $i => $attendee) {
	if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
	$event['attendees'][$i]['status'] = strtoupper($status);
	$success = $attendee['email'];
	}
	}

	// apply partstat update to each existing exception
	if ($event['recurrence'] && is_array($event['recurrence']['EXCEPTIONS'])) {
	foreach ($event['recurrence']['EXCEPTIONS'] as $i => $exception) {
	$this->set_partstat($event['recurrence']['EXCEPTIONS'][$i], $status, false);
	}

	// set link to top-level exceptions
	$event['exceptions'] = &$event['recurrence']['EXCEPTIONS'];
	}

	return $success;
	}


	/******* Alarms handling *******/

	/**
	* Helper function to convert alarm trigger strings
	* into two-field values (e.g. "-45M" => 45, "-M")
	*/
	public static function parse_alarm_value($val)
	{
	if ($val[0] == '@') {
	return array(new DateTime($val));
	}
	else if (preg_match('/([+-]?)P?(T?\d+[HMSDW])+/', $val, $m) && preg_match_all('/T?(\d+)([HMSDW])/', $val, $m2, PREG_SET_ORDER)) {
	if ($m[1] == '')
	$m[1] = '+';
	foreach ($m2 as $seg) {
	$prefix = $seg[2] == 'D' \|\| $seg[2] == 'W' ? 'P' : 'PT';
	if ($seg[1] > 0) { // ignore zero values
	// convert seconds to minutes
	if ($seg[2] == 'S') {
	$seg[2] = 'M';
	$seg[1] = max(1, round($seg[1]/60));
	}

	return array($seg[1], $m[1].$seg[2], $m[1].$seg[1].$seg[2], $m[1].$prefix.$seg[1].$seg[2]);
	}
	}

	// return zero value nevertheless
	return array($seg[1], $m[1].$seg[2], $m[1].$seg[1].$seg[2], $m[1].$prefix.$seg[1].$seg[2]);
	}

	return false;
	}

	/**
	* Convert the alarms list items to be processed on the client
	*/
	public static function to_client_alarms($valarms)
	{
	return array_map(function($alarm){
	if ($alarm['trigger'] instanceof DateTime) {
	$alarm['trigger'] = '@' . $alarm['trigger']->format('U');
	}
	else if ($trigger = libcalendaring::parse_alarm_value($alarm['trigger'])) {
	$alarm['trigger'] = $trigger[2];
	}
	return $alarm;
	}, (array)$valarms);
	}

	/**
	* Process the alarms values submitted by the client
	*/
	public static function from_client_alarms($valarms)
	{
	return array_map(function($alarm){
	if ($alarm['trigger'][0] == '@') {
	try {
	$alarm['trigger'] = new DateTime($alarm['trigger']);
	$alarm['trigger']->setTimezone(new DateTimeZone('UTC'));
	}
	catch (Exception $e) { /* handle this ? */ }
	}
	else if ($trigger = libcalendaring::parse_alarm_value($alarm['trigger'])) {
	$alarm['trigger'] = $trigger[3];
	}
	return $alarm;
	}, (array)$valarms);
	}

	/**
	* Render localized text for alarm settings
	*/
	public static function alarms_text($alarms)
	{
	if (is_array($alarms) && is_array($alarms[0])) {
	$texts = array();
	foreach ($alarms as $alarm) {
	if ($text = self::alarm_text($alarm))
	$texts[] = $text;
	}

	return join(', ', $texts);
	}
	else {
	return self::alarm_text($alarms);
	}
	}

	/**
	* Render localized text for a single alarm property
	*/
	public static function alarm_text($alarm)
	{
	if (is_string($alarm)) {
	list($trigger, $action) = explode(':', $alarm);
	}
	else {
	$trigger = $alarm['trigger'];
	$action = $alarm['action'];
	$related = $alarm['related'];
	}

	$text = '';
	$rcube = rcube::get_instance();

	switch ($action) {
	case 'EMAIL':
	$text = $rcube->gettext('libcalendaring.alarmemail');
	break;
	case 'DISPLAY':
	$text = $rcube->gettext('libcalendaring.alarmdisplay');
	break;
	case 'AUDIO':
	$text = $rcube->gettext('libcalendaring.alarmaudio');
	break;
	}

	if ($trigger instanceof DateTime) {
	$text .= ' ' . $rcube->gettext(array(
	'name' => 'libcalendaring.alarmat',
	'vars' => array('datetime' => $rcube->format_date($trigger))
	));
	}
	else if (preg_match('/@(\d+)/', $trigger, $m)) {
	$text .= ' ' . $rcube->gettext(array(
	'name' => 'libcalendaring.alarmat',
	'vars' => array('datetime' => $rcube->format_date($m[1]))
	));
	}
	else if ($val = self::parse_alarm_value($trigger)) {
	$r = strtoupper($related ?: 'start') == 'END' ? 'end' : '';
	// TODO: for all-day events say 'on date of event at XX' ?
	if ($val[0] == 0) {
	$text .= ' ' . $rcube->gettext('libcalendaring.triggerattime' . $r);
	}
	else {
	$label = 'libcalendaring.trigger' . $r . $val[1];
	$text .= ' ' . intval($val[0]) . ' ' . $rcube->gettext($label);
	}
	}
	else {
	return false;
	}

	return $text;
	}

	/**
	* Get the next alarm (time & action) for the given event
	*
	* @param array Record data
	* @return array Hash array with alarm time/type or null if no alarms are configured
	*/
	public static function get_next_alarm($rec, $type = 'event')
	{
	if (!($rec['valarms'] \|\| $rec['alarms']) \|\| $rec['cancelled'] \|\| $rec['status'] == 'CANCELLED')
	return null;

	if ($type == 'task') {
	$timezone = self::get_instance()->timezone;
	if ($rec['startdate'])
	$rec['start'] = new DateTime($rec['startdate'] . ' ' . ($rec['starttime'] ?: '12:00'), $timezone);
	if ($rec['date'])
	$rec[($rec['start'] ? 'end' : 'start')] = new DateTime($rec['date'] . ' ' . ($rec['time'] ?: '12:00'), $timezone);
	}

	if (!$rec['end'])
	$rec['end'] = $rec['start'];

	// support legacy format
	if (!$rec['valarms']) {
	list($trigger, $action) = explode(':', $rec['alarms'], 2);
	if ($alarm = self::parse_alarm_value($trigger)) {
	$rec['valarms'] = array(array('action' => $action, 'trigger' => $alarm[3] ?: $alarm[0]));
	}
	}

	$expires = new DateTime('now - 12 hours');
	$alarm_id = $rec['id']; // alarm ID eq. record ID by default to keep backwards compatibility

	// handle multiple alarms
	$notify_at = null;
	foreach ($rec['valarms'] as $alarm) {
	$notify_time = null;

	if ($alarm['trigger'] instanceof DateTime) {
	$notify_time = $alarm['trigger'];
	}
	else if (is_string($alarm['trigger'])) {
	$refdate = $alarm['related'] == 'END' ? $rec['end'] : $rec['start'];

	// abort if no reference date is available to compute notification time
	if (!is_a($refdate, 'DateTime'))
	continue;

	// TODO: for all-day events, take start @ 00:00 as reference date ?

	try {
	$interval = new DateInterval(trim($alarm['trigger'], '+-'));
	$interval->invert = $alarm['trigger'][0] == '-';
	$notify_time = clone $refdate;
	$notify_time->add($interval);
	}
	catch (Exception $e) {
	rcube::raise_error($e, true);
	continue;
	}
	}

	if ($notify_time && (!$notify_at \|\| ($notify_time > $notify_at && $notify_time > $expires))) {
	$notify_at = $notify_time;
	$action = $alarm['action'];
	$alarm_prop = $alarm;

	// generate a unique alarm ID if multiple alarms are set
	if (count($rec['valarms']) > 1) {
	$alarm_id = substr(md5($rec['id']), 0, 16) . '-' . $notify_at->format('Ymd\THis');
	}
	}
	}

	return !$notify_at ? null : array(
	'time' => $notify_at->format('U'),
	'action' => $action ? strtoupper($action) : 'DISPLAY',
	'id' => $alarm_id,
	'prop' => $alarm_prop,
	);
	}

	/**
	* Handler for keep-alive requests
	* This will check for pending notifications and pass them to the client
	*/
	public function refresh($attr)
	{
	// collect pending alarms from all providers (e.g. calendar, tasks)
	$plugin = $this->rc->plugins->exec_hook('pending_alarms', array(
	'time' => time(),
	'alarms' => array(),
	));

	if (!$plugin['abort'] && !empty($plugin['alarms'])) {
	// make sure texts and env vars are available on client
	$this->add_texts('localization/', true);
	$this->rc->output->add_label('close');
	$this->rc->output->set_env('snooze_select', $this->snooze_select());
	$this->rc->output->command('plugin.display_alarms', $this->_alarms_output($plugin['alarms']));
	}
	}

	/**
	* Handler for alarm dismiss/snooze requests
	*/
	public function alarms_action()
	{
	// $action = rcube_utils::get_input_value('action', rcube_utils::INPUT_GPC);
	$data = rcube_utils::get_input_value('data', rcube_utils::INPUT_POST, true);

	$data['ids'] = explode(',', $data['id']);
	$plugin = $this->rc->plugins->exec_hook('dismiss_alarms', $data);

	if ($plugin['success'])
	$this->rc->output->show_message('successfullysaved', 'confirmation');
	else
	$this->rc->output->show_message('calendar.errorsaving', 'error');
	}

	/**
	* Generate reduced and streamlined output for pending alarms
	*/
	private function _alarms_output($alarms)
	{
	$out = array();
	foreach ($alarms as $alarm) {
	$out[] = array(
	'id' => $alarm['id'],
	'start' => $alarm['start'] ? $this->adjust_timezone($alarm['start'])->format('c') : '',
	'end' => $alarm['end'] ? $this->adjust_timezone($alarm['end'])->format('c') : '',
	'allDay' => $alarm['allday'] == 1,
	'action' => $alarm['action'],
	'title' => $alarm['title'],
	'location' => $alarm['location'],
	'calendar' => $alarm['calendar'],
	);
	}

	return $out;
	}

	/**
	* Render a dropdown menu to choose snooze time
	*/
	private function snooze_select($attrib = array())
	{
	$steps = array(
	5 => 'repeatinmin',
	10 => 'repeatinmin',
	15 => 'repeatinmin',
	20 => 'repeatinmin',
	30 => 'repeatinmin',
	60 => 'repeatinhr',
	120 => 'repeatinhrs',
	1440 => 'repeattomorrow',
	10080 => 'repeatinweek',
	);

	$items = array();
	foreach ($steps as $n => $label) {
	$items[] = html::tag('li', null, html::a(array('href' => "#" . ($n * 60), 'class' => 'active'),
	$this->gettext(array('name' => $label, 'vars' => array('min' => $n % 60, 'hrs' => intval($n / 60))))));
	}

	return html::tag('ul', $attrib + array('class' => 'toolbarmenu'), join("\n", $items), html::$common_attrib);
	}


	/******* Recurrence rules handling ******/

	/**
	* Render localized text describing the recurrence rule of an event
	*/
	public function recurrence_text($rrule)
	{
	$limit = 10;
	$exdates = array();
	$format = $this->rc->config->get('calendar_date_format', $this->defaults['calendar_date_format']);
	$format = self::to_php_date_format($format);
	$format_fn = function($dt) use ($format) {
	return rcmail::get_instance()->format_date($dt, $format);
	};

	if (is_array($rrule['EXDATE']) && !empty($rrule['EXDATE'])) {
	$exdates = array_map($format_fn, $rrule['EXDATE']);
	}

	if (empty($rrule['FREQ']) && !empty($rrule['RDATE'])) {
	$rdates = array_map($format_fn, $rrule['RDATE']);

	if (!empty($exdates)) {
	$rdates = array_diff($rdates, $exdates);
	}

	if (count($rdates) > $limit) {
	$rdates = array_slice($rdates, 0, $limit);
	$more = true;
	}

	return $this->gettext('ondate') . ' ' . join(', ', $rdates)
	. ($more ? '...' : '');
	}

	$output = sprintf('%s %d ', $this->gettext('every'), $rrule['INTERVAL'] ?: 1);

	switch ($rrule['FREQ']) {
	case 'DAILY':
	$output .= $this->gettext('days');
	break;
	case 'WEEKLY':
	$output .= $this->gettext('weeks');
	break;
	case 'MONTHLY':
	$output .= $this->gettext('months');
	break;
	case 'YEARLY':
	$output .= $this->gettext('years');
	break;
	}

	if ($rrule['COUNT']) {
	$until = $this->gettext(array('name' => 'forntimes', 'vars' => array('nr' => $rrule['COUNT'])));
	}
	else if ($rrule['UNTIL']) {
	$until = $this->gettext('recurrencend') . ' ' . $this->rc->format_date($rrule['UNTIL'], $format);
	}
	else {
	$until = $this->gettext('forever');
	}

	$output .= ', ' . $until;

	if (!empty($exdates)) {
	if (count($exdates) > $limit) {
	$exdates = array_slice($exdates, 0, $limit);
	$more = true;
	}

	$output = '; ' . $this->gettext('except') . ' ' . join(', ', $exdates)
	. ($more ? '...' : '');
	}

	return $output;
	}

	/**
	* Generate the form for recurrence settings
	*/
	public function recurrence_form($attrib = array())
	{
	switch ($attrib['part']) {
	// frequency selector
	case 'frequency':
	$select = new html_select(array('name' => 'frequency', 'id' => 'edit-recurrence-frequency'));
	$select->add($this->gettext('never'), '');
	$select->add($this->gettext('daily'), 'DAILY');
	$select->add($this->gettext('weekly'), 'WEEKLY');
	$select->add($this->gettext('monthly'), 'MONTHLY');
	$select->add($this->gettext('yearly'), 'YEARLY');
	$select->add($this->gettext('rdate'), 'RDATE');
	$html = html::label('edit-recurrence-frequency', $this->gettext('frequency')) . $select->show('');
	break;

	// daily recurrence
	case 'daily':
	$select = $this->interval_selector(array('name' => 'interval', 'class' => 'edit-recurrence-interval', 'id' => 'edit-recurrence-interval-daily'));
	$html = html::div($attrib, html::label('edit-recurrence-interval-daily', $this->gettext('every')) . $select->show(1) . html::span('label-after', $this->gettext('days')));
	break;

	// weekly recurrence form
	case 'weekly':
	$select = $this->interval_selector(array('name' => 'interval', 'class' => 'edit-recurrence-interval', 'id' => 'edit-recurrence-interval-weekly'));
	$html = html::div($attrib, html::label('edit-recurrence-interval-weekly', $this->gettext('every')) . $select->show(1) . html::span('label-after', $this->gettext('weeks')));
	// weekday selection
	$daymap = array('sun','mon','tue','wed','thu','fri','sat');
	$checkbox = new html_checkbox(array('name' => 'byday', 'class' => 'edit-recurrence-weekly-byday'));
	$first = $this->rc->config->get('calendar_first_day', 1);
	for ($weekdays = '', $j = $first; $j <= $first+6; $j++) {
	$d = $j % 7;
	$weekdays .= html::label(array('class' => 'weekday'),
	$checkbox->show('', array('value' => strtoupper(substr($daymap[$d], 0, 2)))) .
	$this->gettext($daymap[$d])
	) . ' ';
	}
	$html .= html::div($attrib, html::label(null, $this->gettext('bydays')) . $weekdays);
	break;

	// monthly recurrence form
	case 'monthly':
	$select = $this->interval_selector(array('name' => 'interval', 'class' => 'edit-recurrence-interval', 'id' => 'edit-recurrence-interval-monthly'));
	$html = html::div($attrib, html::label('edit-recurrence-interval-monthly', $this->gettext('every')) . $select->show(1) . html::span('label-after', $this->gettext('months')));

	$checkbox = new html_checkbox(array('name' => 'bymonthday', 'class' => 'edit-recurrence-monthly-bymonthday'));
	for ($monthdays = '', $d = 1; $d <= 31; $d++) {
	$monthdays .= html::label(array('class' => 'monthday'), $checkbox->show('', array('value' => $d)) . $d);
	$monthdays .= $d % 7 ? ' ' : html::br();
	}

	// rule selectors
	$radio = new html_radiobutton(array('name' => 'repeatmode', 'class' => 'edit-recurrence-monthly-mode'));
	$table = new html_table(array('cols' => 2, 'border' => 0, 'cellpadding' => 0, 'class' => 'formtable'));
	$table->add('label', html::label(null, $radio->show('BYMONTHDAY', array('value' => 'BYMONTHDAY')) . ' ' . $this->gettext('each')));
	$table->add(null, $monthdays);
	$table->add('label', html::label(null, $radio->show('', array('value' => 'BYDAY')) . ' ' . $this->gettext('onevery')));
	$table->add(null, $this->rrule_selectors($attrib['part']));

	$html .= html::div($attrib, $table->show());
	break;

	// annually recurrence form
	case 'yearly':
	$select = $this->interval_selector(array('name' => 'interval', 'class' => 'edit-recurrence-interval', 'id' => 'edit-recurrence-interval-yearly'));
	$html = html::div($attrib, html::label('edit-recurrence-interval-yearly', $this->gettext('every')) . $select->show(1) . html::span('label-after', $this->gettext('years')));
	// month selector
	$monthmap = array('','jan','feb','mar','apr','may','jun','jul','aug','sep','oct','nov','dec');
	$checkbox = new html_checkbox(array('name' => 'bymonth', 'class' => 'edit-recurrence-yearly-bymonth'));
	for ($months = '', $m = 1; $m <= 12; $m++) {
	$months .= html::label(array('class' => 'month'), $checkbox->show(null, array('value' => $m)) . $this->gettext($monthmap[$m]));
	$months .= $m % 4 ? ' ' : html::br();
	}
	$html .= html::div($attrib + array('id' => 'edit-recurrence-yearly-bymonthblock'), $months);

	// day rule selection
	$html .= html::div($attrib, html::label(null, $this->gettext('onevery')) . $this->rrule_selectors($attrib['part'], '---'));
	break;

	// end of recurrence form
	case 'until':
	$radio = new html_radiobutton(array('name' => 'repeat', 'class' => 'edit-recurrence-until'));
	$select = $this->interval_selector(array('name' => 'times', 'id' => 'edit-recurrence-repeat-times'));
	$input = new html_inputfield(array('name' => 'untildate', 'id' => 'edit-recurrence-enddate', 'size' => "10"));

	$html = html::div('line first',
	html::label(null, $radio->show('', array('value' => '', 'id' => 'edit-recurrence-repeat-forever')) . ' ' .
	$this->gettext('forever'))
	);

	$forntimes = $this->gettext(array(
	'name' => 'forntimes',
	'vars' => array('nr' => '%s'))
	);
	$html .= html::div('line',
	$radio->show('', array('value' => 'count', 'id' => 'edit-recurrence-repeat-count', 'aria-label' => sprintf($forntimes, 'N'))) . ' ' .
	sprintf($forntimes, $select->show(1))
	);

	$html .= html::div('line',
	$radio->show('', array('value' => 'until', 'id' => 'edit-recurrence-repeat-until', 'aria-label' => $this->gettext('untilenddate'))) . ' ' .
	$this->gettext('untildate') . ' ' . $input->show('', array('aria-label' => $this->gettext('untilenddate')))
	);

	$html = html::div($attrib, html::label(null, ucfirst($this->gettext('recurrencend'))) . $html);
	break;

	case 'rdate':
	$ul = html::tag('ul', array('id' => 'edit-recurrence-rdates'), '');
	$input = new html_inputfield(array('name' => 'rdate', 'id' => 'edit-recurrence-rdate-input', 'size' => "10"));
	$button = new html_inputfield(array('type' => 'button', 'class' => 'button add', 'value' => $this->gettext('addrdate')));
	$html .= html::div($attrib, $ul . html::div('inputform', $input->show() . $button->show()));
	break;
	}

	return $html;
	}

	/**
	* Input field for interval selection
	*/
	private function interval_selector($attrib)
	{
	$select = new html_select($attrib);
	$select->add(range(1,30), range(1,30));
	return $select;
	}

	/**
	* Drop-down menus for recurrence rules like "each last sunday of"
	*/
	private function rrule_selectors($part, $noselect = null)
	{
	// rule selectors
	$select_prefix = new html_select(array('name' => 'bydayprefix', 'id' => "edit-recurrence-$part-prefix"));
	if ($noselect) $select_prefix->add($noselect, '');
	$select_prefix->add(array(
	$this->gettext('first'),
	$this->gettext('second'),
	$this->gettext('third'),
	$this->gettext('fourth'),
	$this->gettext('last')
	),
	array(1, 2, 3, 4, -1));

	$select_wday = new html_select(array('name' => 'byday', 'id' => "edit-recurrence-$part-byday"));
	if ($noselect) $select_wday->add($noselect, '');

	$daymap = array('sunday','monday','tuesday','wednesday','thursday','friday','saturday');
	$first = $this->rc->config->get('calendar_first_day', 1);
	for ($j = $first; $j <= $first+6; $j++) {
	$d = $j % 7;
	$select_wday->add($this->gettext($daymap[$d]), strtoupper(substr($daymap[$d], 0, 2)));
	}

	return $select_prefix->show() . ' ' . $select_wday->show();
	}

	/**
	* Convert the recurrence settings to be processed on the client
	*/
	public function to_client_recurrence($recurrence, $allday = false)
	{
	if ($recurrence['UNTIL'])
	$recurrence['UNTIL'] = $this->adjust_timezone($recurrence['UNTIL'], $allday)->format('c');

	// format RDATE values
	if (is_array($recurrence['RDATE'])) {
	$libcal = $this;
	$recurrence['RDATE'] = array_map(function($rdate) use ($libcal) {
	return $libcal->adjust_timezone($rdate, true)->format('c');
	}, $recurrence['RDATE']);
	}

	unset($recurrence['EXCEPTIONS']);

	return $recurrence;
	}

	/**
	* Process the alarms values submitted by the client
	*/
	public function from_client_recurrence($recurrence, $start = null)
	{
	if (is_array($recurrence) && !empty($recurrence['UNTIL'])) {
	$recurrence['UNTIL'] = new DateTime($recurrence['UNTIL'], $this->timezone);
	}

	if (is_array($recurrence) && is_array($recurrence['RDATE'])) {
	$tz = $this->timezone;
	$recurrence['RDATE'] = array_map(function($rdate) use ($tz, $start) {
	try {
	$dt = new DateTime($rdate, $tz);
	if (is_a($start, 'DateTime'))
	$dt->setTime($start->format('G'), $start->format('i'));
	return $dt;
	}
	catch (Exception $e) {
	return null;
	}
	}, $recurrence['RDATE']);
	}

	return $recurrence;
	}


	/******* Attachments handling *******/

	/**
	* Handler for attachment uploads
	*/
	public function attachment_upload($session_key, $id_prefix = '')
	{
	// Upload progress update
	if (!empty($_GET['_progress'])) {
	$this->rc->upload_progress();
	}

	$recid = $id_prefix . rcube_utils::get_input_value('_id', rcube_utils::INPUT_GPC);
	$uploadid = rcube_utils::get_input_value('_uploadid', rcube_utils::INPUT_GPC);

	if (!is_array($_SESSION[$session_key]) \|\| $_SESSION[$session_key]['id'] != $recid) {
	$_SESSION[$session_key] = array();
	$_SESSION[$session_key]['id'] = $recid;
	$_SESSION[$session_key]['attachments'] = array();
	}

	// clear all stored output properties (like scripts and env vars)
	$this->rc->output->reset();

	if (is_array($_FILES['_attachments']['tmp_name'])) {
	foreach ($_FILES['_attachments']['tmp_name'] as $i => $filepath) {
	// Process uploaded attachment if there is no error
	$err = $_FILES['_attachments']['error'][$i];

	if (!$err) {
	$attachment = array(
	'path' => $filepath,
	'size' => $_FILES['_attachments']['size'][$i],
	'name' => $_FILES['_attachments']['name'][$i],
	'mimetype' => rcube_mime::file_content_type($filepath, $_FILES['_attachments']['name'][$i], $_FILES['_attachments']['type'][$i]),
	'group' => $recid,
	);

	$attachment = $this->rc->plugins->exec_hook('attachment_upload', $attachment);
	}

	if (!$err && $attachment['status'] && !$attachment['abort']) {
	$id = $attachment['id'];

	// store new attachment in session
	unset($attachment['status'], $attachment['abort']);
	$_SESSION[$session_key]['attachments'][$id] = $attachment;

	if (($icon = $_SESSION[$session_key . '_deleteicon']) && is_file($icon)) {
	$button = html::img(array(
	'src' => $icon,
	'alt' => $this->rc->gettext('delete')
	));
	}
	else {
	$button = rcube::Q($this->rc->gettext('delete'));
	}

	$content = html::a(array(
	'href' => "#delete",
	'class' => 'delete',
	'onclick' => sprintf("return %s.remove_from_attachment_list('rcmfile%s')", rcmail_output::JS_OBJECT_NAME, $id),
	'title' => $this->rc->gettext('delete'),
	'aria-label' => $this->rc->gettext('delete') . ' ' . $attachment['name'],
	), $button);

	$content .= rcube::Q($attachment['name']);

	$this->rc->output->command('add2attachment_list', "rcmfile$id", array(
	'html' => $content,
	'name' => $attachment['name'],
	'mimetype' => $attachment['mimetype'],
	'classname' => rcube_utils::file2class($attachment['mimetype'], $attachment['name']),
	'complete' => true), $uploadid);
	}
	else { // upload failed
	if ($err == UPLOAD_ERR_INI_SIZE \|\| $err == UPLOAD_ERR_FORM_SIZE) {
	$msg = $this->rc->gettext(array('name' => 'filesizeerror', 'vars' => array(
	'size' => $this->rc->show_bytes(parse_bytes(ini_get('upload_max_filesize'))))));
	}
	else if ($attachment['error']) {
	$msg = $attachment['error'];
	}
	else {
	$msg = $this->rc->gettext('fileuploaderror');
	}

	$this->rc->output->command('display_message', $msg, 'error');
	$this->rc->output->command('remove_from_attachment_list', $uploadid);
	}
	}
	}
	else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
	// if filesize exceeds post_max_size then $_FILES array is empty,
	// show filesizeerror instead of fileuploaderror
	if ($maxsize = ini_get('post_max_size'))
	$msg = $this->rc->gettext(array('name' => 'filesizeerror', 'vars' => array(
	'size' => $this->rc->show_bytes(parse_bytes($maxsize)))));
	else
	$msg = $this->rc->gettext('fileuploaderror');

	$this->rc->output->command('display_message', $msg, 'error');
	$this->rc->output->command('remove_from_attachment_list', $uploadid);
	}

	$this->rc->output->send('iframe');
	}


	/**
	* Deliver an event/task attachment to the client
	* (similar as in Roundcube core program/steps/mail/get.inc)
	*/
	public function attachment_get($attachment)
	{
	ob_end_clean();

	if ($attachment && $attachment['body']) {
	// allow post-processing of the attachment body
	$part = new rcube_message_part;
	$part->filename = $attachment['name'];
	$part->size = $attachment['size'];
	$part->mimetype = $attachment['mimetype'];

	$plugin = $this->rc->plugins->exec_hook('message_part_get', array(
	'body' => $attachment['body'],
	'mimetype' => strtolower($attachment['mimetype']),
	'download' => !empty($_GET['_download']),
	'part' => $part,
	));

	if ($plugin['abort'])
	exit;

	$mimetype = $plugin['mimetype'];
	list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);

	$browser = $this->rc->output->browser;

	// send download headers
	if ($plugin['download']) {
	header("Content-Type: application/octet-stream");
	if ($browser->ie)
	header("Content-Type: application/force-download");
	}
	else if ($ctype_primary == 'text') {
	header("Content-Type: text/$ctype_secondary");
	}
	else {
	header("Content-Type: $mimetype");
	header("Content-Transfer-Encoding: binary");
	}

	// display page, @TODO: support text/plain (and maybe some other text formats)
	if ($mimetype == 'text/html' && empty($_GET['_download'])) {
	$OUTPUT = new rcmail_html_page();
	// @TODO: use washtml on $body
	$OUTPUT->write($plugin['body']);
	}
	else {
	// don't kill the connection if download takes more than 30 sec.
	@set_time_limit(0);

	$filename = $attachment['name'];
	$filename = preg_replace('[\r\n]', '', $filename);

	if ($browser->ie && $browser->ver < 7)
	$filename = rawurlencode(abbreviate_string($filename, 55));
	else if ($browser->ie)
	$filename = rawurlencode($filename);
	else
	$filename = addcslashes($filename, '"');

	$disposition = !empty($_GET['_download']) ? 'attachment' : 'inline';
	header("Content-Disposition: $disposition; filename=\"$filename\"");

	echo $plugin['body'];
	}

	exit;
	}

	// if we arrive here, the requested part was not found
	header('HTTP/1.1 404 Not Found');
	exit;
	}

	/**
	* Show "loading..." page in attachment iframe
	*/
	public function attachment_loading_page()
	{
	$url = str_replace('&_preload=1', '', $_SERVER['REQUEST_URI']);
	$message = $this->rc->gettext('loadingdata');

	header('Content-Type: text/html; charset=' . RCUBE_CHARSET);
	print "<html>\n<head>\n"
	. '<meta http-equiv="refresh" content="0; url='.rcube::Q($url).'">' . "\n"
	. '<meta http-equiv="content-type" content="text/html; charset='.RCUBE_CHARSET.'">' . "\n"
	. "</head>\n<body>\n$message\n</body>\n</html>";
	exit;
	}

	/**
	* Template object for attachment display frame
	*/
	public function attachment_frame($attrib = array())
	{
	$mimetype = strtolower($this->attachment['mimetype']);
	list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);

	$attrib['src'] = './?' . str_replace('_frame=', ($ctype_primary == 'text' ? '_show=' : '_preload='), $_SERVER['QUERY_STRING']);

	$this->rc->output->add_gui_object('attachmentframe', $attrib['id']);

	return html::iframe($attrib);
	}

	/**
	*
	*/
	public function attachment_header($attrib = array())
	{
	$rcmail = rcmail::get_instance();
	$dl_link = strtolower($attrib['downloadlink']) == 'true';
	$dl_url = $this->rc->url(array('_frame' => null, '_download' => 1) + $_GET);

	$table = new html_table(array('cols' => $dl_link ? 3 : 2));

	if (!empty($this->attachment['name'])) {
	$table->add('title', rcube::Q($this->rc->gettext('filename')));
	$table->add('header', rcube::Q($this->attachment['name']));
	if ($dl_link) {
	$table->add('download-link', html::a($dl_url, rcube::Q($this->rc->gettext('download'))));
	}
	}

	if (!empty($this->attachment['mimetype'])) {
	$table->add('title', rcube::Q($this->rc->gettext('type')));
	$table->add('header', rcube::Q($this->attachment['mimetype']));
	}

	if (!empty($this->attachment['size'])) {
	$table->add('title', rcube::Q($this->rc->gettext('filesize')));
	$table->add('header', rcube::Q($this->rc->show_bytes($this->attachment['size'])));
	}

	$this->rc->output->set_env('attachment_download_url', $dl_url);

	return $table->show($attrib);
	}


	/******* iTip message detection *******/

	/**
	* Check mail message structure of there are .ics files attached
	*/
	public function mail_message_load($p)
	{
	$this->ical_message = $p['object'];
	$itip_part = null;

	// check all message parts for .ics files
	foreach ((array)$this->ical_message->mime_parts as $part) {
	if (self::part_is_vcalendar($part)) {
	if ($part->ctype_parameters['method'])
	$itip_part = $part->mime_id;
	else
	$this->ical_parts[] = $part->mime_id;
	}
	}

	// priorize part with method parameter
	if ($itip_part) {
	$this->ical_parts = array($itip_part);
	}
	}

	/**
	* Getter for the parsed iCal objects attached to the current email message
	*
	* @return object libvcalendar parser instance with the parsed objects
	*/
	public function get_mail_ical_objects()
	{
	// create parser and load ical objects
	if (!$this->mail_ical_parser) {
	$this->mail_ical_parser = $this->get_ical();

	foreach ($this->ical_parts as $mime_id) {
	$part = $this->ical_message->mime_parts[$mime_id];
	$charset = $part->ctype_parameters['charset'] ?: RCUBE_CHARSET;
	$this->mail_ical_parser->import($this->ical_message->get_part_body($mime_id, true), $charset);

	// check if the parsed object is an instance of a recurring event/task
	array_walk($this->mail_ical_parser->objects, 'libcalendaring::identify_recurrence_instance');

	// stop on the part that has an iTip method specified
	if (count($this->mail_ical_parser->objects) && $this->mail_ical_parser->method) {
	$this->mail_ical_parser->message_date = $this->ical_message->headers->date;
	$this->mail_ical_parser->mime_id = $mime_id;

	// store the message's sender address for comparisons
	$from = rcube_mime::decode_address_list($this->ical_message->headers->from, 1, true, null, true);
	$this->mail_ical_parser->sender = !empty($from) ? $from[1] : '';

	if (!empty($this->mail_ical_parser->sender)) {
	foreach ($this->mail_ical_parser->objects as $i => $object) {
	$this->mail_ical_parser->objects[$i]['_sender'] = $this->mail_ical_parser->sender;
	$this->mail_ical_parser->objects[$i]['_sender_utf'] = rcube_utils::idn_to_utf8($this->mail_ical_parser->sender);
	}
	}

	break;
	}
	}
	}

	return $this->mail_ical_parser;
	}

	/**
	* Read the given mime message from IMAP and parse ical data
	*
	* @param string Mailbox name
	* @param string Message UID
	* @param string Message part ID and object index (e.g. '1.2:0')
	* @param string Object type filter (optional)
	*
	* @return array Hash array with the parsed iCal
	*/
	public function mail_get_itip_object($mbox, $uid, $mime_id, $type = null)
	{
	$charset = RCUBE_CHARSET;

	// establish imap connection
	$imap = $this->rc->get_storage();
	$imap->set_folder($mbox);

	if ($uid && $mime_id) {
	list($mime_id, $index) = explode(':', $mime_id);

	$part = $imap->get_message_part($uid, $mime_id);
	$headers = $imap->get_message_headers($uid);
	$parser = $this->get_ical();

	if ($part->ctype_parameters['charset']) {
	$charset = $part->ctype_parameters['charset'];
	}

	if ($part) {
	$objects = $parser->import($part, $charset);
	}
	}

	// successfully parsed events/tasks?
	if (!empty($objects) && ($object = $objects[$index]) && (!$type \|\| $object['_type'] == $type)) {
	if ($parser->method)
	$object['_method'] = $parser->method;

	// store the message's sender address for comparisons
	$from = rcube_mime::decode_address_list($headers->from, 1, true, null, true);
	$object['_sender'] = !empty($from) ? $from[1] : '';
	$object['_sender_utf'] = rcube_utils::idn_to_utf8($object['_sender']);

	// check if this is an instance of a recurring event/task
	self::identify_recurrence_instance($object);

	return $object;
	}

	return null;
	}

	/**
	* Checks if specified message part is a vcalendar data
	*
	* @param rcube_message_part Part object
	* @return boolean True if part is of type vcard
	*/
	public static function part_is_vcalendar($part)
	{
	return (
	in_array($part->mimetype, array('text/calendar', 'text/x-vcalendar', 'application/ics')) \|\|
	// Apple sends files as application/x-any (!?)
	($part->mimetype == 'application/x-any' && $part->filename && preg_match('/\.ics$/i', $part->filename))
	);
	}

	/**
	* Single occourrences of recurring events are identified by their RECURRENCE-ID property
	* in iCal which is represented as 'recurrence_date' in our internal data structure.
	*
	* Check if such a property exists and derive the '_instance' identifier and '_savemode'
	* attributes which are used in the storage backend to identify the nested exception item.
	*/
	public static function identify_recurrence_instance(&$object)
	{
	// for savemode=all, remove recurrence instance identifiers
	if (!empty($object['_savemode']) && $object['_savemode'] == 'all' && $object['recurrence']) {
	unset($object['_instance'], $object['recurrence_date']);
	}
	// set instance and 'savemode' according to recurrence-id
	else if (!empty($object['recurrence_date']) && is_a($object['recurrence_date'], 'DateTime')) {
	$object['_instance'] = self::recurrence_instance_identifier($object);
	$object['_savemode'] = $object['thisandfuture'] ? 'future' : 'current';
	}
	else if (!empty($object['recurrence_id']) && !empty($object['_instance'])) {
	if (strlen($object['_instance']) > 4) {
	$object['recurrence_date'] = rcube_utils::anytodatetime($object['_instance'], $object['start']->getTimezone());
	}
	else {
	$object['recurrence_date'] = clone $object['start'];
	}
	}
	}

	/**
	* Return a date() format string to render identifiers for recurrence instances
	*
	* @param array Hash array with event properties
	* @return string Format string
	*/
	public static function recurrence_id_format($event)
	{
	return $event['allday'] ? 'Ymd' : 'Ymd\THis';
	}

	/**
	* Return the identifer for the given instance of a recurring event
	*
	* @param array Hash array with event properties
	* @param bool All-day flag from the main event
	*
	* @return mixed Format string or null if identifier cannot be generated
	*/
	public static function recurrence_instance_identifier($event, $allday = null)
	{
	$instance_date = $event['recurrence_date'] ?: $event['start'];

	if ($instance_date && is_a($instance_date, 'DateTime')) {
	// According to RFC5545 (3.8.4.4) RECURRENCE-ID format should
	// be date/date-time depending on the main event type, not the exception
	if ($allday === null) {
	$allday = $event['allday'];
	}

	return $instance_date->format($allday ? 'Ymd' : 'Ymd\THis');
	}
	}


	/******* Attendee handling functions *******/

	/**
	* Handler for attendee group expansion requests
	*/
	public function expand_attendee_group()
	{
	$id = rcube_utils::get_input_value('id', rcube_utils::INPUT_POST);
	$data = rcube_utils::get_input_value('data', rcube_utils::INPUT_POST, true);
	$result = array('id' => $id, 'members' => array());
	$maxnum = 500;

	// iterate over all autocomplete address books (we don't know the source of the group)
	foreach ((array)$this->rc->config->get('autocomplete_addressbooks', 'sql') as $abook_id) {
	if (($abook = $this->rc->get_address_book($abook_id)) && $abook->groups) {
	foreach ($abook->list_groups($data['name'], 1) as $group) {
	// this is the matching group to expand
	if (in_array($data['email'], (array)$group['email'])) {
	$abook->set_pagesize($maxnum);
	$abook->set_group($group['ID']);

	// get all members
	$res = $abook->list_records($this->rc->config->get('contactlist_fields'));

	// handle errors (e.g. sizelimit, timelimit)
	if ($abook->get_error()) {
	$result['error'] = $this->rc->gettext('expandattendeegrouperror', 'libcalendaring');
	$res = false;
	}
	// check for maximum number of members (we don't wanna bloat the UI too much)
	else if ($res->count > $maxnum) {
	$result['error'] = $this->rc->gettext('expandattendeegroupsizelimit', 'libcalendaring');
	$res = false;
	}

	while ($res && ($member = $res->iterate())) {
	$emails = (array)$abook->get_col_values('email', $member, true);
	if (!empty($emails) && ($email = array_shift($emails))) {
	$result['members'][] = array(
	'email' => $email,
	'name' => rcube_addressbook::compose_list_name($member),
	);
	}
	}

	break 2;
	}
	}
	}
	}

	$this->rc->output->command('plugin.expand_attendee_callback', $result);
	}

	/**
	* Merge attendees of the old and new event version
	* with keeping current user and his delegatees status
	*
	* @param array &$new New object data
	* @param array $old Old object data
	* @param bool $status New status of the current user
	*/
	public function merge_attendees(&$new, $old, $status = null)
	{
	if (empty($status)) {
	$emails = $this->get_user_emails();
	$delegates = array();
	$attendees = array();

	// keep attendee status of the current user
	foreach ((array) $new['attendees'] as $i => $attendee) {
	if (empty($attendee['email'])) {
	continue;
	}

	$attendees[] = $email = strtolower($attendee['email']);

	if (in_array($email, $emails)) {
	foreach ($old['attendees'] as $_attendee) {
	if ($attendee['email'] == $_attendee['email']) {
	$new['attendees'][$i] = $_attendee;
	if ($_attendee['status'] == 'DELEGATED' && ($email = $_attendee['delegated-to'])) {
	$delegates[] = strtolower($email);
	}

	break;
	}
	}
	}
	}

	// make sure delegated attendee is not lost
	foreach ($delegates as $delegatee) {
	if (!in_array($delegatee, $attendees)) {
	foreach ((array) $old['attendees'] as $attendee) {
	if ($attendee['email'] && ($email = strtolower($attendee['email'])) && $email == $delegatee) {
	$new['attendees'][] = $attendee;
	break;
	}
	}
	}
	}
	}

	// We also make sure that status of any attendee
	// is not overriden by NEEDS-ACTION if it was already set
	// which could happen if you work with shared events
	foreach ((array) $new['attendees'] as $i => $attendee) {
	if ($attendee['email'] && $attendee['status'] == 'NEEDS-ACTION') {
	foreach ($old['attendees'] as $_attendee) {
	if ($attendee['email'] == $_attendee['email']) {
	$new['attendees'][$i]['status'] = $_attendee['status'];
	unset($new['attendees'][$i]['rsvp']);
	break;
	}
	}
	}
	}
	}


	/******* Static utility functions *******/

	/**
	* Convert the internal structured data into a vcalendar rrule 2.0 string
	*/
	public static function to_rrule($recurrence, $allday = false)
	{
	if (is_string($recurrence))
	return $recurrence;

	$rrule = '';
	foreach ((array)$recurrence as $k => $val) {
	$k = strtoupper($k);
	switch ($k) {
	case 'UNTIL':
	// convert to UTC according to RFC 5545
	if (is_a($val, 'DateTime')) {
	if (!$allday && !$val->_dateonly) {
	$until = clone $val;
	$until->setTimezone(new DateTimeZone('UTC'));
	$val = $until->format('Ymd\THis\Z');
	}
	else {
	$val = $val->format('Ymd');
	}
	}
	break;
	case 'RDATE':
	case 'EXDATE':
	foreach ((array)$val as $i => $ex) {
	if (is_a($ex, 'DateTime'))
	$val[$i] = $ex->format('Ymd\THis');
	}
	$val = join(',', (array)$val);
	break;
	case 'EXCEPTIONS':
	continue 2;
	}

	if (strlen($val))
	$rrule .= $k . '=' . $val . ';';
	}

	return rtrim($rrule, ';');
	}

	/**
	* Convert from fullcalendar date format to PHP date() format string
	*/
	public static function to_php_date_format($from)
	{
	// "dd.MM.yyyy HH:mm:ss" => "d.m.Y H:i:s"
	return strtr(strtr($from, array(
	'YYYY' => 'Y',
	'YY' => 'y',
	'yyyy' => 'Y',
	'yy' => 'y',
	'MMMM' => 'F',
	'MMM' => 'M',
	'MM' => 'm',
	'M' => 'n',
	'dddd' => 'l',
	'ddd' => 'D',
	'dd' => 'd',
	'd' => 'j',
	'HH' => '**',
	'hh' => '%%',
	'H' => 'G',
	'h' => 'g',
	'mm' => 'i',
	'ss' => 's',
	'TT' => 'A',
	'tt' => 'a',
	'T' => 'A',
	't' => 'a',
	'u' => 'c',
	)), array(
	'**' => 'H',
	'%%' => 'h',
	));
	}

	/**
	* Convert from PHP date() format to fullcalendar format string
	*/
	public static function from_php_date_format($from)
	{
	// "d.m.Y H:i:s" => "dd.MM.yyyy HH:mm:ss"
	return strtr($from, array(
	'y' => 'yy',
	'Y' => 'yyyy',
	'M' => 'MMM',
	'F' => 'MMMM',
	'm' => 'MM',
	'n' => 'M',
	'j' => 'd',
	'd' => 'dd',
	'D' => 'ddd',
	'l' => 'dddd',
	'H' => 'HH',
	'h' => 'hh',
	'G' => 'H',
	'g' => 'h',
	'i' => 'mm',
	's' => 'ss',
	'A' => 'TT',
	'a' => 'tt',
	'c' => 'u',
	));
	}

	}
	diff --git a/plugins/libcalendaring/localization/de_CH.inc b/plugins/libcalendaring/localization/de_CH.inc
	index 4a9b0d8e..c36efbde 100644
	--- a/plugins/libcalendaring/localization/de_CH.inc
	+++ b/plugins/libcalendaring/localization/de_CH.inc
	@@ -1,159 +1,161 @@
	<?php
	/**
	* Localizations for the Kolab calendaring utilities plugin
	*
	* Copyright (C) 2014, Kolab Systems AG
	*
	* For translation see https://www.transifex.com/projects/p/kolab/resource/libcalendaring/
	*/
	$labels['until'] = 'bis';
	$labels['at'] = 'um';
	$labels['alarmemail'] = 'E-Mail senden';
	$labels['alarmdisplay'] = 'Nachricht anzeigen';
	$labels['alarmaudio'] = 'Audio abspielen';
	$labels['alarmdisplayoption'] = 'Nachricht';
	$labels['alarmemailoption'] = 'E-Mail';
	$labels['alarmaudiooption'] = 'Audio';
	$labels['alarmat'] = 'um $datetime';
	$labels['trigger@'] = 'genau am';
	$labels['trigger-M'] = 'Minuten davor';
	$labels['trigger-H'] = 'Stunden davor';
	$labels['trigger-D'] = 'Tage davor';
	$labels['trigger+M'] = 'Minuten danach';
	$labels['trigger+H'] = 'Stunden danach';
	$labels['trigger+D'] = 'Tage danach';
	$labels['triggerend-M'] = 'Minuten vor dem Ende';
	$labels['triggerend-H'] = 'Stunden vor dem Ende';
	$labels['triggerend-D'] = 'Tage vor dem Ende';
	$labels['triggerend+M'] = 'Minuten nach dem Ende';
	$labels['triggerend+H'] = 'Stunden nach dem Ende';
	$labels['triggerend+D'] = 'Tage nach dem Ende';
	$labels['trigger0'] = 'um exakt';
	$labels['triggerattime'] = 'zur Startzeit';
	$labels['triggerattimeend'] = 'zur Endzeit';
	$labels['relatedstart'] = 'Beginn';
	$labels['relatedendevent'] = 'Ende';
	$labels['relatedendtask'] = 'Frist';
	$labels['addalarm'] = 'Erinnerung hinzufügen';
	$labels['removealarm'] = 'Erinnerung entfernen';
	$labels['alarmtitle'] = 'Anstehende Termine';
	$labels['dismissall'] = 'Alle ignorieren';
	$labels['dismiss'] = 'Ignorieren';
	$labels['snooze'] = 'Später erinnern';
	$labels['repeatinmin'] = 'Wiederholung in $min Minuten';
	$labels['repeatinhr'] = 'Wiederholung in 1 Stunde';
	$labels['repeatinhrs'] = 'Wiederholung in $hrs Stunden';
	$labels['repeattomorrow'] = 'Wiederholung morgen';
	$labels['repeatinweek'] = 'Wiederholung in einer Woche';
	$labels['showmore'] = 'Mehr anzeigen...';
	$labels['recurring'] = 'Wiederholungen';
	$labels['frequency'] = 'Wiederholung';
	$labels['never'] = 'nie';
	$labels['daily'] = 'täglich';
	$labels['weekly'] = 'wöchentlich';
	$labels['monthly'] = 'monatlich';
	$labels['yearly'] = 'jährlich';
	$labels['rdate'] = 'genau um';
	$labels['every'] = 'Alle';
	$labels['days'] = 'Tag(e)';
	$labels['weeks'] = 'Woche(n)';
	$labels['months'] = 'Monat(e)';
	$labels['years'] = 'Jahre(e) im:';
	$labels['bydays'] = 'Am';
	$labels['untildate'] = 'am';
	$labels['each'] = 'Jeden';
	$labels['onevery'] = 'An jedem';
	$labels['onsamedate'] = 'Am gleichen Tag';
	$labels['forever'] = 'unendlich';
	$labels['recurrencend'] = 'bis';
	$labels['untilenddate'] = 'bis am';
	$labels['forntimes'] = '$nr Wiederholungen';
	$labels['first'] = 'erster';
	$labels['second'] = 'zweiter';
	$labels['third'] = 'dritter';
	$labels['fourth'] = 'vierter';
	$labels['last'] = 'letzter';
	$labels['dayofmonth'] = 'Tag des Montats';
	$labels['addrdate'] = 'Datum hinzufügen';
	$labels['except'] = 'ausser';
	$labels['statusorganizer'] = 'Organisator';
	$labels['statusaccepted'] = 'Akzeptiert';
	$labels['statustentative'] = 'Mit Vorbehalt';
	$labels['statusdeclined'] = 'Abgelehnt';
	$labels['statusdelegated'] = 'Delegiert';
	$labels['statusneeds-action'] = 'Braucht Aktion';
	$labels['statusunknown'] = 'Unbekannt';
	$labels['statuscompleted'] = 'Abgeschlossen';
	$labels['statusin-process'] = 'In Bearbeitung';
	+$labels['delegatedto'] = 'Delegiert an:';
	+$labels['delegatedfrom'] = 'Delegiert von:';
	$labels['itipinvitation'] = 'Einladung zu';
	$labels['itipupdate'] = 'Aktialisiert:';
	$labels['itipcancellation'] = 'Abgesagt:';
	$labels['itipreply'] = 'Antwort zu';
	$labels['itipaccepted'] = 'Akzeptieren';
	$labels['itiptentative'] = 'Mit Vorbehalt';
	$labels['itipdeclined'] = 'Ablehnen';
	$labels['itipdelegated'] = 'Vertreter';
	$labels['itipneeds-action'] = 'Aufschieben';
	$labels['itipcomment'] = 'Ihre Antwort';
	$labels['itipeditresponse'] = 'Antwort eingeben';
	$labels['itipsendercomment'] = 'Kommentar des Absenders:';
	$labels['itipsuppressreply'] = 'Keine Antwort senden';
	$labels['itipobjectnotfound'] = 'Das Objekt auf welches sich diese Nachricht bezieht, wurde in Ihrem Konto nicht gefunden.';
	$labels['itipsubjectaccepted'] = 'Einladung zu "$title" wurde von $name angenommen';
	$labels['itipsubjecttentative'] = 'Einladung zu "$title" wurde von $name mit Vorbehalt angenommen';
	$labels['itipsubjectdeclined'] = 'Einladung zu "$title" wurde von $name abgelehnt';
	$labels['itipsubjectin-process'] = '"$title" ist nun in Bearbeitung von $name';
	$labels['itipsubjectcompleted'] = '"$title" wurde vom $name fertiggestellt';
	$labels['itipsubjectcancel'] = 'Ihre Teilnahme in "$title" wurde aufgehoben';
	$labels['itipsubjectdelegated'] = '"$title" wurde durch $name delegiert';
	$labels['itipsubjectdelegatedto'] = '"$title" wurde durch $name an Sie delegiert';
	$labels['itipnewattendee'] = 'Dies ist eine Antwort von einem neuen Teilnehmer';
	$labels['updateattendeestatus'] = 'Teilnehmerstatus aktualisieren';
	$labels['acceptinvitation'] = 'Möchten Sie die Einladung zu diesem Termin annehmen?';
	$labels['acceptattendee'] = 'Teilnehmer akzeptieren';
	$labels['declineattendee'] = 'Teilnehmer ablehnen';
	$labels['declineattendeeconfirm'] = 'Nachricht an den abgelehnten Teilnehmer verfassen (optional):';
	$labels['rsvpmodeall'] = 'Die gesamte Reihe';
	$labels['rsvpmodecurrent'] = 'Nur dieses Ereignis';
	$labels['rsvpmodefuture'] = 'Dieses und zukünftige Ereignisse';
	$labels['itipsingleoccurrence'] = 'Dieses ist eine <em>einzelne Wiederholung</emaußerhalb einer Serie von Ereignissen';
	$labels['itipfutureoccurrence'] = 'Bezieht sich auf <em>diese and alle zukünftigen Wiederholungen</emeiner Serie von Ereignissen';
	$labels['itipmessagesingleoccurrence'] = 'Diese Nachricht bezieht sich nur auf eine einzelne Wiederholung';
	$labels['itipmessagefutureoccurrence'] = 'Diese Nachricht bezieht sich auf diese und alle zukünftigen Wiederholungen';
	$labels['youhaveaccepted'] = 'Sie haben die Einladung angenommen';
	$labels['youhavetentative'] = 'Sie haben die Einladung mit Vorbehalt angenommen';
	$labels['youhavedeclined'] = 'Sie haben die Einladung abgelehnt';
	$labels['youhavedelegated'] = 'Sie haben diese Einladung abgelehnt';
	$labels['youhavein-process'] = 'Sie arbeiten an dieser Aufgabe';
	$labels['youhavecompleted'] = 'Sie haben diese Aufgabe erledigt';
	$labels['youhaveneeds-action'] = 'Ihre Antwort auf diese Einladung ist noch ausstehend';
	$labels['youhavepreviouslyaccepted'] = 'Sie haben diese Einladung zuvor angenommen';
	$labels['youhavepreviouslytentative'] = 'Sie haben diese Einladung zuvor mit Vorbehalt angenommen';
	$labels['youhavepreviouslydeclined'] = 'Sie haben diese Einladung zuvor abgelehnt';
	$labels['youhavepreviouslydelegated'] = 'Sie haben diese Einladung zuvor delegiert';
	$labels['youhavepreviouslyin-process'] = 'Sie haben diese Aufgabe zuvor als In Bearbeitung gemeldet';
	$labels['youhavepreviouslycompleted'] = 'Sie haben diese Einladung zuvor erledigt';
	$labels['youhavepreviouslyneeds-action'] = 'Ihre Antwort auf diese Einladung ist noch ausstehend';
	$labels['attendeeaccepted'] = 'Teilnehmer hat akzeptiert';
	$labels['attendeetentative'] = 'Teilnehmer hat mit Vorbehalt akzeptiert';
	$labels['attendeedeclined'] = 'Teilnehmer hat abgelehnt';
	$labels['attendeedelegated'] = 'Teilnehmer hat an $delegatedto delegiert';
	$labels['attendeein-process'] = 'Teilnehmer arbeitet an dieser Aufgabe';
	$labels['attendeecompleted'] = 'Teilnehmer hat die Aufgabe erledigt';
	$labels['notanattendee'] = 'Sie sind nicht in der Liste der Teilnehmer aufgeführt';
	$labels['outdatedinvitation'] = 'Diese Einladung wurde durch eine neuere Version ersetzt';
	$labels['importtocalendar'] = 'In Kalender übernehmen';
	$labels['removefromcalendar'] = 'Aus meinem Kalender löschen';
	$labels['updatemycopy'] = 'Meine Kopie aktualisieren';
	$labels['openpreview'] = 'Vorschau öffnen';
	$labels['deleteobjectconfirm'] = 'Möchten Sie dieses Objekt wirklich löschen?';
	$labels['declinedeleteconfirm'] = 'Soll das abgelehnte Objekt ebenfalls aus Ihrem Konto gelöscht werden?';
	$labels['delegateinvitation'] = 'Einladung delegieren';
	$labels['delegateto'] = 'Delegieren an';
	$labels['delegatersvpme'] = 'Informiere mich über Aktualisierungen dieses Termins';
	$labels['delegateinvalidaddress'] = 'Geben Sie eine gültige E-Mail-Adresse für den Delegierten ein';
	$labels['savingdata'] = 'Speichere...';
	$labels['expandattendeegroup'] = 'Mit Gruppenmitgliedern ersetzen';
	$labels['expandattendeegroupnodata'] = 'Diese Gruppe konnte nicht ersetzt werden. Keine Gruppenmitglieder gefunden.';
	$labels['expandattendeegrouperror'] = 'Diese Gruppe konnte nicht ersetzt werden. Sie hat möglicherweise zuviele Mitglieder.';
	$labels['expandattendeegroupsizelimit'] = 'Die Gruppe hat zuviele Mitglieder und konnte deshalb nicht ersetzt werden.';
	diff --git a/plugins/libcalendaring/localization/de_DE.inc b/plugins/libcalendaring/localization/de_DE.inc
	index b04164eb..9919b583 100644
	--- a/plugins/libcalendaring/localization/de_DE.inc
	+++ b/plugins/libcalendaring/localization/de_DE.inc
	@@ -1,159 +1,161 @@
	<?php
	/**
	* Localizations for the Kolab calendaring utilities plugin
	*
	* Copyright (C) 2014, Kolab Systems AG
	*
	* For translation see https://www.transifex.com/projects/p/kolab/resource/libcalendaring/
	*/
	$labels['until'] = 'bis';
	$labels['at'] = 'um';
	$labels['alarmemail'] = 'E-Mail senden';
	$labels['alarmdisplay'] = 'Nachricht anzeigen';
	$labels['alarmaudio'] = 'Audio abspielen';
	$labels['alarmdisplayoption'] = 'Nachricht';
	$labels['alarmemailoption'] = 'E-Mail';
	$labels['alarmaudiooption'] = 'Audio';
	$labels['alarmat'] = 'um $datetime';
	$labels['trigger@'] = 'genau am';
	$labels['trigger-M'] = 'Minuten davor';
	$labels['trigger-H'] = 'Stunden davor';
	$labels['trigger-D'] = 'Tage davor';
	$labels['trigger+M'] = 'Minuten danach';
	$labels['trigger+H'] = 'Stunden danach';
	$labels['trigger+D'] = 'Tage danach';
	$labels['triggerend-M'] = 'Minuten vor dem Ende';
	$labels['triggerend-H'] = 'Stunden vor dem Ende';
	$labels['triggerend-D'] = 'Tage vor dem Ende';
	$labels['triggerend+M'] = 'Minuten nach dem Ende';
	$labels['triggerend+H'] = 'Stunden nach dem Ende';
	$labels['triggerend+D'] = 'Tage nach dem Ende';
	$labels['trigger0'] = 'um exakt';
	$labels['triggerattime'] = 'zur Startzeit';
	$labels['triggerattimeend'] = 'zur Endzeit';
	$labels['relatedstart'] = 'Beginn';
	$labels['relatedendevent'] = 'Ende';
	$labels['relatedendtask'] = 'Frist';
	$labels['addalarm'] = 'Erinnerung hinzufügen';
	$labels['removealarm'] = 'Erinnerung entfernen';
	$labels['alarmtitle'] = 'Anstehende Termine';
	$labels['dismissall'] = 'Alle ignorieren';
	$labels['dismiss'] = 'Ignorieren';
	$labels['snooze'] = 'Später erinnern';
	$labels['repeatinmin'] = 'Wiederholung in $min Minuten';
	$labels['repeatinhr'] = 'Wiederholung in 1 Stunde';
	$labels['repeatinhrs'] = 'Wiederholung in $hrs Stunden';
	$labels['repeattomorrow'] = 'Wiederholung morgen';
	$labels['repeatinweek'] = 'Wiederholung in einer Woche';
	$labels['showmore'] = 'Mehr anzeigen...';
	$labels['recurring'] = 'Wiederholungen';
	$labels['frequency'] = 'Wiederholung';
	$labels['never'] = 'nie';
	$labels['daily'] = 'täglich';
	$labels['weekly'] = 'wöchentlich';
	$labels['monthly'] = 'monatlich';
	$labels['yearly'] = 'jährlich';
	$labels['rdate'] = 'genau am';
	$labels['every'] = 'Alle';
	$labels['days'] = 'Tag(e)';
	$labels['weeks'] = 'Woche(n)';
	$labels['months'] = 'Monat(e)';
	$labels['years'] = 'Jahre(e) im:';
	$labels['bydays'] = 'Am';
	$labels['untildate'] = 'am';
	$labels['each'] = 'Jeden';
	$labels['onevery'] = 'An jedem';
	$labels['onsamedate'] = 'Am gleichen Tag';
	$labels['forever'] = 'unendlich';
	$labels['recurrencend'] = 'bis';
	$labels['untilenddate'] = 'bis am';
	$labels['forntimes'] = '$nr Wiederholungen';
	$labels['first'] = 'erster';
	$labels['second'] = 'zweiter';
	$labels['third'] = 'dritter';
	$labels['fourth'] = 'vierter';
	$labels['last'] = 'letzter';
	$labels['dayofmonth'] = 'Tag des Montats';
	$labels['addrdate'] = 'Datum hinzufügen';
	$labels['except'] = 'ausser';
	$labels['statusorganizer'] = 'Organisator';
	$labels['statusaccepted'] = 'Akzeptiert';
	$labels['statustentative'] = 'Mit Vorbehalt';
	$labels['statusdeclined'] = 'Abgelehnt';
	$labels['statusdelegated'] = 'Delegiert';
	$labels['statusneeds-action'] = 'Braucht Aktion';
	$labels['statusunknown'] = 'Unbekannt';
	$labels['statuscompleted'] = 'Abgeschlossen';
	+$labels['delegatedto'] = 'Delegiert an:';
	+$labels['delegatedfrom'] = 'Delegiert von:';
	$labels['statusin-process'] = 'In Bearbeitung';
	$labels['itipinvitation'] = 'Einladung zu';
	$labels['itipupdate'] = 'Aktialisiert:';
	$labels['itipcancellation'] = 'Abgesagt:';
	$labels['itipreply'] = 'Antwort zu';
	$labels['itipaccepted'] = 'Akzeptieren';
	$labels['itiptentative'] = 'Mit Vorbehalt';
	$labels['itipdeclined'] = 'Ablehnen';
	$labels['itipdelegated'] = 'Delegieren';
	$labels['itipneeds-action'] = 'Aufschieben';
	$labels['itipcomment'] = 'Ihre Antwort';
	$labels['itipeditresponse'] = 'Antwort eingeben';
	$labels['itipsendercomment'] = 'Kommentar des Absenders:';
	$labels['itipsuppressreply'] = 'Keine Antwort senden';
	$labels['itipobjectnotfound'] = 'Das Objekt auf welches sich diese Nachricht bezieht, wurde in Ihrem Konto nicht gefunden.';
	$labels['itipsubjectaccepted'] = 'Einladung zu "$title" wurde von $name angenommen';
	$labels['itipsubjecttentative'] = 'Einladung zu "$title" wurde von $name mit Vorbehalt angenommen';
	$labels['itipsubjectdeclined'] = 'Einladung zu "$title" wurde von $name abgelehnt';
	$labels['itipsubjectin-process'] = '"$title" ist nun in Bearbeitung von $name';
	$labels['itipsubjectcompleted'] = '"$title" wurde vom $name fertiggestellt';
	$labels['itipsubjectcancel'] = 'Ihre Teilnahme in "$title" wurde aufgehoben';
	$labels['itipsubjectdelegated'] = '"$title" wurde durch $name delegiert';
	$labels['itipsubjectdelegatedto'] = '"$title" wurde durch $name an Sie delegiert';
	$labels['itipnewattendee'] = 'Dies ist eine Antwort von einem neuen Teilnehmer';
	$labels['updateattendeestatus'] = 'Teilnehmerstatus aktualisieren';
	$labels['acceptinvitation'] = 'Möchten Sie die Einladung zu diesem Termin annehmen?';
	$labels['acceptattendee'] = 'Teilnehmer akzeptieren';
	$labels['declineattendee'] = 'Teilnehmer ablehnen';
	$labels['declineattendeeconfirm'] = 'Nachricht an den abgelehnten Teilnehmer verfassen (optional):';
	$labels['rsvpmodeall'] = 'Die gesamte Reihe';
	$labels['rsvpmodecurrent'] = 'Nur dieses Ereignis';
	$labels['rsvpmodefuture'] = 'Dieses und zukünftige Ereignisse';
	$labels['itipsingleoccurrence'] = 'Dieses ist eine <em>einzelne Wiederholung</em> einer Serie von Ereignissen';
	$labels['itipfutureoccurrence'] = 'Bezieht sich auf <em>diese and alle zukünftigen Wiederholungen</em> einer Serie von Ereignissen';
	$labels['itipmessagesingleoccurrence'] = 'Diese Nachricht bezieht sich nur auf eine einzelne Wiederholung';
	$labels['itipmessagefutureoccurrence'] = 'Diese Nachricht bezieht sich auf diese und alle zukünftigen Wiederholungen';
	$labels['youhaveaccepted'] = 'Sie haben die Einladung angenommen';
	$labels['youhavetentative'] = 'Sie haben die Einladung mit Vorbehalt angenommen';
	$labels['youhavedeclined'] = 'Sie haben die Einladung abgelehnt';
	$labels['youhavedelegated'] = 'Sie haben diese Einladung abgelehnt';
	$labels['youhavein-process'] = 'Sie arbeiten an dieser Aufgabe';
	$labels['youhavecompleted'] = 'Sie haben diese Aufgabe erledigt';
	$labels['youhaveneeds-action'] = 'Ihre Antwort auf diese Einladung ist noch ausstehend';
	$labels['youhavepreviouslyaccepted'] = 'Sie haben diese Einladung zuvor angenommen';
	$labels['youhavepreviouslytentative'] = 'Sie haben diese Einladung zuvor mit Vorbehalt angenommen';
	$labels['youhavepreviouslydeclined'] = 'Sie haben diese Einladung zuvor abgelehnt';
	$labels['youhavepreviouslydelegated'] = 'Sie haben diese Einladung zuvor delegiert';
	$labels['youhavepreviouslyin-process'] = 'Sie haben diese Aufgabe zuvor als In Bearbeitung gemeldet';
	$labels['youhavepreviouslycompleted'] = 'Sie haben diese Einladung zuvor erledigt';
	$labels['youhavepreviouslyneeds-action'] = 'Ihre Antwort auf diese Einladung ist noch ausstehend';
	$labels['attendeeaccepted'] = 'Teilnehmer hat akzeptiert';
	$labels['attendeetentative'] = 'Teilnehmer hat mit Vorbehalt akzeptiert';
	$labels['attendeedeclined'] = 'Teilnehmer hat abgelehnt';
	$labels['attendeedelegated'] = 'Teilnehmer hat an $delegatedto delegiert';
	$labels['attendeein-process'] = 'Teilnehmer arbeitet an dieser Aufgabe';
	$labels['attendeecompleted'] = 'Teilnehmer hat die Aufgabe erledigt';
	$labels['notanattendee'] = 'Sie sind nicht in der Liste der Teilnehmer aufgeführt';
	$labels['outdatedinvitation'] = 'Diese Einladung wurde durch eine neuere Version ersetzt';
	$labels['importtocalendar'] = 'In Kalender übernehmen';
	$labels['removefromcalendar'] = 'Aus meinem Kalender löschen';
	$labels['updatemycopy'] = 'Meine Kopie aktualisieren';
	$labels['openpreview'] = 'Vorschau öffnen';
	$labels['deleteobjectconfirm'] = 'Möchten Sie dieses Objekt wirklich löschen?';
	$labels['declinedeleteconfirm'] = 'Soll das abgelehnte Objekt ebenfalls aus Ihrem Konto gelöscht werden?';
	$labels['delegateinvitation'] = 'Einladung delegieren';
	$labels['delegateto'] = 'Delegieren an';
	$labels['delegatersvpme'] = 'Informiere mich über Aktualisierungen dieses Termins';
	$labels['delegateinvalidaddress'] = 'Geben Sie eine gültige E-Mail-Adresse für den Delegierten ein';
	$labels['savingdata'] = 'Speichere...';
	$labels['expandattendeegroup'] = 'Mit Gruppenmitgliedern ersetzen';
	$labels['expandattendeegroupnodata'] = 'Diese Gruppe konnte nicht ersetzt werden. Keine Gruppenmitglieder gefunden.';
	$labels['expandattendeegrouperror'] = 'Diese Gruppe konnte nicht ersetzt werden. Sie hat möglicherweise zuviele Mitglieder.';
	$labels['expandattendeegroupsizelimit'] = 'Die Gruppe hat zuviele Mitglieder und konnte deshalb nicht ersetzt werden.';
	diff --git a/plugins/libcalendaring/localization/en_US.inc b/plugins/libcalendaring/localization/en_US.inc
	index bbdcc2bd..1d871207 100644
	--- a/plugins/libcalendaring/localization/en_US.inc
	+++ b/plugins/libcalendaring/localization/en_US.inc
	@@ -1,186 +1,188 @@
	<?php

	/**
	* Localizations for the Kolab calendaring utilities plugin
	*
	* Copyright (C) 2014, Kolab Systems AG
	*
	* For translation see https://www.transifex.com/projects/p/kolab/resource/libcalendaring/
	*/

	$labels = array();

	// words for spoken dates
	$labels['until'] = 'until';
	$labels['at'] = 'at';

	// alarms related labels
	$labels['alarmemail'] = 'Send Email';
	$labels['alarmdisplay'] = 'Show message';
	$labels['alarmaudio'] = 'Play sound';
	$labels['alarmdisplayoption'] = 'Message';
	$labels['alarmemailoption'] = 'Email';
	$labels['alarmaudiooption'] = 'Sound';
	$labels['alarmat'] = 'at $datetime';
	$labels['trigger@'] = 'on date';
	$labels['trigger-M'] = 'minutes before';
	$labels['trigger-H'] = 'hours before';
	$labels['trigger-D'] = 'days before';
	$labels['trigger+M'] = 'minutes after';
	$labels['trigger+H'] = 'hours after';
	$labels['trigger+D'] = 'days after';
	$labels['triggerend-M'] = 'minutes before end';
	$labels['triggerend-H'] = 'hours before end';
	$labels['triggerend-D'] = 'days before end';
	$labels['triggerend+M'] = 'minutes after end';
	$labels['triggerend+H'] = 'hours after end';
	$labels['triggerend+D'] = 'days after end';
	$labels['trigger0'] = 'on time';
	$labels['triggerattime'] = 'at start time';
	$labels['triggerattimeend'] = 'at end time';
	$labels['relatedstart'] = 'start';
	$labels['relatedendevent'] = 'end';
	$labels['relatedendtask'] = 'due time';
	$labels['addalarm'] = 'Add alarm';
	$labels['removealarm'] = 'Remove alarm';

	$labels['alarmtitle'] = 'Upcoming events';
	$labels['dismissall'] = 'Dismiss all';
	$labels['dismiss'] = 'Dismiss';
	$labels['snooze'] = 'Snooze';
	$labels['repeatinmin'] = 'Repeat in $min minutes';
	$labels['repeatinhr'] = 'Repeat in 1 hour';
	$labels['repeatinhrs'] = 'Repeat in $hrs hours';
	$labels['repeattomorrow'] = 'Repeat tomorrow';
	$labels['repeatinweek'] = 'Repeat in a week';

	$labels['showmore'] = 'Show more...';

	// recurrence related labels
	$labels['recurring'] = 'Repeats';
	$labels['frequency'] = 'Repeat';
	$labels['never'] = 'never';
	$labels['daily'] = 'daily';
	$labels['weekly'] = 'weekly';
	$labels['monthly'] = 'monthly';
	$labels['yearly'] = 'annually';
	$labels['rdate'] = 'on dates';
	$labels['every'] = 'Every';
	$labels['days'] = 'day(s)';
	$labels['weeks'] = 'week(s)';
	$labels['months'] = 'month(s)';
	$labels['years'] = 'year(s)';
	$labels['bydays'] = 'On';
	$labels['untildate'] = 'the';
	$labels['each'] = 'Each';
	$labels['onevery'] = 'On every';
	$labels['onsamedate'] = 'On the same date';
	$labels['forever'] = 'forever';
	$labels['recurrencend'] = 'until';
	$labels['untilenddate'] = 'until date';
	$labels['forntimes'] = 'for $nr time(s)';
	$labels['first'] = 'first';
	$labels['second'] = 'second';
	$labels['third'] = 'third';
	$labels['fourth'] = 'fourth';
	$labels['last'] = 'last';
	$labels['dayofmonth'] = 'Day of month';
	$labels['addrdate'] = 'Add repeat date';
	$labels['except'] = 'except';

	$labels['statusorganizer'] = 'Organizer';
	$labels['statusaccepted'] = 'Accepted';
	$labels['statustentative'] = 'Tentative';
	$labels['statusdeclined'] = 'Declined';
	$labels['statusdelegated'] = 'Delegated';
	$labels['statusneeds-action'] = 'Needs action';
	$labels['statusunknown'] = 'Unknown';
	$labels['statuscompleted'] = 'Completed';
	$labels['statusin-process'] = 'In process';
	+$labels['delegatedto'] = 'Delegated to: ';
	+$labels['delegatedfrom'] = 'Delegated from: ';

	// itip related labels
	$labels['itipinvitation'] = 'Invitation to';
	$labels['itipupdate'] = 'Update of';
	$labels['itipcancellation'] = 'Cancelled:';
	$labels['itipreply'] = 'Reply to';
	$labels['itipaccepted'] = 'Accept';
	$labels['itiptentative'] = 'Maybe';
	$labels['itipdeclined'] = 'Decline';
	$labels['itipdelegated'] = 'Delegate';
	$labels['itipneeds-action'] = 'Postpone';
	$labels['itipcomment'] = 'Your response';
	$labels['itipeditresponse'] = 'Enter a response text';
	$labels['itipsendercomment'] = 'Sender\'s comment: ';
	$labels['itipsuppressreply'] = 'Do not send a response';

	$labels['itipobjectnotfound'] = 'The object referred by this message was not found in your account.';
	$labels['itipsubjectaccepted'] = '"$title" has been accepted by $name';
	$labels['itipsubjecttentative'] = '"$title" has been tentatively accepted by $name';
	$labels['itipsubjectdeclined'] = '"$title" has been declined by $name';
	$labels['itipsubjectin-process'] = '"$title" is in-process by $name';
	$labels['itipsubjectcompleted'] = '"$title" was completed by $name';
	$labels['itipsubjectcancel'] = 'Your participation in "$title" has been cancelled';
	$labels['itipsubjectdelegated'] = '"$title" has been delegated by $name';
	$labels['itipsubjectdelegatedto'] = '"$title" has been delegated to you by $name';

	$labels['itipnewattendee'] = 'This is a reply from a new participant';
	$labels['updateattendeestatus'] = 'Update the participant\'s status';
	$labels['acceptinvitation'] = 'Do you accept this invitation?';
	$labels['acceptattendee'] = 'Accept participant';
	$labels['declineattendee'] = 'Decline participant';
	$labels['declineattendeeconfirm'] = 'Enter a message to the declined participant (optional):';
	$labels['rsvpmodeall'] = 'The entire series';
	$labels['rsvpmodecurrent'] = 'This occurrence only';
	$labels['rsvpmodefuture'] = 'This and future occurrences';

	$labels['itipsingleoccurrence'] = 'This is a <em>single occurrence</em> out of a series of events';
	$labels['itipfutureoccurrence'] = 'Refers to <em>this and all future occurrences</em> of a series of events';
	$labels['itipmessagesingleoccurrence'] = 'The message only refers to this single occurrence';
	$labels['itipmessagefutureoccurrence'] = 'The message refers to this and all future occurrences';

	$labels['youhaveaccepted'] = 'You have accepted this invitation';
	$labels['youhavetentative'] = 'You have tentatively accepted this invitation';
	$labels['youhavedeclined'] = 'You have declined this invitation';
	$labels['youhavedelegated'] = 'You have delegated this invitation';
	$labels['youhavein-process'] = 'You are working on this assignment';
	$labels['youhavecompleted'] = 'You have completed this assignment';
	$labels['youhaveneeds-action'] = 'Your response to this invitation is still pending';

	$labels['youhavepreviouslyaccepted'] = 'You have previously accepted this invitation';
	$labels['youhavepreviouslytentative'] = 'You have previously accepted this invitation tentatively';
	$labels['youhavepreviouslydeclined'] = 'You have previously declined this invitation';
	$labels['youhavepreviouslydelegated'] = 'You have previously delegated this invitation';
	$labels['youhavepreviouslyin-process'] = 'You have previously reported to work on this assignment';
	$labels['youhavepreviouslycompleted'] = 'You have previously completed this assignment';
	$labels['youhavepreviouslyneeds-action'] = 'Your response to this invitation is still pending';

	$labels['attendeeaccepted'] = 'Participant has accepted';
	$labels['attendeetentative'] = 'Participant has tentatively accepted';
	$labels['attendeedeclined'] = 'Participant has declined';
	$labels['attendeedelegated'] = 'Participant has delegated to $delegatedto';
	$labels['attendeein-process'] = 'Participant is in-process';
	$labels['attendeecompleted'] = 'Participant has completed';
	$labels['notanattendee'] = 'You\'re not listed as an attendee of this object';
	$labels['outdatedinvitation'] = 'This invitation has been replaced by a newer version';

	$labels['importtocalendar'] = 'Save to my calendar';
	$labels['removefromcalendar'] = 'Remove from my calendar';
	$labels['updatemycopy'] = 'Update my copy';
	$labels['openpreview'] = 'Open Preview';

	$labels['deleteobjectconfirm'] = 'Do you really want to delete this object?';
	$labels['declinedeleteconfirm'] = 'Do you also want to delete this declined object from your account?';

	$labels['delegateinvitation'] = 'Delegate Invitation';
	$labels['delegateto'] = 'Delegate to';
	$labels['delegatersvpme'] = 'Keep me informed about updates of this incidence';
	$labels['delegateinvalidaddress'] = 'Please enter a valid email address for the delegate';

	$labels['savingdata'] = 'Saving data...';

	// attendees labels
	$labels['expandattendeegroup'] = 'Substitute with group members';
	$labels['expandattendeegroupnodata'] = 'Unable to substitute this group. No members found.';
	$labels['expandattendeegrouperror'] = 'Unable to substitute this group. It might contain too many members.';
	$labels['expandattendeegroupsizelimit'] = 'This group contains too many members for substituting.';

	diff --git a/plugins/tasklist/localization/en_US.inc b/plugins/tasklist/localization/en_US.inc
	index e42194c4..d34f17de 100644
	--- a/plugins/tasklist/localization/en_US.inc
	+++ b/plugins/tasklist/localization/en_US.inc
	@@ -1,217 +1,215 @@
	<?php

	/**
	* Localizations for the Kolab Tasks plugin
	*
	* Copyright (C) 2014, Kolab Systems AG
	*
	* For translation see https://www.transifex.com/projects/p/kolab/resource/tasklist/
	*/

	$labels = array();
	$labels['navtitle'] = 'Tasks';
	$labels['lists'] = 'Tasklists';
	$labels['list'] = 'Tasklist';
	$labels['tags'] = 'Tags';
	$labels['export'] = 'Export';
	$labels['exporttitle'] = 'Export to iCalendar';
	$labels['exportattachments'] = 'With attachments';
	$labels['currentview'] = 'current view';
	$labels['tasklistsubscribe'] = 'List permanently';
	$labels['listsearchresults'] = 'Available Tasklists';
	$labels['findlists'] = 'Find tasklists...';
	$labels['searchterms'] = 'Search terms';
	$labels['notasklistsfound'] = 'No tasklists found';
	$labels['nrtasklistsfound'] = '$nr tasklists found';
	$labels['removelist'] = 'Remove from list';
	$labels['showcaldavurl'] = 'Show CalDAV URL';
	$labels['caldavurldescription'] = 'Copy this address to a <a href="http://en.wikipedia.org/wiki/CalDAV" target="_blank">CalDAV</a> client application (e.g. Evolution or Mozilla Thunderbird) to synchronize this specific tasklist with your computer or mobile device.';

	$labels['newtask'] = 'New Task';
	$labels['createtask'] = 'Create Task <Enter>';
	$labels['createnewtask'] = 'Create new Task (e.g. Saturday, Mow the lawn)';
	$labels['createfrommail'] = 'Save as task';
	$labels['printtitle'] = 'Print tasks';
	$labels['printdescriptions'] = 'Print descriptions';
	$labels['mark'] = 'Mark';
	$labels['unmark'] = 'Unmark';
	$labels['edit'] = 'Edit';
	$labels['delete'] = 'Delete';
	$labels['title'] = 'Title';
	$labels['description'] = 'Description';
	$labels['datetime'] = 'Due';
	$labels['duetime'] = 'Due time';
	$labels['start'] = 'Start';
	$labels['starttime'] = 'Start time';
	$labels['alarms'] = 'Reminder';
	$labels['repeat'] = 'Repeat';
	$labels['links'] = 'Reference';
	$labels['status'] = 'Status';
	$labels['status-needs-action'] = 'Needs action';
	$labels['status-in-process'] = 'In process';
	$labels['status-completed'] = 'Completed';
	$labels['status-cancelled'] = 'Cancelled';
	$labels['assignedto'] = 'Assigned to';
	$labels['created'] = 'Created';
	$labels['changed'] = 'Last Modified';
	$labels['taskoptions'] = 'Options';

	$labels['all'] = 'All';
	$labels['flagged'] = 'Flagged';
	$labels['complete'] = 'Complete';
	$labels['completeness'] = 'Progress';
	$labels['overdue'] = 'Overdue';
	$labels['today'] = 'Today';
	$labels['tomorrow'] = 'Tomorrow';
	$labels['next7days'] = 'Next 7 days';
	$labels['later'] = 'Later';
	$labels['assigned'] = 'Assigned';
	$labels['assignedtitle'] = 'Tasks you assigned to others';
	$labels['mytasks'] = 'My tasks';
	$labels['mytaskstitle'] = 'Tasks assigned to you';
	$labels['nodate'] = 'no date';
	$labels['removetag'] = 'Remove';
	$labels['removelink'] = 'Remove email reference';
	$labels['auto'] = 'Auto';

	$labels['taskdetails'] = 'Details';
	$labels['newtask'] = 'New Task';
	$labels['edittask'] = 'Edit Task';
	$labels['save'] = 'Save';
	$labels['cancel'] = 'Cancel';
	$labels['saveandnotify'] = 'Save and Notify';
	$labels['addsubtask'] = 'Add subtask';
	$labels['deletetask'] = 'Delete task';
	$labels['deletethisonly'] = 'Delete this task only';
	$labels['deletewithchilds'] = 'Delete with all subtasks';
	$labels['taskactions'] = 'Task options...';

	$labels['tabsummary'] = 'Summary';
	$labels['tabrecurrence'] = 'Recurrence';
	$labels['tabassignments'] = 'Assignments';
	$labels['tabattachments'] = 'Attachments';
	$labels['tabsharing'] = 'Sharing';

	$labels['editlist'] = 'Edit list';
	$labels['createlist'] = 'Add list';
	$labels['listactions'] = 'List options...';
	$labels['listname'] = 'Name';
	$labels['showalarms'] = 'Show reminders';
	$labels['import'] = 'Import';
	$labels['viewactions'] = 'View actions';
	$labels['focusview'] = 'View only this list';

	// date words
	$labels['on'] = 'on';
	$labels['at'] = 'at';
	$labels['this'] = 'this';
	$labels['next'] = 'next';
	$labels['yes'] = 'yes';

	// messages
	$labels['savingdata'] = 'Saving data...';
	$labels['errorsaving'] = 'Failed to save data.';
	$labels['notasksfound'] = 'No tasks found for the given criteria';
	$labels['invalidstartduedates'] = 'Start date must not be greater than due date.';
	$labels['invalidstartduetimes'] = 'Start and due dates must either both or none specify a time.';
	$labels['recurrencerequiresdate'] = 'Recurring tasks require either a start or due date.';
	$labels['deletetasktconfirm'] = 'Do you really want to delete this task?';
	$labels['deleteparenttasktconfirm'] = 'Do you really want to delete this task and all its subtasks?';
	$labels['deletelistconfirm'] = 'Do you really want to delete this list with all its tasks?';
	$labels['deletelistconfirmrecursive'] = 'Do you really want to delete this list with all its sub-lists and tasks?';
	$labels['aclnorights'] = 'You do not have administrator rights on this task list.';
	$labels['changetaskconfirm'] = 'Update task';
	$labels['changeconfirmnotifications'] = 'Do you want to notify the attendees about the modification?';
	$labels['partstatupdatenotification'] = 'Do you want to notify the organizer about the status change?';

	// (hidden) titles and labels for accessibility annotations
	$labels['quickaddinput'] = 'New task date and title';
	$labels['arialabelquickaddbox'] = 'Quick add new task';
	$labels['arialabelsearchform'] = 'Task search form';
	$labels['arialabelquicksearchbox'] = 'Task search input';
	$labels['arialabellistsearchform'] = 'Tasklists search form';
	$labels['arialabeltaskselector'] = 'List mode';
	$labels['arialabeltasklisting'] = 'Tasks listing';

	// attendees
	$labels['attendee'] = 'Assignee';
	$labels['role'] = 'Role';
	$labels['availability'] = 'Avail.';
	$labels['confirmstate'] = 'Status';
	$labels['addattendee'] = 'Add assignee';
	$labels['roleorganizer'] = 'Organizer';
	$labels['rolerequired'] = 'Required';
	$labels['roleoptional'] = 'Optional';
	$labels['rolechair'] = 'Chair';
	$labels['rolenonparticipant'] = 'Observer';
	$labels['sendinvitations'] = 'Send invitations';
	$labels['sendnotifications'] = 'Notify assignees about modifications';
	$labels['sendcancellation'] = 'Notify assignees about task cancellation';
	$labels['invitationsubject'] = 'You\'ve been assigned to "$title"';
	$labels['invitationmailbody'] = "\$title\n\nDue: \$date\n\nAssignees: \$attendees\n\nPlease find attached an iCalendar file with all the task details which you can import to your tasks application.";
	$labels['itipupdatesubject'] = '"$title" has been updated';
	$labels['itipupdatesubjectempty'] = 'A task that concerns you has been updated';
	$labels['itipupdatemailbody'] = "\$title\n\nDue: \$date\n\nAssignees: \$attendees\n\nPlease find attached an iCalendar file with the updated task details which you can import to your tasks application.";
	$labels['itipcancelsubject'] = '"$title" has been cancelled';
	$labels['itipcancelmailbody'] = "\$title\n\nDue: \$date\n\nAssignees: \$attendees\n\nThe task has been cancelled by \$organizer.\n\nPlease find attached an iCalendar file with the updated task details.";
	$labels['saveintasklist'] = 'save in ';

	// history dialog
	$labels['taskhistory'] = 'History';
	$labels['objectchangelog'] = 'Change History';
	$labels['objectdiff'] = 'Changes from $rev1 to $rev2';
	$labels['objectnotfound'] = 'Failed to load task data';
	$labels['objectchangelognotavailable'] = 'Change history is not available for this task';
	$labels['objectdiffnotavailable'] = 'No comparison possible for the selected revisions';
	$labels['revisionrestoreconfirm'] = 'Do you really want to restore revision $rev of this task? This will replace the current task with the old version.';
	$labels['objectrestoresuccess'] = 'Revision $rev successfully restored';
	$labels['objectrestoreerror'] = 'Failed to restore the old revision';

	// invitation handling (overrides labels from libcalendaring)
	$labels['itipobjectnotfound'] = 'The task referred by this message was not found in your tasks list.';

	$labels['itipmailbodyaccepted'] = "\$sender has accepted the assignment to the following task:\n\n\$title\n\nDue: \$date\n\nAssignees: \$attendees";
	$labels['itipmailbodytentative'] = "\$sender has tentatively accepted the assignment to the following task:\n\n\$title\n\nDue: \$date\n\nAssignees: \$attendees";
	$labels['itipmailbodydeclined'] = "\$sender has declined the assignment to the following task:\n\n\$title\n\nDue: \$date\n\nAssignees: \$attendees";
	$labels['itipmailbodycancel'] = "\$sender has rejected your assignment to the following task:\n\n\$title\n\nDue: \$date";
	$labels['itipmailbodyin-process'] = "\$sender has set the status of the following task to in-process:\n\n\$title\n\nDue: \$date";
	$labels['itipmailbodycompleted'] = "\$sender has completed the following task:\n\n\$title\n\nDue: \$date";
	$labels['itipmailbodydelegated'] = "\$sender has delegated the following task:\n\n\$title\n\nDue: \$date";
	$labels['itipmailbodydelegatedto'] = "\$sender has delegated the following task to you:\n\n\$title\n\nDue: \$date";

	$labels['attendeeaccepted'] = 'Assignee has accepted';
	$labels['attendeetentative'] = 'Assignee has tentatively accepted';
	$labels['attendeedeclined'] = 'Assignee has declined';
	$labels['attendeedelegated'] = 'Assignee has delegated to $delegatedto';
	$labels['attendeein-process'] = 'Assignee is in-process';
	$labels['attendeecompleted'] = 'Assignee has completed';

	$labels['acceptinvitation'] = 'Do you accept this assignment?';
	$labels['itipdeclinetask'] = 'Decline your assignment to this task to the organizer';
	$labels['declinedeleteconfirm'] = 'Do you also want to delete this declined task from your tasks list?';
	$labels['itipcomment'] = 'Invitation/notification comment';
	$labels['itipcommenttitle'] = 'This comment will be attached to the invitation/notification message sent to assignees';
	$labels['itipsendsuccess'] = 'Notification sent to assignees';
	$labels['errornotifying'] = 'Failed to send notifications to task assignees';
	$labels['removefromcalendar'] = 'Remove from my tasks';
	$labels['delegateinvitation'] = 'Delegate assignment';

	$labels['andnmore'] = '$nr more...';
	-$labels['delegatedto'] = 'Delegated to: ';
	-$labels['delegatedfrom'] = 'Delegated from: ';
	$labels['savetotasklist'] = 'Save to tasks';
	$labels['comment'] = 'Comment';
	$labels['errorimportingtask'] = 'Failed to import task(s)';
	$labels['importwarningexists'] = 'A copy of this task already exists in your tasklist.';
	$labels['importsuccess'] = 'Successfully imported $nr tasks';
	$labels['newerversionexists'] = 'A newer version of this task already exists! Aborted.';
	$labels['nowritetasklistfound'] = 'No tasklist found to save the task';
	$labels['importedsuccessfully'] = 'The task was successfully added to \'$list\'';
	$labels['updatedsuccessfully'] = 'The task was successfully updated in \'$list\'';
	$labels['attendeupdateesuccess'] = 'Successfully updated the participant\'s status';
	$labels['itipresponseerror'] = 'Failed to send the response to this task assignment';
	$labels['itipinvalidrequest'] = 'This invitation is no longer valid';
	$labels['sentresponseto'] = 'Successfully sent assignment response to $mailto';
	$labels['successremoval'] = 'The task has been deleted successfully.';
	$labels['invalidlistproperties'] = 'Invalid list properties! Please set a valid name.';
	$labels['arialabelsortmenu'] = 'Tasks sorting options';
	diff --git a/plugins/tasklist/tasklist.js b/plugins/tasklist/tasklist.js
	index ca2ceb51..a44ae3d9 100644
	--- a/plugins/tasklist/tasklist.js
	+++ b/plugins/tasklist/tasklist.js
	@@ -1,3460 +1,3460 @@
	/**
	* Client scripts for the Tasklist plugin
	*
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* @licstart The following is the entire license notice for the
	* JavaScript code in this file.
	*
	* Copyright (C) 2012-2015, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	* @licend The above is the entire license notice
	* for the JavaScript code in this file.
	*/

	function rcube_tasklist_ui(settings)
	{
	// extend base class
	rcube_libcalendaring.call(this, settings);

	/* constants */
	var FILTER_MASK_ALL = 0;
	var FILTER_MASK_TODAY = 1;
	var FILTER_MASK_TOMORROW = 2;
	var FILTER_MASK_WEEK = 4;
	var FILTER_MASK_LATER = 8;
	var FILTER_MASK_NODATE = 16;
	var FILTER_MASK_OVERDUE = 32;
	var FILTER_MASK_FLAGGED = 64;
	var FILTER_MASK_COMPLETE = 128;
	var FILTER_MASK_ASSIGNED = 256;
	var FILTER_MASK_MYTASKS = 512;

	var filter_masks = {
	all: FILTER_MASK_ALL,
	today: FILTER_MASK_TODAY,
	tomorrow: FILTER_MASK_TOMORROW,
	week: FILTER_MASK_WEEK,
	later: FILTER_MASK_LATER,
	nodate: FILTER_MASK_NODATE,
	overdue: FILTER_MASK_OVERDUE,
	flagged: FILTER_MASK_FLAGGED,
	complete: FILTER_MASK_COMPLETE,
	assigned: FILTER_MASK_ASSIGNED,
	mytasks: FILTER_MASK_MYTASKS
	};

	/* private vars */
	var tagsfilter = [];
	var filtermask = FILTER_MASK_ALL;
	var loadstate = { filter:-1, lists:'', search:null };
	var idcount = 0;
	var focusview = false;
	var focusview_lists = [];
	var saving_lock;
	var ui_loading;
	var taskcounts = {};
	var listindex = [];
	var listdata = {};
	var tags = [];
	var draghelper;
	var search_request;
	var search_query;
	var completeness_slider;
	var task_draghelper;
	var tag_draghelper;
	var task_drag_active = false;
	var list_scroll_top = 0;
	var scroll_delay = 400;
	var scroll_step = 5;
	var scroll_speed = 20;
	var scroll_sensitivity = 40;
	var scroll_timer;
	var tasklists_widget;
	var focused_task;
	var focused_subclass;
	var task_attendees = [];
	var attendees_list;
	var me = this;

	// general datepicker settings
	var datepicker_settings = {
	// translate from PHP format to datepicker format
	dateFormat: settings['date_format'].replace(/M/g, 'm').replace(/mmmmm/, 'MM').replace(/mmm/, 'M').replace(/dddd/, 'DD').replace(/ddd/, 'D').replace(/yy/g, 'y'),
	firstDay : settings['first_day'],
	// dayNamesMin: settings['days_short'],
	// monthNames: settings['months'],
	// monthNamesShort: settings['months'],
	changeMonth: false,
	showOtherMonths: true,
	selectOtherMonths: true
	};
	var extended_datepicker_settings;

	/* public members */
	this.tasklists = rcmail.env.tasklists;
	this.selected_task = null;
	this.selected_list = null;

	/* public methods */
	this.init = init;
	this.edit_task = task_edit_dialog;
	this.print_tasks = print_tasks;
	this.delete_task = delete_task;
	this.add_childtask = add_childtask;
	this.quicksearch = quicksearch;
	this.reset_search = reset_search;
	this.expand_collapse = expand_collapse;
	this.list_delete = list_delete;
	this.list_remove = list_remove;
	this.list_showurl = list_showurl;
	this.list_edit_dialog = list_edit_dialog;
	this.unlock_saving = unlock_saving;

	/* imports */
	var Q = this.quote_html;
	var text2html = this.text2html;
	var event_date_text = this.event_date_text;
	var parse_datetime = this.parse_datetime;
	var date2unixtime = this.date2unixtime;
	var fromunixtime = this.fromunixtime;
	var render_message_links = this.render_message_links;

	/**
	* initialize the tasks UI
	*/
	function init()
	{
	if (rcmail.env.action == 'print' && rcmail.task == 'tasks') {
	filtermask = rcmail.env.filtermask;
	data_ready({data: rcmail.env.tasks});
	return;
	}

	// initialize task list selectors
	for (var id in me.tasklists) {
	if (settings.selected_list && me.tasklists[settings.selected_list] && !me.tasklists[settings.selected_list].active) {
	me.tasklists[settings.selected_list].active = true;
	me.selected_list = settings.selected_list;
	$(rcmail.gui_objects.tasklistslist).find("input[value='"+settings.selected_list+"']").prop('checked', true);
	}
	if (me.tasklists[id].editable && (!me.selected_list \|\| me.tasklists[id]['default'] \|\| (me.tasklists[id].active && !me.tasklists[me.selected_list].active))) {
	me.selected_list = id;
	}
	}

	if (rcmail.env.source && me.tasklists[rcmail.env.source])
	me.selected_list = rcmail.env.source;

	// initialize treelist widget that controls the tasklists list
	var widget_class = window.kolab_folderlist \|\| rcube_treelist_widget;
	tasklists_widget = new widget_class(rcmail.gui_objects.tasklistslist, {
	id_prefix: 'rcmlitasklist',
	selectable: true,
	save_state: true,
	keyboard: false,
	searchbox: '#tasklistsearch',
	search_action: 'tasks/tasklist',
	search_sources: [ 'folders', 'users' ],
	search_title: rcmail.gettext('listsearchresults','tasklist')
	});
	tasklists_widget.addEventListener('select', function(node) {
	var id = $(this).data('id');
	rcmail.enable_command('list-edit', has_permission(me.tasklists[node.id], 'wa'));
	rcmail.enable_command('list-delete', has_permission(me.tasklists[node.id], 'xa'));
	rcmail.enable_command('list-import', has_permission(me.tasklists[node.id], 'i'));
	rcmail.enable_command('list-remove', me.tasklists[node.id] && me.tasklists[node.id].removable);
	rcmail.enable_command('list-showurl', me.tasklists[node.id] && !!me.tasklists[node.id].caldavurl);
	me.selected_list = node.id;
	rcmail.update_state({source: node.id});
	});
	tasklists_widget.addEventListener('subscribe', function(p) {
	var list;
	if ((list = me.tasklists[p.id])) {
	list.subscribed = p.subscribed \|\| false;
	rcmail.http_post('tasklist', { action:'subscribe', l:{ id:p.id, active:list.active?1:0, permanent:list.subscribed?1:0 } });
	}
	});
	tasklists_widget.addEventListener('remove', function(p) {
	if (me.tasklists[p.id] && me.tasklists[p.id].removable) {
	list_remove(p.id);
	}
	});
	tasklists_widget.addEventListener('insert-item', function(p) {
	var list = p.data;
	if (list && list.id && !list.virtual) {
	me.tasklists[list.id] = list;
	var prop = { id:p.id, active:list.active?1:0 };
	if (list.subscribed) prop.permanent = 1;
	rcmail.http_post('tasklist', { action:'subscribe', l:prop });
	list_tasks();
	$(p.item).data('type', 'tasklist');
	}
	});
	tasklists_widget.addEventListener('search-complete', function(data) {
	if (data.length)
	rcmail.display_message(rcmail.gettext('nrtasklistsfound','tasklist').replace('$nr', data.length), 'voice');
	else
	rcmail.display_message(rcmail.gettext('notasklistsfound','tasklist'), 'info');
	});

	// init (delegate) event handler on tasklist checkboxes
	tasklists_widget.container.on('click', 'input[type=checkbox]', function(e) {
	var list, id = this.value;
	if ((list = me.tasklists[id])) {
	list.active = this.checked;
	fetch_counts();
	if (!this.checked) remove_tasks(id);
	else list_tasks(null);
	rcmail.http_post('tasklist', { action:'subscribe', l:{ id:id, active:list.active?1:0 } });

	// disable focusview
	if (!this.checked && focusview && $.inArray(id, focusview_lists) >= 0) {
	set_focusview(null);
	}

	// adjust checked state of original list item
	if (tasklists_widget.is_search()) {
	tasklists_widget.container.find('input[value="'+id+'"]').prop('checked', this.checked);
	}
	}
	e.stopPropagation();
	})
	.on('keypress', 'input[type=checkbox]', function(e) {
	// select tasklist on <Enter>
	if (e.keyCode == 13) {
	tasklists_widget.select(this.value);
	return rcube_event.cancel(e);
	}
	})
	.find('li:not(.virtual)').data('type', 'tasklist');

	// handler for clicks on quickview buttons
	tasklists_widget.container.on('click', '.quickview', function(e){
	var id = $(this).closest('li').attr('id').replace(/^rcmlitasklist/, '');

	if (tasklists_widget.is_search())
	id = id.replace(/--xsR$/, '');

	if (!rcube_event.is_keyboard(e) && this.blur)
	this.blur();

	set_focusview(id, e.shiftKey \|\| e.metaKey \|\| e.ctrlKey);
	e.stopPropagation();
	return false;
	});

	// register dbl-click handler to open calendar edit dialog
	tasklists_widget.container.on('dblclick', ':not(.virtual) > .tasklist', function(e){
	var id = $(this).closest('li').attr('id').replace(/^rcmlitasklist/, '');

	if (tasklists_widget.is_search())
	id = id.replace(/--xsR$/, '');

	list_edit_dialog(id);
	});

	if (me.selected_list) {
	rcmail.enable_command('addtask', true);
	tasklists_widget.select(me.selected_list);
	}

	// register server callbacks
	rcmail.addEventListener('plugin.data_ready', data_ready);
	rcmail.addEventListener('plugin.update_task', update_taskitem);
	rcmail.addEventListener('plugin.refresh_tasks', function(p) { update_taskitem(p, true); });
	rcmail.addEventListener('plugin.update_counts', update_counts);
	rcmail.addEventListener('plugin.insert_tasklist', insert_list);
	rcmail.addEventListener('plugin.update_tasklist', update_list);
	rcmail.addEventListener('plugin.destroy_tasklist', destroy_list);
	rcmail.addEventListener('plugin.unlock_saving', unlock_saving);
	rcmail.addEventListener('plugin.refresh_tagcloud', function() { update_tagcloud(); });
	rcmail.addEventListener('requestrefresh', before_refresh);
	rcmail.addEventListener('plugin.reload_data', function(){
	list_tasks(null, true);
	setTimeout(fetch_counts, 200);
	});

	rcmail.addEventListener('plugin.task_render_changelog', task_render_changelog);
	rcmail.addEventListener('plugin.task_show_diff', task_show_diff);
	rcmail.addEventListener('plugin.task_show_revision', function(data){ task_show_dialog(null, data, true); });
	rcmail.addEventListener('plugin.close_history_dialog', close_history_dialog);

	rcmail.register_command('list-sort', list_set_sort, true);
	rcmail.register_command('list-order', list_set_order, (settings.sort_col \|\| 'auto') != 'auto');
	rcmail.register_command('task-history', task_history_dialog, false);

	$('#taskviewsortmenu .by-' + (settings.sort_col \|\| 'auto')).attr('aria-checked', 'true').addClass('selected');
	$('#taskviewsortmenu .sortorder.' + (settings.sort_order \|\| 'asc')).attr('aria-checked', 'true').addClass('selected');

	// start loading tasks
	fetch_counts();
	list_tasks(settings.selected_filter);

	// register event handlers for UI elements
	$('#taskselector a').click(function(e) {
	if (!$(this).parent().hasClass('inactive')) {
	var selector = this.href.replace(/^.*#/, ''),
	mask = filter_masks[selector],
	shift = e.shiftKey \|\| e.ctrlKey \|\| e.metaKey;

	if (!shift)
	filtermask = mask; // reset selection on regular clicks
	else if (filtermask & mask)
	filtermask -= mask;
	else
	filtermask \|= mask;

	list_tasks();
	}
	return false;
	});

	// quick-add a task
	$(rcmail.gui_objects.quickaddform).submit(function(e){
	var tasktext = this.elements.text.value,
	rec = { id:-(++idcount), title:tasktext, readonly:true, mask:0, complete:0 };

	if (tasktext && tasktext.length) {
	save_task({ tempid:rec.id, raw:tasktext, list:me.selected_list }, 'new');
	render_task(rec);

	$('#listmessagebox').hide();
	}

	// clear form
	this.reset();
	return false;
	}).find('input[type=text]').placeholder(rcmail.gettext('createnewtask','tasklist'));

	// click-handler on tags list
	$(rcmail.gui_objects.tagslist).on('click', 'li', function(e){
	var item = e.target.nodeName == 'LI' ? $(e.target) : $(e.target).closest('li'),
	tag = item.data('value');

	if (!tag)
	return false;

	// reset selection on regular clicks
	var index = $.inArray(tag, tagsfilter);
	var shift = e.shiftKey \|\| e.ctrlKey \|\| e.metaKey;

	if (!shift) {
	if (tagsfilter.length > 1)
	index = -1;

	$('li', rcmail.gui_objects.tagslist).removeClass('selected').attr('aria-checked', 'false');
	tagsfilter = [];
	}

	// add tag to filter
	if (index < 0) {
	item.addClass('selected').attr('aria-checked', 'true');
	tagsfilter.push(tag);
	}
	else if (shift) {
	item.removeClass('selected').attr('aria-checked', 'false');
	var a = tagsfilter.slice(0,index);
	tagsfilter = a.concat(tagsfilter.slice(index+1));
	}

	list_tasks();

	// clear text selection in IE after shift+click
	if (shift && document.selection)
	document.selection.empty();

	e.preventDefault();
	return false;
	})
	.on('keypress', 'li', function(e) {
	if (e.keyCode == 13) {
	$(this).trigger('click', { pointerType:'keyboard' });
	}
	})
	.mousedown(function(e){
	// disable content selection with the mouse
	e.preventDefault();
	return false;
	});

	// click-handler on task list items (delegate)
	$(rcmail.gui_objects.resultlist).on('click', function(e){
	var item = $(e.target);
	var className = e.target.className;

	if (item.hasClass('childtoggle')) {
	item = item.parent().find('.taskhead');
	className = 'childtoggle';
	}
	else if (!item.hasClass('taskhead'))
	item = item.closest('div.taskhead');

	// ignore
	if (!item.length)
	return false;

	var id = item.data('id'),
	li = item.parent(),
	rec = listdata[id];

	switch (className) {
	case 'childtoggle':
	rec.collapsed = !rec.collapsed;
	li.children('.childtasks:first').toggle().attr('aria-hidden', rec.collapsed ? 'true' : 'false');
	$(e.target).toggleClass('collapsed').html(rec.collapsed ? '▶' : '▼');
	rcmail.http_post('tasks/task', { action:'collapse', t:{ id:rec.id, list:rec.list }, collapsed:rec.collapsed?1:0 });
	if (e.shiftKey) // expand/collapse all childs
	li.children('.childtasks:first .childtoggle.'+(rec.collapsed?'expanded':'collapsed')).click();
	break;

	case 'complete':
	if (rcmail.busy)
	return false;

	save_task_confirm(rec, 'edit', { _status_before:rec.status + '', status:e.target.checked ? 'COMPLETED' : (rec.complete > 0 ? 'IN-PROCESS' : 'NEEDS-ACTION') });
	item.toggleClass('complete');
	return true;

	case 'flagged':
	if (rcmail.busy)
	return false;

	rec.flagged = rec.flagged ? 0 : 1;
	item.toggleClass('flagged').find('.flagged:first').attr('aria-checked', (rec.flagged ? 'true' : 'false'));
	save_task(rec, 'edit');
	break;

	case 'date':
	if (rcmail.busy)
	return false;

	var link = $(e.target).html(''),
	input = $('<input type="text" size="10" />').appendTo(link).val(rec.date \|\| '')

	input.datepicker($.extend({
	onClose: function(dateText, inst) {
	if (dateText != (rec.date \|\| '')) {
	save_task_confirm(rec, 'edit', { date:dateText });
	}
	input.datepicker('destroy').remove();
	link.html(dateText \|\| rcmail.gettext('nodate','tasklist'));
	}
	}, extended_datepicker_settings)
	)
	.datepicker('setDate', rec.date)
	.datepicker('show');
	break;

	case 'delete':
	delete_task(id);
	break;

	case 'actions':
	var pos, ref = $(e.target),
	menu = $('#taskitemmenu');

	if (menu.is(':visible') && menu.data('refid') == id) {
	rcmail.command('menu-close', 'taskitemmenu');
	}
	else {
	rcmail.enable_command('task-history', me.tasklists[rec.list] && !!me.tasklists[rec.list].history);
	rcmail.command('menu-open', { menu: 'taskitemmenu', show: true }, e.target, e);
	menu.data('refid', id);
	me.selected_task = rec;
	}
	e.bubble = false;
	break;

	case 'extlink':
	return true;

	default:
	if (e.target.nodeName != 'INPUT')
	task_show_dialog(id);
	break;
	}

	return false;
	})
	.on('dblclick', '.taskhead, .childtoggle', function(e){
	var id, rec, item = $(e.target);
	if (!item.hasClass('taskhead'))
	item = item.closest('div.taskhead');

	if (!rcmail.busy && item.length && (id = item.data('id')) && (rec = listdata[id])) {
	var list = rec.list && me.tasklists[rec.list] ? me.tasklists[rec.list] : {};
	if (rec.readonly \|\| !list.editable)
	task_show_dialog(id);
	else
	task_edit_dialog(id, 'edit');
	clearSelection();
	}
	})
	.on('keydown', '.taskhead', function(e) {
	if (e.target.nodeName == 'INPUT' && e.target.type == 'text')
	return true;

	var inc = 1;
	switch (e.keyCode) {
	case 13: // Enter
	$(e.target).trigger('click', { pointerType:'keyboard' });
	return rcube_event.cancel(e);

	case 38: // Up arrow key
	inc = -1;
	case 40: // Down arrow key
	if ($(e.target).hasClass('actions')) {
	// unfold actions menu
	$(e.target).trigger('click', { pointerType:'keyboard' });
	return rcube_event.cancel(e);
	}

	// focus next/prev task item
	var x = 0, target = this, items = $(rcmail.gui_objects.resultlist).find('.taskhead:visible');
	items.each(function(i, item) {
	if (item === target) {
	x = i;
	return false;
	}
	});
	items.get(x + inc).focus();
	return rcube_event.cancel(e);

	case 37: // Left arrow key
	case 39: // Right arrow key
	$(this).parent().children('.childtoggle:visible').first().trigger('click', { pointerType:'keyboard' });
	break;
	}
	})
	.on('focusin', '.taskhead', function(e){
	if (rcube_event.is_keyboard(e)) {
	var item = $(e.target);
	if (!item.hasClass('taskhead'))
	item = item.closest('div.taskhead');

	var id = item.data('id');
	if (id && listdata[id]) {
	focused_task = id;
	focused_subclass = item.get(0) !== e.target ? e.target.className : null;
	}
	}
	})
	.on('focusout', '.taskhead', function(e){
	var item = $(e.target);
	if (focused_task && item.data('id') == focused_task) {
	focused_task = focused_subclass = null;
	}
	});

	/**
	*
	*/
	function task_rsvp(response, delegate)
	{
	if (me.selected_task && me.selected_task.attendees && response) {
	// bring up delegation dialog
	if (response == 'delegated' && !delegate) {
	rcube_libcalendaring.itip_delegate_dialog(function(data) {
	$('#reply-comment-task-rsvp').val(data.comment);
	data.rsvp = data.rsvp ? 1 : '';
	task_rsvp('delegated', data);
	});
	return;
	}

	// update attendee status
	for (var data, i=0; i < me.selected_task.attendees.length; i++) {
	data = me.selected_task.attendees[i];
	if (settings.identity.emails.indexOf(';'+String(data.email).toLowerCase()) >= 0) {
	data.status = response.toUpperCase();

	if (data.status == 'DELEGATED') {
	data['delegated-to'] = delegate.to;
	}
	else {
	delete data.rsvp; // unset RSVP flag

	if (data['delegated-to']) {
	delete data['delegated-to'];
	if (data.role == 'NON-PARTICIPANT' && data.status != 'DECLINED') {
	data.role = 'REQ-PARTICIPANT';
	}
	}
	}
	}
	}

	// submit status change to server
	saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
	rcmail.http_post('tasks/task', {
	action: 'rsvp',
	t: $.extend({}, me.selected_task, (delegate \|\| {})),
	filter: filtermask,
	status: response,
	noreply: $('#noreply-task-rsvp:checked').length ? 1 : 0,
	comment: $('#reply-comment-task-rsvp').val()
	});

	task_show_dialog(me.selected_task.id);
	}
	}

	// init RSVP widget
	$('#task-rsvp input.button').click(function(e) {
	task_rsvp($(this).attr('rel'))
	});

	// register click handler for message links
	$('#task-links, #taskedit-links').on('click', 'li a.messagelink', function(e) {
	rcmail.open_window(this.href);
	return false;
	});

	// register click handler for message delete buttons
	$('#taskedit-links').on('click', 'li a.delete', function(e) {
	remove_link(e.target);
	return false;
	});

	// extended datepicker settings
	var extended_datepicker_settings = $.extend({
	showButtonPanel: true,
	beforeShow: function(input, inst) {
	setTimeout(function(){
	$(input).datepicker('widget').find('button.ui-datepicker-close')
	.html(rcmail.gettext('nodate','tasklist'))
	.attr('onclick', '')
	.unbind('click')
	.bind('click', function(e){
	$(input).datepicker('setDate', null).datepicker('hide');
	});
	}, 1);
	}
	}, datepicker_settings);
	}

	/**
	* initialize task edit form elements
	*/
	function init_taskedit()
	{
	$('#taskedit').tabs({
	activate: function(event, ui) {
	// reset autocompletion on tab change (#3389)
	rcmail.ksearch_blur();
	}
	});

	var completeness_slider_change = function(e, ui){
	var v = completeness_slider.slider('value');
	if (v >= 98) v = 100;
	if (v <= 2) v = 0;
	$('#taskedit-completeness').val(v);
	};
	completeness_slider = $('#taskedit-completeness-slider').slider({
	range: 'min',
	animate: 'fast',
	slide: completeness_slider_change,
	change: completeness_slider_change
	});
	$('#taskedit-completeness').change(function(e){
	completeness_slider.slider('value', parseInt(this.value))
	});

	// register events on alarms and recurrence fields
	me.init_alarms_edit('#taskedit-alarms');
	me.init_recurrence_edit('#eventedit');

	$('#taskedit-date, #taskedit-startdate').datepicker(datepicker_settings);

	$('a.edit-nodate').click(function(){
	var sel = $(this).attr('rel');
	if (sel) $(sel).val('');
	return false;
	});

	// init attendees autocompletion
	var ac_props;
	// parallel autocompletion
	if (rcmail.env.autocomplete_threads > 0) {
	ac_props = {
	threads: rcmail.env.autocomplete_threads,
	sources: rcmail.env.autocomplete_sources
	};
	}
	rcmail.init_address_input_events($('#edit-attendee-name'), ac_props);
	rcmail.addEventListener('autocomplete_insert', function(e) {
	var success = false;
	if (e.field.name == 'participant') {
	success = add_attendees(e.insert, { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:(e.data && e.data.type == 'group' ? 'GROUP' : 'INDIVIDUAL') });
	}
	if (e.field && success) {
	e.field.value = '';
	}
	});

	$('#edit-attendee-add').click(function() {
	var input = $('#edit-attendee-name');
	rcmail.ksearch_blur();
	if (add_attendees(input.val(), { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'INDIVIDUAL' })) {
	input.val('');
	}
	});

	// handle change of "send invitations" checkbox
	$('#edit-attendees-invite').change(function() {
	$('#edit-attendees-donotify,input.edit-attendee-reply').prop('checked', this.checked);
	// hide/show comment field
	$('#taskeditform .attendees-commentbox')[this.checked ? 'show' : 'hide']();
	});

	// delegate change task to "send invitations" checkbox
	$('#edit-attendees-donotify').change(function() {
	$('#edit-attendees-invite').click();
	return false;
	});

	// configure drop-down menu on time input fields based on jquery UI autocomplete
	$('#taskedit-starttime, #taskedit-time, #taskedit input.edit-alarm-time').each(function() {
	me.init_time_autocomplete(this, {container: '#taskedit'});
	});
	}

	/**
	* Check permissions on the given list object
	*/
	function has_permission(list, perm)
	{
	// multiple chars means "either of"
	if (String(perm).length > 1) {
	for (var i=0; i < perm.length; i++) {
	if (has_permission(list, perm[i])) {
	return true;
	}
	}
	}

	if (list.rights && String(list.rights).indexOf(perm) >= 0) {
	return true;
	}

	return (perm == 'i' && list.editable);
	}

	/**
	* Request counts from the server
	*/
	function fetch_counts()
	{
	var active = active_lists();
	if (active.length)
	rcmail.http_request('counts', { lists:active.join(',') });
	else
	update_counts({});
	}

	/**
	* List tasks matching the given selector
	*/
	function list_tasks(sel, force)
	{
	if (rcmail.busy)
	return;

	if (sel && filter_masks[sel] !== undefined) {
	filtermask = filter_masks[sel];
	}

	var active = active_lists(),
	basefilter = filtermask & FILTER_MASK_COMPLETE ? FILTER_MASK_COMPLETE : FILTER_MASK_ALL,
	reload = force \|\| active.join(',') != loadstate.lists \|\| basefilter != loadstate.filter \|\| loadstate.search != search_query;

	if (active.length && reload) {
	ui_loading = rcmail.set_busy(true, 'loading');
	rcmail.http_request('fetch', { filter:basefilter, lists:active.join(','), q:search_query }, true);
	}
	else if (reload)
	data_ready({ data:[], lists:'', filter:basefilter, search:search_query });
	else
	render_tasklist();

	$('#taskselector li.selected').removeClass('selected').attr('aria-checked', 'false');

	// select all active selectors
	if (filtermask > 0) {
	$.each(filter_masks, function(sel, mask) {
	if (filtermask & mask)
	$('#taskselector li.'+sel).addClass('selected').attr('aria-checked', 'true');
	});
	}
	else
	$('#taskselector li.all').addClass('selected').attr('aria-checked', 'true');
	}

	/**
	* Remove all tasks of the given list from the UI
	*/
	function remove_tasks(list_id)
	{
	// remove all tasks of the given list from index
	var newindex = $.grep(listindex, function(id, i){
	return listdata[id] && listdata[id].list != list_id;
	});

	listindex = newindex;
	render_tasklist();

	// avoid reloading
	me.tasklists[list_id].active = false;
	loadstate.lists = active_lists();
	}

	// open a tasks export dialog
	this.export_tasks = function()
	{
	// close show dialog first
	var $dialog = $("#tasksexport"),
	form = rcmail.gui_objects.exportform,
	buttons = {};

	if (!form)
	return;

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	$("#task-export-list").val('');

	buttons[rcmail.gettext('export', 'tasklist')] = function() {
	var data = {},
	source = $('#task-export-list option:selected').val(),
	form_elements = $('select, input', form);

	// "current view" export, use hidden form to POST task IDs
	if (source === '') {
	var cache = {}, tasks = [], inputs = [],
	postform = $('#tasks-export-form-post');

	$.each(listindex \|\| [], function() {
	var rec = listdata[this];
	if (match_filter(rec, cache)) {
	tasks.push(rec.id);
	}
	});

	// copy form inputs, there may be controls added by other plugins
	form_elements.each(function() {
	if (this.type != 'checkbox' \|\| this.checked)
	inputs.push($('<input>').attr({type: 'hidden', name: this.name, value: this.value}));
	});

	inputs.push($('<input>').attr({type: 'hidden', name: '_token', value: rcmail.env.request_token}));
	inputs.push($('<input>').attr({type: 'hidden', name: 'id', value: tasks.join(',')}));

	if (!postform.length)
	postform = $('<form>')
	.attr({style: 'display: none', method: 'POST', action: '?_task=tasks&_action=export'})
	.appendTo('body');

	postform.html('').append(inputs).submit();
	}
	// otherwise we can use simple GET
	else {
	form_elements.each(function() {
	if (this.type != 'checkbox' \|\| this.checked)
	data[this.name] = $(this).val();
	});

	rcmail.goto_url('export', data);
	}

	$dialog.dialog("close");
	};

	buttons[rcmail.gettext('cancel', 'tasklist')] = function() {
	$dialog.dialog("close");
	};

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: false,
	closeOnEscape: false,
	title: rcmail.gettext('exporttitle', 'tasklist'),
	open: function() {
	$dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
	},
	close: function() {
	$('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
	$dialog.dialog("destroy").hide();
	},
	buttons: buttons,
	width: 520
	}).show();
	};
	/*
	// download the selected task as iCal
	this.task_download = function(task)
	{
	if (task && task.id) {
	rcmail.goto_url('export', {source: task.list, id: task.id, attachments: 1});
	}
	};
	*/

	/**
	* Modify query parameters for refresh requests
	*/
	function before_refresh(query)
	{
	query.filter = filtermask == FILTER_MASK_COMPLETE ? FILTER_MASK_COMPLETE : FILTER_MASK_ALL;
	query.lists = active_lists().join(',');
	if (search_query)
	query.q = search_query;

	return query;
	}

	/**
	* Callback if task data from server is ready
	*/
	function data_ready(response)
	{
	listdata = {};
	listindex = [];
	loadstate.lists = response.lists;
	loadstate.filter = response.filter;
	loadstate.search = response.search;

	for (var id, i=0; i < response.data.length; i++) {
	id = response.data[i].id;
	listindex.push(id);
	listdata[id] = response.data[i];
	listdata[id].children = [];
	// register a forward-pointer to child tasks
	if (listdata[id].parent_id && listdata[listdata[id].parent_id])
	listdata[listdata[id].parent_id].children.push(id);
	}

	// sort index before rendering
	listindex.sort(function(a, b) { return task_cmp(listdata[a], listdata[b]); });

	append_tags(response.tags \|\| []);
	render_tasklist();

	// show selected task dialog
	if (settings.selected_id) {
	if (listdata[settings.selected_id]) {
	task_show_dialog(settings.selected_id);
	delete settings.selected_id;
	}

	// remove _id from window location
	if (window.history.replaceState) {
	window.history.replaceState({}, document.title, rcmail.url('', { _list: me.selected_list }));
	}
	}

	rcmail.set_busy(false, 'loading', ui_loading);
	}

	/**
	*
	*/
	function render_tasklist()
	{
	// clear display
	var id, rec,
	count = 0,
	cache = {},
	activetags = {},
	msgbox = $('#listmessagebox').hide(),
	list = $(rcmail.gui_objects.resultlist).html('');

	for (var i=0; i < listindex.length; i++) {
	id = listindex[i];
	rec = listdata[id];
	if (match_filter(rec, cache)) {
	if (rcmail.env.action == 'print') {
	render_task_printmode(rec);
	continue;
	}

	render_task(rec);
	count++;

	// keep a list of tags from all visible tasks
	for (var t, j=0; rec.tags && j < rec.tags.length; j++) {
	t = rec.tags[j];
	if (typeof activetags[t] == 'undefined')
	activetags[t] = 0;
	activetags[t]++;
	}
	}
	}

	if (rcmail.env.action == 'print')
	return;

	fix_tree_toggles();
	update_tagcloud(activetags);

	if (!count) {
	msgbox.html(rcmail.gettext('notasksfound','tasklist')).show();
	rcmail.display_message(rcmail.gettext('notasksfound','tasklist'), 'voice');
	}
	}

	/**
	* Show/hide child toggle buttons on all visible task items
	*/
	function fix_tree_toggles()
	{
	$('.taskitem', rcmail.gui_objects.resultlist).each(function(i,elem){
	var li = $(elem),
	rec = listdata[li.attr('rel')],
	childs = $('.childtasks li', li);

	$('.childtoggle', li)[(childs.length ? 'show' : 'hide')]();
	})
	}

	/**
	* Expand/collapse all task items with childs
	*/
	function expand_collapse(expand)
	{
	var collapsed = !expand;

	$('.taskitem .childtasks')[(collapsed ? 'hide' : 'show')]();
	$('.taskitem .childtoggle')
	.removeClass(collapsed ? 'expanded' : 'collapsed')
	.addClass(collapsed ? 'collapsed' : 'expanded')
	.html(collapsed ? '▶' : '▼');

	// store new toggle collapse states
	var ids = [];
	for (var id in listdata) {
	if (listdata[id].children && listdata[id].children.length)
	ids.push(id);
	}
	if (ids.length) {
	rcmail.http_post('tasks/task', { action:'collapse', t:{ id:ids.join(',') }, collapsed:collapsed?1:0 });
	}
	}

	/**
	*
	*/
	function append_tags(taglist)
	{
	// find new tags
	var newtags = [];
	for (var i=0; i < taglist.length; i++) {
	if ($.inArray(taglist[i], tags) < 0)
	newtags.push(taglist[i]);
	}
	tags = tags.concat(newtags);

	// append new tags to tag cloud
	$.each(newtags, function(i, tag){
	$('<li role="checkbox" aria-checked="false" tabindex="0"></li>')
	.attr('rel', tag)
	.data('value', tag)
	.html(Q(tag) + '<span class="count"></span>')
	.appendTo(rcmail.gui_objects.tagslist)
	.draggable({
	addClasses: false,
	revert: 'invalid',
	revertDuration: 300,
	helper: tag_draggable_helper,
	start: tag_draggable_start,
	appendTo: 'body',
	cursor: 'pointer'
	});
	});

	// re-sort tags list
	$(rcmail.gui_objects.tagslist).children('li').sortElements(function(a,b){
	return $.text([a]).toLowerCase() > $.text([b]).toLowerCase() ? 1 : -1;
	});
	}

	/**
	* Display the given counts to each tag and set those inactive which don't
	* have any matching tasks in the current view.
	*/
	function update_tagcloud(counts)
	{
	// compute counts first by iterating over all visible task items
	if (typeof counts == 'undefined') {
	counts = {};
	$('li.taskitem', rcmail.gui_objects.resultlist).each(function(i,li){
	var t, id = $(li).attr('rel'),
	rec = listdata[id];
	for (var j=0; rec && rec.tags && j < rec.tags.length; j++) {
	t = rec.tags[j];
	if (typeof counts[t] == 'undefined')
	counts[t] = 0;
	counts[t]++;
	}
	});
	}

	$(rcmail.gui_objects.tagslist).children('li').each(function(i,li){
	var elem = $(li), tag = elem.attr('rel'),
	count = counts[tag] \|\| 0;

	elem.children('.count').html(count+'');
	if (count == 0) elem.addClass('inactive');
	else elem.removeClass('inactive');
	});
	}

	/* Helper functions for drag & drop functionality of tags */

	function tag_draggable_helper()
	{
	if (!tag_draghelper)
	tag_draghelper = $('<div class="tag-draghelper"></div>');
	else
	tag_draghelper.html('');

	$(this).clone().addClass('tag').appendTo(tag_draghelper);
	return tag_draghelper;
	}

	function tag_draggable_start(event, ui)
	{
	$('.taskhead').droppable({
	hoverClass: 'droptarget',
	accept: tag_droppable_accept,
	drop: tag_draggable_dropped,
	addClasses: false
	});
	}

	function tag_droppable_accept(draggable)
	{
	if (rcmail.busy)
	return false;

	var tag = draggable.data('value'),
	drop_id = $(this).data('id'),
	drop_rec = listdata[drop_id],
	list = drop_rec && me.tasklists[drop_rec.list] ? me.tasklists[drop_rec.list] : { editable:true };

	// target is not editable or already has this tag assigned
	if (!drop_rec \|\| drop_rec.readonly \|\| !has_permission(list, 'i') \|\| (drop_rec.tags && $.inArray(tag, drop_rec.tags) >= 0)) {
	return false;
	}

	return true;
	}

	function tag_draggable_dropped(event, ui)
	{
	var drop_id = $(this).data('id'),
	tag = ui.draggable.data('value'),
	rec = listdata[drop_id];

	if (rec && rec.id) {
	if (!rec.tags) rec.tags = [];
	rec.tags.push(tag);
	save_task(rec, 'edit');
	}
	}

	/**
	*
	*/
	function update_counts(counts)
	{
	// got new data
	if (counts)
	taskcounts = counts;

	// iterate over all selector links and update counts
	$('#taskselector a').each(function(i, elem){
	var link = $(elem),
	f = link.parent().attr('class').replace(/\s\w+/g, '');
	if (f != 'all')
	link.children('span').html('+' + (taskcounts[f] \|\| ''))[(taskcounts[f] ? 'show' : 'hide')]();
	});

	// spacial case: overdue
	$('#taskselector li.overdue')[(taskcounts.overdue ? 'removeClass' : 'addClass')]('inactive');
	}

	/**
	* Callback from server to update a single task item
	*/
	function update_taskitem(rec, filter)
	{
	// handle a list of task records
	if ($.isArray(rec)) {
	$.each(rec, function(i,r){ update_taskitem(r, filter); });
	return;
	}

	var id = rec.id,
	oldid = rec.tempid \|\| id,
	oldrec = listdata[oldid],
	oldindex = $.inArray(oldid, listindex),
	oldparent = oldrec ? (oldrec._old_parent_id \|\| oldrec.parent_id) : null,
	list = me.tasklists[rec.list];

	if (oldindex >= 0)
	listindex[oldindex] = id;
	else
	listindex.push(id);

	listdata[id] = rec;

	// remove child-pointer from old parent
	if (oldparent && listdata[oldparent] && oldparent != rec.parent_id) {
	var oldchilds = listdata[oldparent].children,
	i = $.inArray(oldid, oldchilds);
	if (i >= 0) {
	listdata[oldparent].children = oldchilds.slice(0,i).concat(oldchilds.slice(i+1));
	}
	}

	// register a forward-pointer to child tasks
	if (rec.parent_id && listdata[rec.parent_id] && listdata[rec.parent_id].children && $.inArray(id, listdata[rec.parent_id].children) < 0)
	listdata[rec.parent_id].children.push(id);

	// restore pointers to my children
	if (!listdata[id].children) {
	listdata[id].children = [];
	for (var pid in listdata) {
	if (listdata[pid].parent_id == id)
	listdata[id].children.push(pid);
	}
	}

	// copy _depth property from old rec or derive from parent
	if (rec.parent_id && listdata[rec.parent_id]) {
	rec._depth = (listdata[rec.parent_id]._depth \|\| 0) + 1;
	}
	else if (oldrec) {
	rec._depth = oldrec._depth \|\| 0;
	}

	if (list.active \|\| rec.tempid) {
	if (!filter \|\| match_filter(rec, {}))
	render_task(rec, oldid);
	}
	else {
	$('li[rel="'+id+'"]', rcmail.gui_objects.resultlist).remove();
	}

	append_tags(rec.tags \|\| []);
	update_tagcloud();
	fix_tree_toggles();

	// refresh currently displayed task details dialog
	if ($('#taskshow').is(':visible') && me.selected_task && me.selected_task.id == rec.id) {
	task_show_dialog(rec.id);
	}
	}

	/**
	* Submit the given (changed) task record to the server
	*/
	function save_task(rec, action)
	{
	// show confirmation dialog when status of an assigned task has changed
	if (rec._status_before !== undefined && is_attendee(rec))
	return save_task_confirm(rec, action);

	if (!rcmail.busy) {
	saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
	rcmail.http_post('tasks/task', { action:action, t:rec, filter:filtermask });
	$('button.ui-button:ui-button').button('option', 'disabled', rcmail.busy);
	return true;
	}

	return false;
	}

	/**
	* Display confirm dialog when modifying/deleting a task record
	*/
	var save_task_confirm = function(rec, action, updates)
	{
	var data = $.extend({}, rec, updates \|\| {}),
	notify = false, partstat = false, html = '',
	do_confirm = settings.itip_notify & 2;

	// task has attendees, ask whether to notify them
	if (has_attendees(rec) && is_organizer(rec)) {
	notify = true;
	if (do_confirm) {
	html = rcmail.gettext('changeconfirmnotifications', 'tasklist');
	}
	else {
	data._notify = settings.itip_notify;
	}
	}
	// ask whether to change my partstat and notify organizer
	else if (data._status_before !== undefined && data.status && data._status_before != data.status && is_attendee(rec)) {
	partstat = true;
	if (do_confirm) {
	html = rcmail.gettext('partstatupdatenotification', 'tasklist');
	}
	else if (settings.itip_notify & 1) {
	data._reportpartstat = data.status == 'CANCELLED' ? 'DECLINED' : data.status;
	}
	}

	// remove to avoid endless recursion
	delete data._status_before;

	// show dialog
	if (html) {
	var $dialog = $('<div>').html(html);

	var buttons = [];
	buttons.push({
	text: rcmail.gettext('saveandnotify', 'tasklist'),
	click: function() {
	if (notify) data._notify = 1;
	if (partstat) data._reportpartstat = data.status == 'CANCELLED' ? 'DECLINED' : data.status;
	save_task(data, action);
	$(this).dialog('close');
	}
	});
	buttons.push({
	text: rcmail.gettext('save', 'tasklist'),
	click: function() {
	save_task(data, action);
	$(this).dialog('close');
	}
	});
	buttons.push({
	text: rcmail.gettext('cancel', 'tasklist'),
	click: function() {
	$(this).dialog('close');
	if (updates)
	render_task(rec, rec.id); // restore previous state
	}
	});

	$dialog.dialog({
	modal: true,
	width: 460,
	closeOnEscapeType: false,
	dialogClass: 'warning no-close',
	title: rcmail.gettext('changetaskconfirm', 'tasklist'),
	buttons: buttons,
	open: function() {
	setTimeout(function(){
	$dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
	}, 5);
	},
	close: function(){
	$dialog.dialog('destroy').remove();
	}
	}).addClass('task-update-confirm').show();

	return true;
	}

	// do update
	return save_task(data, action);
	}

	/**
	* Remove saving lock and free the UI for new input
	*/
	function unlock_saving()
	{
	if (saving_lock) {
	rcmail.set_busy(false, null, saving_lock);
	$('button.ui-button:ui-button').button('option', 'disabled', false);
	}
	}

	/**
	* Render the given task into the tasks list
	*/
	function render_task(rec, replace)
	{
	var tags_html = '';
	for (var j=0; rec.tags && j < rec.tags.length; j++)
	tags_html += '<span class="tag">' + Q(rec.tags[j]) + '</span>';

	var label_id = rcmail.html_identifier(rec.id) + '-title';
	var div = $('<div>').addClass('taskhead').html(
	'<div class="progressbar"><div class="progressvalue" style="width:' + (rec.complete * 100) + '%"></div></div>' +
	'<input type="checkbox" name="completed[]" value="1" class="complete" aria-label="' + rcmail.gettext('complete','tasklist') + '" ' + (is_complete(rec) ? 'checked="checked" ' : '') + '/>' +
	'<span class="flagged" role="checkbox" tabindex="0" aria-checked="' + (rec.flagged ? 'true' : 'false') + '" aria-label="' + rcmail.gettext('flagged','tasklist') + '"></span>' +
	'<span class="title" id="' + label_id + '">' + text2html(Q(rec.title)) + '</span>' +
	'<span class="tags">' + tags_html + '</span>' +
	'<span class="date">' + Q(rec.date \|\| rcmail.gettext('nodate','tasklist')) + '</span>' +
	'<a href="#" class="actions" aria-haspopup="true" aria-expanded="false">' + rcmail.gettext('taskactions','tasklist') + '</a>'
	)
	.attr('tabindex', '0')
	.attr('aria-labelledby', label_id)
	.data('id', rec.id)
	.draggable({
	revert: 'invalid',
	addClasses: false,
	cursorAt: { left:-10, top:12 },
	helper: task_draggable_helper,
	appendTo: 'body',
	start: task_draggable_start,
	stop: task_draggable_stop,
	drag: task_draggable_move,
	revertDuration: 300
	});

	if (is_complete(rec))
	div.addClass('complete');
	if (rec.flagged)
	div.addClass('flagged');
	if (!rec.date)
	div.addClass('nodate');
	if ((rec.mask & FILTER_MASK_OVERDUE))
	div.addClass('overdue');

	var li, inplace = false, parent = rec.parent_id ? $('li[rel="'+rec.parent_id+'"] > ul.childtasks', rcmail.gui_objects.resultlist) : null;
	if (replace && (li = $('li[rel="'+replace+'"]', rcmail.gui_objects.resultlist)) && li.length) {
	li.children('div.taskhead').first().replaceWith(div);
	li.attr('rel', rec.id);
	inplace = true;
	}
	else {
	li = $('<li role="treeitem">')
	.attr('rel', rec.id)
	.addClass('taskitem')
	.append((rec.collapsed ? '<span class="childtoggle collapsed">▶' : '<span class="childtoggle expanded">▼') + '</span>')
	.append(div)
	.append('<ul class="childtasks" role="group" style="' + (rec.collapsed ? 'display:none' : '') + '" aria-hidden="' + (rec.collapsed ? 'true' : 'false') +'"></ul>');

	if (!parent \|\| !parent.length)
	li.appendTo(rcmail.gui_objects.resultlist);
	}

	if (!inplace && parent && parent.length)
	li.appendTo(parent);

	if (replace) {
	resort_task(rec, li, true);
	// TODO: remove the item after a while if it doesn't match the current filter anymore
	}

	// re-set focus to taskhead element after DOM update
	if (focused_task == rec.id) {
	focus_task(li);
	}
	}

	/**
	* Render the given task into the tasks list (in print mode)
	*/
	function render_task_printmode(rec)
	{
	var label_id = rcmail.html_identifier(rec.id) + '-title',
	div = $('<div>').addClass('taskhead')
	.append($('<span class="title">').attr('id', label_id).text(rec.title)),
	parent = rec.parent_id ? $('li[rel="'+rec.parent_id+'"] > ul.childtasks', rcmail.gui_objects.resultlist) : null,
	li = $('<li role="treeitem">').attr('rel', rec.id).addClass('taskitem')
	.append(div)
	.append('<ul class="childtasks" role="group"></ul>');

	if (rec.description)
	div.append($('<span class="description">').text(rec.description));
	/*
	if (is_complete(rec))
	div.addClass('complete');
	if (rec.flagged)
	div.addClass('flagged');
	if (!rec.date)
	div.addClass('nodate');
	if (rec.mask & FILTER_MASK_OVERDUE)
	div.addClass('overdue');
	*/
	if (!parent \|\| !parent.length)
	li.appendTo(rcmail.gui_objects.resultlist);
	else
	li.appendTo(parent);
	}

	/**
	* Move the given task item to the right place in the list
	*/
	function resort_task(rec, li, animated)
	{
	var dir = 0, index, slice, cmp, next_li, next_id, next_rec, insert_after, past_myself;

	// animated moving
	var insert_animated = function(li, before, after) {
	if (before && li.next().get(0) == before.get(0))
	return; // nothing to do
	else if (after && li.prev().get(0) == after.get(0))
	return; // nothing to do

	var speed = 300;
	li.slideUp(speed, function(){
	if (before) li.insertBefore(before);
	else if (after) li.insertAfter(after);
	li.slideDown(speed, function(){
	if (focused_task == rec.id) {
	focus_task(li);
	}
	});
	});
	}

	// remove from list index
	var oldlist = listindex.join('%%%');
	var oldindex = $.inArray(rec.id, listindex);
	if (oldindex >= 0) {
	slice = listindex.slice(0,oldindex);
	listindex = slice.concat(listindex.slice(oldindex+1));
	}

	// find the right place to insert the task item
	li.parent().children('.taskitem').each(function(i, elem){
	next_li = $(elem);
	next_id = next_li.attr('rel');
	next_rec = listdata[next_id];

	if (next_id == rec.id) {
	past_myself = true;
	return 1; // continue
	}

	cmp = next_rec ? task_cmp(rec, next_rec) : 0;

	if (cmp > 0 \|\| (cmp == 0 && !past_myself)) {
	insert_after = next_li;
	return 1; // continue;
	}
	else if (next_li && cmp < 0) {
	if (animated) insert_animated(li, next_li);
	else li.insertBefore(next_li);
	index = $.inArray(next_id, listindex);
	return false; // break
	}
	});

	if (insert_after) {
	if (animated) insert_animated(li, null, insert_after);
	else li.insertAfter(insert_after);

	next_id = insert_after.attr('rel');
	index = $.inArray(next_id, listindex);
	}

	// insert into list index
	if (next_id && index >= 0) {
	slice = listindex.slice(0,index);
	slice.push(rec.id);
	listindex = slice.concat(listindex.slice(index));
	}
	else { // restore old list index
	listindex = oldlist.split('%%%');
	}
	}

	/**
	* Compare function of two task records.
	* (used for sorting)
	*/
	function task_cmp(a, b)
	{
	// sort by hierarchy level first
	if ((a._depth \|\| 0) != (b._depth \|\| 0))
	return a._depth - b._depth;

	var p, alt, inv = 1, c = is_complete(a) - is_complete(b), d = c;

	// completed tasks always move to the end
	if (c != 0)
	return c;

	// custom sorting
	if (settings.sort_col && settings.sort_col != 'auto') {
	alt = settings.sort_col == 'datetime' \|\| settings.sort_col == 'startdatetime' ? 99999999999 : 0
	d = (a[settings.sort_col]\|\|alt) - (b[settings.sort_col]\|\|alt);
	inv = settings.sort_order == 'desc' ? -1 : 1;
	}
	// default sorting (auto)
	else {
	if (!d) d = (b._hasdate-0) - (a._hasdate-0);
	if (!d) d = (a.datetime\|\|99999999999) - (b.datetime\|\|99999999999);
	}

	// fall-back to created/changed date
	if (!d) d = (a.created\|\|0) - (b.created\|\|0);
	if (!d) d = (a.changed\|\|0) - (b.changed\|\|0);

	return d * inv;
	}

	/**
	* Set focus on the given task item after DOM update
	*/
	function focus_task(li)
	{
	var selector = '.taskhead';
	if (focused_subclass)
	selector += ' .' + focused_subclass
	li.find(selector).focus();
	}

	/**
	* Determine whether the given task should be displayed as "complete"
	*/
	function is_complete(rec)
	{
	return ((rec.complete == 1.0 && !rec.status) \|\| rec.status === 'COMPLETED') ? 1 : 0;
	}

	/**
	*
	*/
	function get_all_childs(id)
	{
	var cid, childs = [];
	for (var i=0; listdata[id].children && i < listdata[id].children.length; i++) {
	cid = listdata[id].children[i];
	childs.push(cid);
	childs = childs.concat(get_all_childs(cid));
	}

	return childs;
	}


	/* Helper functions for drag & drop functionality */

	function task_draggable_helper()
	{
	if (!task_draghelper)
	task_draghelper = $('<div class="taskitem-draghelper">✔</div>');

	return task_draghelper;
	}

	function task_draggable_start(event, ui)
	{
	var opts = {
	hoverClass: 'droptarget',
	accept: task_droppable_accept,
	drop: task_draggable_dropped,
	addClasses: false
	};

	$('.taskhead, #rootdroppable').droppable(opts);
	tasklists_widget.droppable(opts);

	$(this).parent().addClass('dragging');
	$('#rootdroppable').show();

	// enable auto-scrolling of list container
	var container = $(rcmail.gui_objects.resultlist);
	if (container.height() > container.parent().height()) {
	task_drag_active = true;
	list_scroll_top = container.parent().scrollTop();
	}
	}

	function task_draggable_move(event, ui)
	{
	var scroll = 0,
	mouse = rcube_event.get_mouse_pos(event),
	container = $(rcmail.gui_objects.resultlist);

	mouse.y -= container.parent().offset().top;

	if (mouse.y < scroll_sensitivity && list_scroll_top > 0) {
	scroll = -1; // up
	}
	else if (mouse.y > container.parent().height() - scroll_sensitivity) {
	scroll = 1; // down
	}

	if (task_drag_active && scroll != 0) {
	if (!scroll_timer)
	scroll_timer = window.setTimeout(function(){ tasklist_drag_scroll(container, scroll); }, scroll_delay);
	}
	else if (scroll_timer) {
	window.clearTimeout(scroll_timer);
	scroll_timer = null;
	}
	}

	function task_draggable_stop(event, ui)
	{
	$(this).parent().removeClass('dragging');
	$('#rootdroppable').hide();
	task_drag_active = false;
	}

	function task_droppable_accept(draggable)
	{
	if (rcmail.busy)
	return false;

	var drag_id = draggable.data('id'),
	drop_id = $(this).data('id'),
	drag_rec = listdata[drag_id] \|\| {},
	drop_rec = listdata[drop_id];

	// drop target is another list
	if (drag_rec && $(this).data('type') == 'tasklist') {
	var drop_list = me.tasklists[drop_id],
	from_list = me.tasklists[drag_rec.list];
	return !drag_rec.parent_id && drop_id != drag_rec.list && drop_list && drop_list.editable && from_list && from_list.editable;
	}

	if (drop_rec && drop_rec.list != drag_rec.list)
	return false;

	if (drop_id == drag_rec.parent_id)
	return false;

	while (drop_rec && drop_rec.parent_id) {
	if (drop_rec.parent_id == drag_id)
	return false;
	drop_rec = listdata[drop_rec.parent_id];
	}

	return true;
	}

	function task_draggable_dropped(event, ui)
	{
	var drop_id = $(this).data('id'),
	task_id = ui.draggable.data('id'),
	rec = listdata[task_id],
	parent, li;

	// dropped on another list -> move
	if ($(this).data('type') == 'tasklist') {
	if (rec) {
	save_task({ id:rec.id, list:drop_id, _fromlist:rec.list }, 'move');
	rec.list = drop_id;
	}
	}
	// dropped on a new parent task or root
	else {
	parent = drop_id ? $('li[rel="'+drop_id+'"] > ul.childtasks', rcmail.gui_objects.resultlist) : $(rcmail.gui_objects.resultlist)

	if (rec && parent.length) {
	// submit changes to server
	rec._old_parent_id = rec.parent_id;
	rec.parent_id = drop_id \|\| 0;
	save_task(rec, 'edit');

	li = ui.draggable.parent();
	li.slideUp(300, function(){
	li.appendTo(parent);
	resort_task(rec, li);
	li.slideDown(300);
	fix_tree_toggles();
	});
	}
	}
	}

	/**
	* Scroll list container in the given direction
	*/
	function tasklist_drag_scroll(container, dir)
	{
	if (!task_drag_active)
	return;

	var old_top = list_scroll_top;
	container.parent().get(0).scrollTop += scroll_step * dir;
	list_scroll_top = container.parent().scrollTop();
	scroll_timer = null;

	if (list_scroll_top != old_top)
	scroll_timer = window.setTimeout(function(){ tasklist_drag_scroll(container, dir); }, scroll_speed);
	}

	// check if the task has 'real' attendees, excluding the current user
	var has_attendees = function(task)
	{
	return !!(task.attendees && task.attendees.length && (task.attendees.length > 1 \|\| String(task.attendees[0].email).toLowerCase() != settings.identity.email));
	};

	// check if the current user is an attendee of this task
	var is_attendee = function(task, email, role)
	{
	var i, attendee, emails = email ? ';' + email.toLowerCase() : settings.identity.emails;

	for (i=0; task.attendees && i < task.attendees.length; i++) {
	attendee = task.attendees[i];
	if ((!role \|\| attendee.role == role) && attendee.email && emails.indexOf(';'+attendee.email.toLowerCase()) >= 0) {
	return attendee;
	}
	}

	return false;
	};

	// check if the current user is the organizer
	var is_organizer = function(task, email)
	{
	if (!email) email = task.organizer ? task.organizer.email : null;
	if (email)
	return settings.identity.emails.indexOf(';'+email) >= 0;
	return true;
	};

	// add the given list of participants
	var add_attendees = function(names, params)
	{
	names = explode_quoted_string(names.replace(/,\s*$/, ''), ',');

	// parse name/email pairs
	var i, item, email, name, success = false;
	for (i=0; i < names.length; i++) {
	email = name = '';
	item = $.trim(names[i]);

	if (!item.length) {
	continue;
	}
	// address in brackets without name (do nothing)
	else if (item.match(/^<[^@]+@[^>]+>$/)) {
	email = item.replace(/[<>]/g, '');
	}
	// address without brackets and without name (add brackets)
	else if (rcube_check_email(item)) {
	email = item;
	}
	// address with name
	else if (item.match(/([^\s<@]+@[^>]+)>*$/)) {
	email = RegExp.$1;
	name = item.replace(email, '').replace(/^["\s<>]+/, '').replace(/["\s<>]+$/, '');
	}

	if (email) {
	add_attendee($.extend({ email:email, name:name }, params));
	success = true;
	}
	else {
	alert(rcmail.gettext('noemailwarning'));
	}
	}

	return success;
	};

	// add the given attendee to the list
	var add_attendee = function(data, readonly, before)
	{
	if (!me.selected_task)
	return false;

	// check for dupes...
	var exists = false;
	$.each(task_attendees, function(i, v) { exists \|= (v.email == data.email); });
	if (exists)
	return false;

	var dispname = Q(data.name \|\| data.email);
	if (data.email)
	dispname = '<a href="mailto:' + data.email + '" title="' + Q(data.email) + '" class="mailtolink" data-cutype="' + data.cutype + '">' + dispname + '</a>';

	// delete icon
	var icon = rcmail.env.deleteicon ? '<img src="' + rcmail.env.deleteicon + '" alt="" />' : rcmail.gettext('delete');
	var dellink = '<a href="#delete" class="iconlink delete deletelink" title="' + Q(rcmail.gettext('delete')) + '">' + icon + '</a>';
	var tooltip, status = (data.status \|\| '').toLowerCase(),
	status_label = rcmail.gettext('status' + status, 'libcalendaring');

	// send invitation checkbox
	var invbox = '<input type="checkbox" class="edit-attendee-reply" value="' + Q(data.email) +'" title="' + Q(rcmail.gettext('tasklist.sendinvitations')) + '" '
	+ (!data.noreply && settings.itip_notify & 1 ? 'checked="checked" ' : '') + '/>';

	if (data['delegated-to'])
	- tooltip = rcmail.gettext('delegatedto', 'tasklist') + data['delegated-to'];
	+ tooltip = rcmail.gettext('libcalendaring.delegatedto') + ' ' + data['delegated-to'];
	else if (data['delegated-from'])
	- tooltip = rcmail.gettext('delegatedfrom', 'tasklist') + data['delegated-from'];
	+ tooltip = rcmail.gettext('libcalendaring.delegatedfrom') + ' ' + data['delegated-from'];
	else if (status)
	tooltip = status_label;

	// add expand button for groups
	if (data.cutype == 'GROUP') {
	dispname += ' <a href="#expand" data-email="' + Q(data.email) + '" class="iconbutton add expandlink" title="' + rcmail.gettext('expandattendeegroup','libcalendaring') + '">' +
	rcmail.gettext('expandattendeegroup','libcalendaring') + '</a>';
	}

	var html = '<td class="name"><span class="attendee-name">' + dispname + '</span></td>' +
	'<td class="confirmstate"><span class="' + status + '" title="' + Q(tooltip) + '">' + Q(status ? status_label : '') + '</span></td>' +
	(data.cutype != 'RESOURCE' ? '<td class="invite">' + (readonly \|\| !invbox ? '' : invbox) + '</td>' : '') +
	'<td class="options">' + (readonly ? '' : dellink) + '</td>';

	var tr = $('<tr>')
	.addClass(String(data.role).toLowerCase())
	.html(html);

	if (before)
	tr.insertBefore(before)
	else
	tr.appendTo(attendees_list);

	tr.find('a.deletelink').click({ id:(data.email \|\| data.name) }, function(e) { remove_attendee(this, e.data.id); return false; });
	tr.find('a.mailtolink').click(task_attendee_click);
	tr.find('a.expandlink').click(data, function(e) { me.expand_attendee_group(e, add_attendee, remove_attendee); return false; });
	tr.find('input.edit-attendee-reply').click(function() {
	var enabled = $('#edit-attendees-invite:checked').length \|\| $('input.edit-attendee-reply:checked').length;
	$('#taskeditform .attendees-commentbox')[enabled ? 'show' : 'hide']();
	});

	task_attendees.push(data);
	return true;
	};

	// event handler for clicks on an attendee link
	var task_attendee_click = function(e)
	{
	var mailto = this.href.substr(7);
	rcmail.command('compose', mailto);

	return false;
	};

	// remove an attendee from the list
	var remove_attendee = function(elem, id)
	{
	$(elem).closest('tr').remove();
	task_attendees = $.grep(task_attendees, function(data) { return (data.name != id && data.email != id) });
	};

	/**
	* Show task details in a dialog
	*/
	function task_show_dialog(id, data, temp)
	{
	var $dialog = $('#taskshow'), rec, list;

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	// remove status-* classes
	$dialog.removeClass(function(i, oldclass) {
	var oldies = String(oldclass).split(' ');
	return $.grep(oldies, function(cls) { return cls.indexOf('status-') === 0 }).join(' ');
	});

	if (!(rec = (data \|\| listdata[id])) \|\| (rcmail.menu_stack && rcmail.menu_stack.length > 0))
	return;

	me.selected_task = rec;
	list = rec.list && me.tasklists[rec.list] ? me.tasklists[rec.list] : {};

	// fill dialog data
	$('#task-parent-title').html(Q(rec.parent_title \|\| '')+' »').css('display', rec.parent_title ? 'block' : 'none');
	$('#task-title').html(text2html(Q(rec.title \|\| '')));
	$('#task-description').html(text2html(rec.description \|\| '', 300, 6))[(rec.description ? 'show' : 'hide')]();
	$('#task-date')[(rec.date ? 'show' : 'hide')]().children('.task-text').html(Q(rec.date \|\| rcmail.gettext('nodate','tasklist')));
	$('#task-time').html(Q(rec.time \|\| ''));
	$('#task-start')[(rec.startdate ? 'show' : 'hide')]().children('.task-text').html(Q(rec.startdate \|\| ''));
	$('#task-starttime').html(Q(rec.starttime \|\| ''));
	$('#task-alarm')[(rec.alarms_text ? 'show' : 'hide')]().children('.task-text').html(Q(rec.alarms_text));
	$('#task-completeness .task-text').html(((rec.complete \|\| 0) * 100) + '%');
	$('#task-status')[(rec.status ? 'show' : 'hide')]().children('.task-text').html(rcmail.gettext('status-'+String(rec.status).toLowerCase(),'tasklist'));
	$('#task-list .task-text').html(Q(me.tasklists[rec.list] ? me.tasklists[rec.list].name : ''));
	$('#task-attendees, #task-organizer, #task-created-changed, #task-rsvp, #task-rsvp-comment').hide();

	var itags = get_inherited_tags(rec);
	var taglist = $('#task-tags')[(rec.tags && rec.tags.length \|\| itags.length ? 'show' : 'hide')]().children('.task-text').empty();
	if (rec.tags && rec.tags.length) {
	$.each(rec.tags, function(i,val){
	$('<span>').addClass('tag-element').html(Q(val)).appendTo(taglist);
	});
	}

	// append inherited tags
	if (itags.length) {
	$.each(itags, function(i,val){
	if (!rec.tags \|\| $.inArray(val, rec.tags) < 0)
	$('<span>').addClass('tag-element inherit').html(Q(val)).appendTo(taglist);
	});
	// re-sort tags list
	$(taglist).children().sortElements(function(a,b){
	return $.text([a]).toLowerCase() > $.text([b]).toLowerCase() ? 1 : -1;
	});
	}

	if (rec.status) {
	$dialog.addClass('status-' + String(rec.status).toLowerCase());
	}

	if (rec.flagged) {
	$dialog.addClass('status-flagged');
	}

	if (rec.recurrence && rec.recurrence_text) {
	$('#task-recurrence').show().children('.task-text').html(Q(rec.recurrence_text));
	}
	else {
	$('#task-recurrence').hide();
	}

	if (rec.created \|\| rec.changed) {
	$('#task-created-changed .task-created').html(Q(rec.created_ \|\| rcmail.gettext('unknown','tasklist')))
	$('#task-created-changed .task-changed').html(Q(rec.changed_ \|\| rcmail.gettext('unknown','tasklist')))
	$('#task-created-changed').show()
	}

	// build attachments list
	$('#task-attachments').hide();
	if ($.isArray(rec.attachments)) {
	task_show_attachments(rec.attachments \|\| [], $('#task-attachments').children('.task-text'), rec);
	if (rec.attachments.length > 0) {
	$('#task-attachments').show();
	}
	}

	// build attachments list
	$('#task-links').hide();
	if ($.isArray(rec.links) && rec.links.length) {
	render_message_links(rec.links \|\| [], $('#task-links').children('.task-text'), false, 'tasklist');
	$('#task-links').show();
	}

	// list task attendees
	if (list.attendees && rec.attendees) {
	/*
	// sort resources to the end
	rec.attendees.sort(function(a,b) {
	var j = a.cutype == 'RESOURCE' ? 1 : 0,
	k = b.cutype == 'RESOURCE' ? 1 : 0;
	return (j - k);
	});
	*/
	var j, data, rsvp = false, mystatus = null, line, morelink, html = '', overflow = '',
	organizer = is_organizer(rec);

	for (j=0; j < rec.attendees.length; j++) {
	data = rec.attendees[j];

	if (data.email && settings.identity.emails.indexOf(';'+data.email) >= 0) {
	mystatus = data.status.toLowerCase();
	if (data.status == 'NEEDS-ACTION' \|\| data.status == 'TENTATIVE' \|\| data.rsvp)
	rsvp = mystatus;
	}

	line = rcube_libcalendaring.attendee_html(data);

	if (morelink)
	overflow += line;
	else
	html += line;

	// stop listing attendees
	if (j == 7 && rec.attendees.length >= 7) {
	morelink = $('<a href="#more" class="morelink"></a>').html(rcmail.gettext('andnmore', 'tasklist').replace('$nr', rec.attendees.length - j - 1));
	}
	}

	if (html) {
	$('#task-attendees').show()
	.children('.task-text')
	.html(html)
	.find('a.mailtolink').click(task_attendee_click);

	// display all attendees in a popup when clicking the "more" link
	if (morelink) {
	$('#task-attendees .task-text').append(morelink);
	morelink.click(function(e) {
	rcmail.show_popup_dialog(
	'<div id="all-task-attendees" class="task-attendees">' + html + overflow + '</div>',
	rcmail.gettext('tabattendees', 'tasklist'),
	null,
	{width: 450, modal: false}
	);
	$('#all-task-attendees a.mailtolink').click(task_attendee_click);
	return false;
	});
	}
	}
	/*
	if (mystatus && !rsvp) {
	$('#task-partstat').show().children('.changersvp')
	.removeClass('accepted tentative declined delegated needs-action')
	.addClass(mystatus)
	.children('.task-text')
	.html(rcmail.gettext('status' + mystatus, 'libcalendaring'));
	}
	*/
	var show_rsvp = !temp && rsvp && list.editable && !is_organizer(rec) && rec.status != 'CANCELLED';
	$('#task-rsvp')[(show_rsvp ? 'show' : 'hide')]();
	$('#task-rsvp .rsvp-buttons input').prop('disabled', false).filter('input[rel='+mystatus+']').prop('disabled', true);

	if (show_rsvp && rec.comment) {
	$('#task-rsvp-comment').show().children('.task-text').html(Q(rec.comment));
	}
	$('#task-rsvp a.reply-comment-toggle').show();
	$('#task-rsvp .itip-reply-comment textarea').hide().val('');

	if (rec.organizer && !organizer) {
	$('#task-organizer').show().children('.task-text').html(rcube_libcalendaring.attendee_html($.extend(rec.organizer, { role:'ORGANIZER' })));
	}
	}

	// define dialog buttons
	var buttons = [];
	if (list.editable && !rec.readonly) {
	buttons.push({
	text: rcmail.gettext('edit','tasklist'),
	click: function() {
	task_edit_dialog(me.selected_task.id, 'edit');
	},
	disabled: rcmail.busy
	});
	}

	if (has_permission(list, 'td') && !rec.readonly) {
	buttons.push({
	text: rcmail.gettext('delete','tasklist'),
	'class': 'delete',
	click: function() {
	if (delete_task(me.selected_task.id))
	$dialog.dialog('close');
	},
	disabled: rcmail.busy
	});
	}

	// open jquery UI dialog
	$dialog.dialog({
	modal: false,
	resizable: true,
	closeOnEscape: true,
	title: rcmail.gettext('taskdetails', 'tasklist'),
	open: function() {
	$dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
	},
	close: function() {
	$dialog.dialog('destroy').appendTo(document.body);
	$('.libcal-rsvp-replymode').hide();
	},
	dragStart: function() {
	$('.libcal-rsvp-replymode').hide();
	},
	resizeStart: function() {
	$('.libcal-rsvp-replymode').hide();
	},
	buttons: buttons,
	minWidth: 500,
	width: 580
	}).show();

	// set dialog size according to content
	me.dialog_resize($dialog.get(0), $dialog.height(), 580);
	}

	/**
	*
	*/
	function task_history_dialog()
	{
	var dialog, rec = me.selected_task;
	if (!rec \|\| !rec.id \|\| !window.libkolab_audittrail) {
	return false;
	}

	// render dialog
	$dialog = libkolab_audittrail.object_history_dialog({
	module: 'tasklist',
	container: '#taskhistory',
	title: rcmail.gettext('objectchangelog','tasklist') + ' - ' + rec.title,

	// callback function for list actions
	listfunc: function(action, rev) {
	var rec = $dialog.data('rec');
	saving_lock = rcmail.set_busy(true, 'loading', saving_lock);
	rcmail.http_post('task', { action: action, t: { id: rec.id, list:rec.list, rev: rev } }, saving_lock);
	},

	// callback function for comparing two object revisions
	comparefunc: function(rev1, rev2) {
	var rec = $dialog.data('rec');
	saving_lock = rcmail.set_busy(true, 'loading', saving_lock);
	rcmail.http_post('task', { action:'diff', t: { id: rec.id, list: rec.list, rev1: rev1, rev2: rev2 } }, saving_lock);
	}
	});

	$dialog.data('rec', rec);

	// fetch changelog data
	saving_lock = rcmail.set_busy(true, 'loading', saving_lock);
	rcmail.http_post('task', { action: 'changelog', t: { id: rec.id, list: rec.list } }, saving_lock);
	}

	/**
	*
	*/
	function task_render_changelog(data)
	{
	var $dialog = $('#taskhistory'),
	rec = $dialog.data('rec');

	if (data === false \|\| !data.length \|\| !rec) {
	// display 'unavailable' message
	$('<div class="notfound-message task-dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','tasklist') + '</div>')
	.insertBefore($dialog.find('.changelog-table').hide());
	return;
	}

	data.module = 'tasklist';
	libkolab_audittrail.render_changelog(data, rec, me.tasklists[rec.list]);

	// set dialog size according to content
	me.dialog_resize($dialog.get(0), $dialog.height(), 600);
	}

	/**
	*
	*/
	function task_show_diff(data)
	{
	var rec = me.selected_task,
	$dialog = $("#taskdiff");

	$dialog.find('div.form-section, h2.task-title-new').hide().data('set', false).find('.index').html('');
	$dialog.find('div.form-section.clone').remove();

	// always show event title and date
	$('.task-title', $dialog).text(rec.title).removeClass('task-text-old').show();

	// show each property change
	$.each(data.changes, function(i, change) {
	var prop = change.property, r2, html = false,
	row = $('div.task-' + prop, $dialog).first();

	// special case: title
	if (prop == 'title') {
	$('.task-title', $dialog).addClass('task-text-old').text(change['old'] \|\| '--');
	$('.task-title-new', $dialog).text(change['new'] \|\| '--').show();
	}

	// no display container for this property
	if (!row.length) {
	return true;
	}

	// clone row if already exists
	if (row.data('set')) {
	r2 = row.clone().addClass('clone').insertAfter(row);
	row = r2;
	}

	// render description text
	if (prop == 'description') {
	if (!change.diff_ && change['old']) change.old_ = text2html(change['old']);
	if (!change.diff_ && change['new']) change.new_ = text2html(change['new']);
	html = true;
	}
	// format attendees struct
	else if (prop == 'attendees') {
	if (change['old']) change.old_ = rcube_libcalendaring.attendee_html(change['old']);
	if (change['new']) change.new_ = rcube_libcalendaring.attendee_html($.extend({}, change['old'] \|\| {}, change['new']));
	html = true;
	}
	// localize status
	else if (prop == 'status') {
	if (change['old']) change.old_ = rcmail.gettext('status-'+String(change['old']).toLowerCase(), 'tasklist');
	if (change['new']) change.new_ = rcmail.gettext('status-'+String(change['new']).toLowerCase(), 'tasklist');
	}

	// format attachments struct
	if (prop == 'attachments') {
	if (change['old']) task_show_attachments([change['old']], row.children('.task-text-old'), rec, false);
	else row.children('.task-text-old').text('--');
	if (change['new']) task_show_attachments([$.extend({}, change['old'] \|\| {}, change['new'])], row.children('.task-text-new'), rec, false);
	else row.children('.task-text-new').text('--');
	// remove click handler in diff view
	$('.attachmentslist li a', row).unbind('click').removeAttr('href');
	}
	else if (change.diff_) {
	row.children('.task-text-diff').html(change.diff_);
	row.children('.task-text-old, .task-text-new').hide();
	}
	else {
	if (!html) {
	// escape HTML characters
	change.old_ = Q(change.old_ \|\| change['old'] \|\| '--')
	change.new_ = Q(change.new_ \|\| change['new'] \|\| '--')
	}
	row.children('.task-text-old').html(change.old_ \|\| change['old'] \|\| '--').show();
	row.children('.task-text-new').html(change.new_ \|\| change['new'] \|\| '--').show();
	}

	// display index number
	if (typeof change.index != 'undefined') {
	row.find('.index').html('(' + change.index + ')');
	}

	row.show().data('set', true);
	});

	// open jquery UI dialog
	$dialog.dialog({
	modal: false,
	resizable: true,
	closeOnEscape: true,
	title: rcmail.gettext('objectdiff','tasklist').replace('$rev1', data.rev1).replace('$rev2', data.rev2) + ' - ' + rec.title,
	open: function() {
	$dialog.attr('aria-hidden', 'false');
	},
	close: function() {
	$dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
	},
	buttons: [
	{
	text: rcmail.gettext('close'),
	click: function() { $dialog.dialog('close'); },
	autofocus: true
	}
	],
	minWidth: 320,
	width: 450
	}).show();

	// set dialog size according to content
	me.dialog_resize($dialog.get(0), $dialog.height(), 400);
	}

	// close the event history dialog
	function close_history_dialog()
	{
	$('#taskhistory, #taskdiff').each(function(i, elem) {
	var $dialog = $(elem);
	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');
	});
	};

	/**
	* Opens the dialog to edit a task
	*/
	function task_edit_dialog(id, action, presets)
	{
	$('#taskshow:ui-dialog').dialog('close');

	var selected_list, rec = listdata[id] \|\| presets,
	$dialog = $('<div>'),
	editform = $('#taskedit'),
	list = rec.list && me.tasklists[rec.list] ? me.tasklists[rec.list] :
	(me.selected_list ? me.tasklists[me.selected_list] : { editable: action == 'new', rights: action == 'new' ? 'rwitd' : 'r' });

	if (rcmail.busy \|\| !has_permission(list, 'i') \|\| (action == 'edit' && (!rec \|\| rec.readonly)))
	return false;

	me.selected_task = $.extend({ valarms:[] }, rec); // clone task object
	rec = me.selected_task;

	// assign temporary id
	if (!me.selected_task.id)
	me.selected_task.id = -(++idcount);

	// reset dialog first
	$('#taskeditform').get(0).reset();

	// allow other plugins to do actions when task form is opened
	rcmail.triggerEvent('tasklist-task-init', {o: rec});

	// fill form data
	var title = $('#taskedit-title').val(rec.title \|\| '');
	var description = $('#taskedit-description').val(rec.description \|\| '');
	var recdate = $('#taskedit-date').val(rec.date \|\| '');
	var rectime = $('#taskedit-time').val(rec.time \|\| '');
	var recstartdate = $('#taskedit-startdate').val(rec.startdate \|\| '');
	var recstarttime = $('#taskedit-starttime').val(rec.starttime \|\| '');
	var complete = $('#taskedit-completeness').val((rec.complete \|\| 0) * 100);
	completeness_slider.slider('value', complete.val());
	var taskstatus = $('#taskedit-status').val(rec.status \|\| '');
	var tasklist = $('#taskedit-tasklist').prop('disabled', rec.parent_id ? true : false);
	var notify = $('#edit-attendees-donotify').get(0);
	var invite = $('#edit-attendees-invite').get(0);
	var comment = $('#edit-attendees-comment');

	invite.checked = settings.itip_notify & 1 > 0;
	notify.checked = has_attendees(rec) && invite.checked;

	// set tasklist selection according to permissions
	tasklist.find('option').each(function(i, opt) {
	var l = me.tasklists[opt.value] \|\| {},
	writable = l.editable \|\| (action == 'new' && has_permission(l, 'i'));
	$(opt).prop('disabled', !writable);

	if (!selected_list && writable)
	selected_list = opt.value;
	});

	tasklist.val(rec.list \|\| me.selected_list \|\| selected_list);

	// tag-edit line
	var tagline = $(rcmail.gui_objects.edittagline).empty();
	$.each(typeof rec.tags == 'object' && rec.tags.length ? rec.tags : [''], function(i,val){
	$('<input>')
	.attr('name', 'tags[]')
	.attr('tabindex', '0')
	.addClass('tag')
	.val(val)
	.appendTo(tagline);
	});

	$('input.tag', rcmail.gui_objects.edittagline).tagedit({
	animSpeed: 100,
	allowEdit: false,
	checkNewEntriesCaseSensitive: false,
	autocompleteOptions: { source: tags, minLength: 0, noCheck: true, appendTo:'#taskedit' },
	texts: { removeLinkTitle: rcmail.gettext('removetag', 'tasklist') }
	});

	// set alarm(s)
	me.set_alarms_edit('#taskedit-alarms', action != 'new' && rec.valarms ? rec.valarms : []);

	if ($.isArray(rec.links) && rec.links.length) {
	render_message_links(rec.links, $('#taskedit-links .task-text'), true, 'tasklist');
	$('#taskedit-links').show();
	}
	else {
	$('#taskedit-links').hide();
	}

	// set recurrence
	me.set_recurrence_edit(rec);

	// init attendees tab
	var organizer = !rec.attendees \|\| is_organizer(rec),
	allow_invitations = organizer \|\| (rec.owner && rec.owner == 'anonymous') \|\| settings.invite_shared;

	task_attendees = [];
	attendees_list = $('#edit-attendees-table > tbody').html('');
	$('#edit-attendees-notify')[(allow_invitations && has_attendees(rec) && (settings.itip_notify & 2) ? 'show' : 'hide')]();
	$('#edit-localchanges-warning')[(has_attendees(rec) && !(allow_invitations \|\| (rec.owner && is_organizer(rec, rec.owner))) ? 'show' : 'hide')]();

	// attendees (aka assignees)
	if (list.attendees) {
	var j, data, reply_selected = 0;
	if (rec.attendees) {
	for (j=0; j < rec.attendees.length; j++) {
	data = rec.attendees[j];
	add_attendee(data, !allow_invitations);
	if (allow_invitations && !data.noreply) {
	reply_selected++;
	}
	}
	}

	// make sure comment box is visible if at least one attendee has reply enabled
	// or global "send invitations" checkbox is checked
	$('#taskeditform .attendees-commentbox')[(reply_selected \|\| invite.checked ? 'show' : 'hide')]();

	// select the correct organizer identity
	var identity_id = 0;
	$.each(settings.identities, function(i,v) {
	if (!rec.organizer \|\| v == rec.organizer.email) {
	identity_id = i;
	return false;
	}
	});

	$('#edit-tab-attendees').show();
	$('#edit-attendees-form')[(allow_invitations?'show':'hide')]();
	$('#edit-identities-list').val(identity_id);
	$('#taskedit-organizer')[(organizer ? 'show' : 'hide')]();
	}
	else {
	$('#edit-tab-attendees').hide();
	}

	// attachments
	rcmail.enable_command('remove-attachment', list.editable);
	me.selected_task.deleted_attachments = [];
	// we're sharing some code for uploads handling with app.js
	rcmail.env.attachments = [];
	rcmail.env.compose_id = me.selected_task.id; // for rcmail.async_upload_form()

	if ($.isArray(rec.attachments)) {
	task_show_attachments(rec.attachments, $('#taskedit-attachments'), rec, true);
	}
	else {
	$('#taskedit-attachments > ul').empty();
	}

	// show/hide tabs according to calendar's feature support
	$('#taskedit-tab-attachments')[(list.attachments\|\|rec.attachments?'show':'hide')]();

	// activate the first tab
	$('#taskedit').tabs('option', 'active', 0);

	// define dialog buttons
	var buttons = [];
	buttons.push({
	text: rcmail.gettext('save', 'tasklist'),
	'class': 'mainaction',
	click: function() {
	var data = me.selected_task;
	data._status_before = me.selected_task.status + '';

	// copy form field contents into task object to save
	$.each({ title:title, description:description, date:recdate, time:rectime, startdate:recstartdate, starttime:recstarttime, status:taskstatus }, function(key,input){
	data[key] = input.val();
	});
	data.list = tasklist.find('option:selected').val();
	data.tags = [];
	data.attachments = [];
	data.attendees = task_attendees;
	data.valarms = me.serialize_alarms('#taskedit-alarms');
	data.recurrence = me.serialize_recurrence(rectime.val());

	// do some basic input validation
	if (!data.title \|\| !data.title.length) {
	title.focus();
	return false;
	}
	else if (data.startdate && data.date) {
	var startdate = $.datepicker.parseDate(datepicker_settings.dateFormat, data.startdate, datepicker_settings);
	var duedate = $.datepicker.parseDate(datepicker_settings.dateFormat, data.date, datepicker_settings);
	if (startdate > duedate) {
	alert(rcmail.gettext('invalidstartduedates', 'tasklist'));
	return false;
	}
	else if ((data.time == '') != (data.starttime == '')) {
	alert(rcmail.gettext('invalidstartduetimes', 'tasklist'));
	return false;
	}
	}
	else if (data.recurrence && !data.startdate && !data.date) {
	alert(rcmail.gettext('recurrencerequiresdate', 'tasklist'));
	return false;
	}

	// collect tags
	$('input[type="hidden"]', rcmail.gui_objects.edittagline).each(function(i,elem) {
	if (elem.value)
	data.tags.push(elem.value);
	});
	// including the "pending" one in the text box
	var newtag = $('#tagedit-input').val();
	if (newtag != '') {
	data.tags.push(newtag);
	}

	// uploaded attachments list
	for (var i in rcmail.env.attachments) {
	if (i.match(/^rcmfile(.+)/))
	data.attachments.push(RegExp.$1);
	}

	// task assigned to a new list
	if (data.list && listdata[id] && data.list != listdata[id].list) {
	data._fromlist = list.id;
	}

	data.complete = complete.val() / 100;
	if (isNaN(data.complete))
	data.complete = null;
	else if (data.complete == 1.0 && rec.status === '')
	data.status = 'COMPLETED';

	if (!data.list && list.id)
	data.list = list.id;

	if (!data.tags.length)
	data.tags = '';

	if (organizer) {
	data._identity = $('#edit-identities-list option:selected').val();
	delete data.organizer;
	}

	// per-attendee notification suppression
	var need_invitation = false;
	if (allow_invitations) {
	$.each(data.attendees, function (i, v) {
	if (v.role != 'ORGANIZER') {
	if ($('input.edit-attendee-reply[value="' + v.email + '"]').prop('checked')) {
	need_invitation = true;
	delete data.attendees[i]['noreply'];
	}
	else if (settings.itip_notify > 0) {
	data.attendees[i].noreply = 1;
	}
	}
	});
	}

	// tell server to send notifications
	if ((has_attendees(data) \|\| (rec.id && has_attendees(rec))) && allow_invitations && (notify.checked \|\| invite.checked \|\| need_invitation)) {
	data._notify = settings.itip_notify;
	data._comment = comment.val();
	}
	else if (data._notify) {
	delete data._notify;
	}

	if (save_task(data, action))
	$dialog.dialog('close');
	} // end click:
	});

	if (action != 'new') {
	buttons.push({
	text: rcmail.gettext('delete', 'tasklist'),
	'class': 'delete',
	click: function() {
	if (delete_task(rec.id))
	$dialog.dialog('close');
	}
	});
	}

	buttons.push({
	text: rcmail.gettext('cancel', 'tasklist'),
	click: function() {
	$dialog.dialog('close');
	}
	});

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: (!bw.ie6 && !bw.ie7), // disable for performance reasons
	closeOnEscape: false,
	title: rcmail.gettext((action == 'edit' ? 'edittask' : 'newtask'), 'tasklist'),
	close: function() {
	rcmail.ksearch_blur();
	editform.hide().appendTo(document.body);
	$dialog.dialog('destroy').remove();
	},
	buttons: buttons,
	minHeight: 460,
	minWidth: 500,
	width: 580
	}).append(editform.show()); // adding form content AFTERWARDS massively speeds up opening on IE

	title.select();

	// set dialog size according to content
	me.dialog_resize($dialog.get(0), $dialog.height(), 580);
	}

	/**
	* Open a task attachment either in a browser window for inline view or download it
	*/
	function load_attachment(rec, att)
	{
	// can't open temp attachments
	if (!rec.id \|\| rec.id < 0)
	return false;

	var query = { _id: att.id, _t: rec.recurrence_id\|\|rec.id, _list:rec.list, _frame: 1 };
	if (rec.rev)
	query._rev = rec.rev;


	// open attachment in frame if it's of a supported mimetype
	// similar as in app.js and calendar_ui.js
	if (att.id && att.mimetype && $.inArray(att.mimetype, settings.mimetypes)>=0) {
	if (rcmail.open_window(rcmail.url('get-attachment', query), true, true)) {
	return;
	}
	}

	query._frame = null;
	query._download = 1;
	rcmail.goto_url('get-attachment', query, false);
	};

	/**
	* Build task attachments list
	*/
	function task_show_attachments(list, container, rec, edit)
	{
	var i, id, len, content, li, elem,
	ul = $('<ul>').addClass('attachmentslist');

	for (i=0, len=list.length; i<len; i++) {
	elem = list[i];
	li = $('<li>').addClass(elem.classname);

	if (edit) {
	rcmail.env.attachments[elem.id] = elem;
	// delete icon
	content = $('<a>')
	.attr('href', '#delete')
	.attr('title', rcmail.gettext('delete'))
	.addClass('delete')
	.click({ id:elem.id }, function(e) {
	remove_attachment(this, e.data.id);
	return false;
	});

	if (!rcmail.env.deleteicon) {
	content.html(rcmail.gettext('delete'));
	}
	else {
	$('<img>').attr('src', rcmail.env.deleteicon).attr('alt', rcmail.gettext('delete')).appendTo(content);
	}

	li.append(content);
	}

	// name/link
	$('<a>')
	.attr('href', '#load')
	.addClass('file')
	.html(elem.name).click({ task:rec, att:elem }, function(e) {
	load_attachment(e.data.task, e.data.att);
	return false;
	}).appendTo(li);

	ul.append(li);
	}

	if (edit && rcmail.gui_objects.attachmentlist) {
	ul.id = rcmail.gui_objects.attachmentlist.id;
	rcmail.gui_objects.attachmentlist = ul.get(0);
	}

	container.empty().append(ul);
	};

	/**
	*
	*/
	function remove_attachment(elem, id)
	{
	$(elem.parentNode).hide();
	me.selected_task.deleted_attachments.push(id);
	delete rcmail.env.attachments[id];
	}

	/**
	*
	*/
	function remove_link(elem)
	{
	var $elem = $(elem), uri = $elem.attr('data-uri');

	// remove the link item matching the given uri
	me.selected_task.links = $.grep(me.selected_task.links, function(link) { return link.uri != uri; });

	// remove UI list item
	$elem.hide().closest('li').addClass('deleted');
	}

	/**
	*
	*/
	function add_childtask(id)
	{
	if (rcmail.busy)
	return false;

	var rec = listdata[id];
	task_edit_dialog(null, 'new', { parent_id:id, list:rec.list });
	}

	/**
	* Delete the given task
	*/
	function delete_task(id)
	{
	var rec = listdata[id];
	if (!rec \|\| rec.readonly \|\| rcmail.busy)
	return false;

	var html, buttons = [], $dialog = $('<div>');

	// Subfunction to submit the delete command after confirm
	var _delete_task = function(id, mode) {
	var rec = listdata[id],
	li = $('li[rel="'+id+'"]', rcmail.gui_objects.resultlist).hide(),
	decline = $dialog.find('input.confirm-attendees-decline:checked').length,
	notify = $dialog.find('input.confirm-attendees-notify:checked').length;

	saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
	rcmail.http_post('task', { action:'delete', t:{ id:rec.id, list:rec.list, _decline:decline, _notify:notify }, mode:mode, filter:filtermask });

	// move childs to parent/root
	if (mode != 1 && rec.children !== undefined) {
	var parent_node = rec.parent_id ? $('li[rel="'+rec.parent_id+'"] > .childtasks', rcmail.gui_objects.resultlist) : null;
	if (!parent_node \|\| !parent_node.length)
	parent_node = rcmail.gui_objects.resultlist;

	$.each(rec.children, function(i,cid) {
	var child = listdata[cid];
	child.parent_id = rec.parent_id;
	resort_task(child, $('li[rel="'+cid+'"]').appendTo(parent_node), true);
	});
	}

	li.remove();
	delete listdata[id];
	}

	if (rec.children && rec.children.length) {
	html = rcmail.gettext('deleteparenttasktconfirm','tasklist');
	buttons.push({
	text: rcmail.gettext('deletethisonly','tasklist'),
	click: function() {
	_delete_task(id, 0);
	$(this).dialog('close');
	}
	});
	buttons.push({
	text: rcmail.gettext('deletewithchilds','tasklist'),
	click: function() {
	_delete_task(id, 1);
	$(this).dialog('close');
	}
	});
	}
	else {
	html = rcmail.gettext('deletetasktconfirm','tasklist');
	buttons.push({
	text: rcmail.gettext('delete','tasklist'),
	'class': 'delete',
	click: function() {
	_delete_task(id, 0);
	$(this).dialog('close');
	}
	});
	}

	if (is_attendee(rec)) {
	html += '<div class="task-dialog-message">' +
	'<label><input class="confirm-attendees-decline" type="checkbox" checked="checked" value="1" name="_decline" /> ' +
	rcmail.gettext('itipdeclinetask', 'tasklist') +
	'</label></div>';
	}
	else if (has_attendees(rec) && is_organizer(rec)) {
	html += '<div class="task-dialog-message">' +
	'<label><input class="confirm-attendees-notify" type="checkbox" checked="checked" value="1" name="_notify" /> ' +
	rcmail.gettext('sendcancellation', 'tasklist') +
	'</label></div>';
	}

	buttons.push({
	text: rcmail.gettext('cancel', 'tasklist'),
	click: function() {
	$(this).dialog('close');
	}
	});

	$dialog.html(html);
	$dialog.dialog({
	modal: true,
	width: 520,
	dialogClass: 'warning no-close',
	title: rcmail.gettext('deletetask', 'tasklist'),
	buttons: buttons,
	close: function(){
	$dialog.dialog('destroy').hide();
	}
	}).addClass('tasklist-confirm').show();

	return true;
	}

	/**
	* Check if the given task matches the current filtermask and tag selection
	*/
	function match_filter(rec, cache, recursive)
	{
	if (!rec)
	return false;

	// return cached result
	if (typeof cache[rec.id] != 'undefined' && recursive != 2) {
	return cache[rec.id];
	}

	var match = !filtermask \|\| (filtermask & rec.mask) == filtermask;

	// in focusview mode, only tasks from the selected list are allowed
	if (focusview)
	match = $.inArray(rec.list, focusview_lists) >= 0 && match;

	if (match && tagsfilter.length) {
	match = rec.tags && rec.tags.length;
	var alltags = get_inherited_tags(rec).concat(rec.tags \|\| []);
	for (var i=0; match && i < tagsfilter.length; i++) {
	if ($.inArray(tagsfilter[i], alltags) < 0)
	match = false;
	}
	}

	// check if a child task matches the tags
	if (!match && (recursive\|\|0) < 2 && rec.children && rec.children.length) {
	for (var j=0; !match && j < rec.children.length; j++) {
	match = match_filter(listdata[rec.children[j]], cache, 1);
	}
	}

	// walk up the task tree and check if a parent task matches
	var parent_id;
	if (!match && !recursive && (parent_id = rec.parent_id)) {
	while (!match && parent_id && listdata[parent_id]) {
	match = match_filter(listdata[parent_id], cache, 2);
	parent_id = listdata[parent_id].parent_id;
	}
	}

	if (recursive != 1) {
	cache[rec.id] = match;
	}

	return match;
	}

	/**
	*
	*/
	function get_inherited_tags(rec)
	{
	var parent_id, itags = [];

	if ((parent_id = rec.parent_id)) {
	while (parent_id && listdata[parent_id]) {
	itags = itags.concat(listdata[parent_id].tags \|\| []);
	parent_id = listdata[parent_id].parent_id;
	}
	}

	return $.uniqueStrings(itags);
	}

	/**
	* Change tasks list sorting
	*/
	function list_set_sort(col)
	{
	if (settings.sort_col != col) {
	settings.sort_col = col;
	$('#taskviewsortmenu .sortcol').attr('aria-checked', 'false').removeClass('selected')
	.filter('.by-' + col).attr('aria-checked', 'true').addClass('selected');

	// re-sort list index and re-render list
	listindex.sort(function(a, b) { return task_cmp(listdata[a], listdata[b]); });
	render_tasklist();

	rcmail.enable_command('list-order', settings.sort_col != 'auto');
	$('#taskviewsortmenu .sortorder').removeClass('selected').filter('[aria-checked=true]').addClass('selected');

	rcmail.save_pref({ name: 'tasklist_sort_col', value: (col == 'auto' ? '' : col) });
	}
	}

	/**
	* Change tasks list sort order
	*/
	function list_set_order(order)
	{
	if (settings.sort_order != order) {
	settings.sort_order = order;
	$('#taskviewsortmenu .sortorder').attr('aria-checked', 'false').removeClass('selected')
	.filter('.' + order).attr('aria-checked', 'true').addClass('selected');

	// re-sort list index and re-render list
	listindex.sort(function(a, b) { return task_cmp(listdata[a], listdata[b]); });
	render_tasklist();

	rcmail.save_pref({ name: 'tasklist_sort_order', value: order });
	}
	}

	/**
	*
	*/
	function list_edit_dialog(id)
	{
	var list = me.tasklists[id],
	$dialog = $(rcmail.gui_containers.tasklistform);

	if ($dialog.is(':ui-dialog'))
	$dialog.dialog('close');

	if (!list)
	list = { name:'', editable:true, rights:'riwta', showalarms:true };

	var editform, name, alarms;

	$dialog.html(rcmail.get_label('loading'));
	$.ajax({
	type: 'GET',
	dataType: 'html',
	url: rcmail.url('tasklist'),
	data: { action:(list.id ? 'form-edit' : 'form-new'), l:{ id:list.id } },
	success: function(data) {
	$dialog.html(data);
	rcmail.triggerEvent('tasklist_editform_load', list);

	// resize and reposition dialog window
	editform = $('#tasklisteditform');
	me.dialog_resize(rcmail.gui_containers.tasklistform, editform.height(), editform.width());

	name = $('#taskedit-tasklistame').prop('disabled', !has_permission(list, 'a')\|\|list.norename).val(list.editname \|\| list.name);
	alarms = $('#taskedit-showalarms').prop('checked', list.showalarms).get(0);
	name.select();

	// suppress form submission with <Enter>
	editform.on('submit', function(e) {
	e.preventDefault();
	return false;
	});
	}
	});

	// dialog buttons
	var buttons = [];

	buttons.push({
	text: rcmail.gettext('save','tasklist'),
	'class': 'mainaction',
	click: function() {
	// do some input validation
	if (!name.val() \|\| name.val().length < 2) {
	alert(rcmail.gettext('invalidlistproperties', 'tasklist'));
	name.select();
	return;
	}

	// post data to server
	var data = editform.serializeJSON();
	if (list.id)
	data.id = list.id;
	if (alarms)
	data.showalarms = alarms.checked ? 1 : 0;

	saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
	rcmail.http_post('tasklist', { action:(list.id ? 'edit' : 'new'), l:data });
	$dialog.dialog('close');
	} // end click:
	});

	buttons.push({
	text: rcmail.gettext('cancel','tasklist'),
	click: function() {
	$dialog.dialog('close');
	}
	});

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: true,
	closeOnEscape: false,
	title: rcmail.gettext((list.id ? 'editlist' : 'createlist'), 'tasklist'),
	close: function() {
	$dialog.dialog('destroy').hide();
	},
	buttons: buttons,
	minWidth: 400,
	width: 420
	}).show();
	}

	/**
	*
	*/
	function list_delete(id)
	{
	var list = me.tasklists[id];
	if (list && !list.norename && confirm(rcmail.gettext(list.children ? 'deletelistconfirmrecursive' : 'deletelistconfirm', 'tasklist'))) {
	saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
	rcmail.http_post('tasklist', { action:'delete', l:{ id:list.id } });
	return true;
	}
	return false;
	}

	/**
	*
	*/
	function list_remove(id)
	{
	var list = me.tasklists[id];
	if (list && list.removable) {
	destroy_list(list);
	rcmail.http_post('tasklist', { action:'subscribe', l:{ id:list.id, active:0, permanent:0, recursive:1 } });
	}
	}

	/**
	* Callback from server to finally remove the given list
	*/
	function destroy_list(prop)
	{
	var li, delete_ids = [],
	list = me.tasklists[prop.id];

	// find sub-lists
	if (list && list.children) {
	for (var child_id in me.tasklists) {
	if (String(child_id).indexOf(prop.id) == 0)
	delete_ids.push(child_id);
	}
	}
	else {
	delete_ids.push(prop.id);
	}

	// delete all subfolders in the list
	for (var i=0; i < delete_ids.length; i++) {
	id = delete_ids[i];
	list = me.tasklists[id];
	tasklists_widget.remove(id);

	if (list) {
	list.active = false;
	// delete me.tasklists[prop.id];
	unlock_saving();
	remove_tasks(list.id);
	}
	$("#taskedit-tasklist option[value='"+id+"']").remove();
	}
	}

	/**
	*
	*/
	function insert_list(prop)
	{
	if (prop._reload) {
	rcmail.redirect(rcmail.url(''));
	return;
	}

	tasklists_widget.insert({
	id: prop.id,
	classes: [ prop.group \|\| '' ],
	virtual: prop.virtual,
	html: prop.html
	}, prop.parent \|\| null, prop.group);

	// flag as tasklist for drag & drop
	$(tasklists_widget.get_item(prop.id)).data('type', 'tasklist');

	delete prop.html;
	me.tasklists[prop.id] = prop;

	// append to list selector in task edit dialog, too (#2985)
	$('<option>').attr('value', prop.id).html(Q(prop.name)).appendTo('#taskedit-tasklist');
	}

	/**
	*
	*/
	function update_list(prop)
	{
	var id = prop.oldid \|\| prop.id,
	li = tasklists_widget.get_item(id);

	if (prop._reload) {
	rcmail.redirect(rcmail.url(''));
	return;
	}

	if (me.tasklists[id] && li) {
	delete me.tasklists[id];
	me.tasklists[prop.id] = prop;
	$(li).find('input').first().val(prop.id);
	$(li).find('.listname').first().html(Q(prop.name));
	tasklists_widget.update(id, { id:prop.id, html:li.children().first() });
	}
	}

	/**
	*
	*/
	function list_showurl(id)
	{
	var list = me.tasklists[id];
	if (list && list.caldavurl) {
	$('div.showurldialog:ui-dialog').dialog('close');

	var $dialog = $('<div>').addClass('showurldialog').append('<p>'+rcmail.gettext('caldavurldescription', 'tasklist')+'</p>'),
	textbox = $('<textarea>').addClass('urlbox').css('width', '100%').attr('rows', 2).appendTo($dialog);

	$dialog.dialog({
	resizable: true,
	closeOnEscape: true,
	title: rcmail.gettext('showcaldavurl', 'tasklist'),
	close: function() {
	$dialog.dialog("destroy").remove();
	},
	width: 520
	}).show();

	textbox.val(list.caldavurl).select();
	}
	}

	/**
	* Execute search
	*/
	function quicksearch()
	{
	var q;
	if (rcmail.gui_objects.qsearchbox && (q = rcmail.gui_objects.qsearchbox.value)) {
	var id = 'search-'+q;
	var resources = [];

	for (var rid in me.tasklists) {
	if (me.tasklists[rid].active) {
	resources.push(rid);
	}
	}
	id += '@'+resources.join(',');

	// ignore if query didn't change
	if (search_request == id)
	return;

	search_request = id;
	search_query = q;

	list_tasks();
	}
	else // empty search input equals reset
	this.reset_search();
	}

	/**
	* Reset search and get back to normal listing
	*/
	function reset_search()
	{
	$(rcmail.gui_objects.qsearchbox).val('');

	if (search_request) {
	search_request = search_query = null;
	list_tasks();
	}
	}


	// method to show the print dialog.
	function print_tasks()
	{
	var param = {}, active = active_lists();

	if (active.length) {
	param = {filter: filtermask, lists: active.join(','), q: search_query};
	rcmail.open_window(rcmail.url('print', param), true, true);
	}
	};


	/** Utility functions **/

	// same as str.split(delimiter) but it ignores delimiters within quoted strings
	var explode_quoted_string = function(str, delimiter)
	{
	var result = [],
	strlen = str.length,
	q, p, i, chr, last;

	for (q = p = i = 0; i < strlen; i++) {
	chr = str.charAt(i);
	if (chr == '"' && last != '\\') {
	q = !q;
	}
	else if (!q && chr == delimiter) {
	result.push(str.substring(p, i));
	p = i + 1;
	}
	last = chr;
	}

	result.push(str.substr(p));
	return result;
	};

	/**
	* Clear any text selection
	* (text is probably selected when double-clicking somewhere)
	*/
	function clearSelection()
	{
	if (document.selection && document.selection.empty) {
	document.selection.empty() ;
	}
	else if (window.getSelection) {
	var sel = window.getSelection();
	if (sel && sel.removeAllRanges)
	sel.removeAllRanges();
	}
	}

	/**
	* Check whether the event target is a descentand of the given element
	*/
	function target_overlaps(target, elem)
	{
	while (target.parentNode) {
	if (target.parentNode == elem)
	return true;
	target = target.parentNode;
	}
	return false;
	}

	/**
	*
	*/
	function active_lists()
	{
	var active = [];
	for (var id in me.tasklists) {
	if (me.tasklists[id].active)
	active.push(id);
	}
	return active;
	}

	// resize and reposition (center) the dialog window
	this.dialog_resize = function(id, height, width)
	{
	var win = $(window), w = win.width(), h = win.height();
	$(id).dialog('option', { height: Math.min(h-20, height+130), width: Math.min(w-20, width+50) });
	};

	/**
	* Enable/disable focusview mode for the given list
	*/
	function set_focusview(id, shift)
	{
	var in_focus = $.inArray(id, focusview_lists) >= 0,
	li = $(tasklists_widget.get_item(id)).find('.tasklist').first();

	// remove list from focusview
	if (in_focus && shift && id !== null) {
	focusview_lists = $.grep(focusview_lists, function(list_id) { return list_id != id; });
	}
	else {
	if (!shift \|\| id === null) {
	focusview_lists = [];

	// uncheck all active focusview icons
	tasklists_widget.container.find('div.focusview')
	.removeClass('focusview')
	.find('a.quickview').attr('aria-checked', 'false');
	}

	if (!in_focus && id !== null) {
	focusview_lists.push(id)
	}
	}

	focusview = focusview_lists.length > 0;

	// activate list if necessary
	if (focusview && !me.tasklists[id].active) {
	li.find('input[type=checkbox]').get(0).checked = true;
	me.tasklists[id].active = true;
	fetch_counts();
	}

	// update list
	list_tasks(null);

	if (focusview) {
	li[in_focus ? 'removeClass' : 'addClass']('focusview')
	.find('a.quickview').attr('aria-checked', in_focus ? 'false' : 'true');
	$('body').addClass('quickview-active');
	}
	else {
	$('body').removeClass('quickview-active');
	}
	}


	// init dialog by default
	init_taskedit();
	}


	// extend jQuery
	// from http://james.padolsey.com/javascript/sorting-elements-with-jquery/
	jQuery.fn.sortElements = (function(){
	var sort = [].sort;

	return function(comparator, getSortable) {
	getSortable = getSortable \|\| function(){ return this };

	var last = null;
	return sort.call(this, comparator).each(function(i){
	// at this point the array is sorted, so we can just detach each one from wherever it is, and add it after the last
	var node = $(getSortable.call(this));
	var parent = node.parent();
	if (last) last.after(node);
	else parent.prepend(node);
	last = node;
	});
	};
	})();

	// equivalent to $.unique() but working on arrays of strings
	jQuery.uniqueStrings = (function() {
	return function(arr) {
	var hash = {}, out = [];

	for (var i = 0; i < arr.length; i++) {
	hash[arr[i]] = 0;
	}
	for (var val in hash) {
	out.push(val);
	}

	return out;
	};
	})();


	/* tasklist plugin UI initialization */
	var rctasks;
	window.rcmail && rcmail.addEventListener('init', function(evt) {

	rctasks = new rcube_tasklist_ui($.extend(rcmail.env.tasklist_settings, rcmail.env.libcal_settings));

	// register button commands
	rcmail.register_command('newtask', function(){ rctasks.edit_task(null, 'new', {}); }, true);
	rcmail.register_command('print', function(){ rctasks.print_tasks(); }, true);

	rcmail.register_command('list-create', function(){ rctasks.list_edit_dialog(null); }, true);
	rcmail.register_command('list-edit', function(){ rctasks.list_edit_dialog(rctasks.selected_list); }, false);
	rcmail.register_command('list-delete', function(){ rctasks.list_delete(rctasks.selected_list); }, false);
	rcmail.register_command('list-remove', function(){ rctasks.list_remove(rctasks.selected_list); }, false);
	rcmail.register_command('list-showurl', function(){ rctasks.list_showurl(rctasks.selected_list); }, false);

	rcmail.register_command('export', function(){ rctasks.export_tasks(); }, true);
	rcmail.register_command('search', function(){ rctasks.quicksearch(); }, true);
	rcmail.register_command('reset-search', function(){ rctasks.reset_search(); }, true);
	rcmail.register_command('expand-all', function(){ rctasks.expand_collapse(true); }, true);
	rcmail.register_command('collapse-all', function(){ rctasks.expand_collapse(false); }, true);

	rctasks.init();
	});

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