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	diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
	index 86cfed88..ec3f418a 100644
	--- a/plugins/calendar/calendar_ui.js
	+++ b/plugins/calendar/calendar_ui.js
	@@ -1,2276 +1,2286 @@
	/*
	+-------------------------------------------------------------------------+
	\| Javascript for the Calendar Plugin \|
	\| Version 0.3 beta \|
	\| \|
	\| This program is free software; you can redistribute it and/or modify \|
	\| it under the terms of the GNU General Public License version 2 \|
	\| as published by the Free Software Foundation. \|
	\| \|
	\| 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 General Public License for more details. \|
	\| \|
	\| You should have received a copy of the GNU General Public License along \|
	\| with this program; if not, write to the Free Software Foundation, Inc., \|
	\| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. \|
	\| \|
	+-------------------------------------------------------------------------+
	\| Author: Lazlo Westerhof <hello@lazlo.me> \|
	\| Thomas Bruederli <roundcube@gmail.com> \|
	+-------------------------------------------------------------------------+
	*/

	// 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.eventcount = [];
	this.saving_lock = null;


	/* private vars */
	var DAY_MS = 86400000;
	var me = this;
	var gmt_offset = (new Date().getTimezoneOffset() / -60) - (settings.timezone \|\| 0);
	var day_clicked = day_clicked_ts = 0;
	var ignore_click = false;
	var event_defaults = { free_busy:'busy' };
	var event_attendees = [];
	var attendees_list;
	var freebusy_ui = { workinhoursonly:false, needsupdate:false };
	var freebusy_data = {};
	var exec_deferred = bw.ie6 ? 5 : 1;
	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
	};


	/* private methods */

	var Q = this.quote_html;

	// php equivalent
	var nl2br = function(str)
	{
	return String(str).replace(/\n/g, "<br/>");
	};

	// 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;

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

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

	// from time and date strings to a real date object
	var 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 the given Date object into a unix timestamp respecting browser's and user's timezone settings
	var date2unixtime = function(date)
	{
	return Math.round(date.getTime()/1000 + gmt_offset * 3600);
	};

	var fromunixtime = function(ts)
	{
	ts -= gmt_offset * 3600;
	return new Date(ts * 1000);
	};

	// 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 > 1 \|\| event.attendees[0].email != settings.event_owner.email));
	};

	// create a nice human-readable string for the date/time range
	var event_date_text = function(event)
	{
	var fromto, duration = event.end.getTime() / 1000 - event.start.getTime() / 1000;
	if (event.allDay)
	fromto = $.fullCalendar.formatDate(event.start, settings['date_format']) + (duration > 86400 \|\| event.start.getDay() != event.end.getDay() ? ' — ' + $.fullCalendar.formatDate(event.end, settings['date_format']) : '');
	else if (duration < 86400 && event.start.getDay() == event.end.getDay())
	fromto = $.fullCalendar.formatDate(event.start, settings['date_format']) + ' ' + $.fullCalendar.formatDate(event.start, settings['time_format']) + ' — '
	+ $.fullCalendar.formatDate(event.end, settings['time_format']);
	else
	fromto = $.fullCalendar.formatDate(event.start, settings['date_format']) + ' ' + $.fullCalendar.formatDate(event.start, settings['time_format']) + ' — '
	+ $.fullCalendar.formatDate(event.end, settings['date_format']) + ' ' + $.fullCalendar.formatDate(event.end, settings['time_format']);

	return fromto;
	};

	var load_attachment = function(event, att)
	{
	var qstring = '_id='+urlencode(att.id)+'&_event='+urlencode(event.recurrence_id\|\|event.id)+'&_cal='+urlencode(event.calendar);

	// open attachment in frame if it's of a supported mimetype
	if (id && att.mimetype && $.inArray(att.mimetype, rcmail.mimetypes)>=0) {
	rcmail.attachment_win = window.open(rcmail.env.comm_path+'&_action=get-attachment&'+qstring+'&_frame=1', 'rcubeeventattachment');
	if (rcmail.attachment_win) {
	window.setTimeout(function() { rcmail.attachment_win.focus(); }, 10);
	return;
	}
	}

	rcmail.goto_url('get-attachment', qstring+'&_download=1', 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');

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

	if (edit) {
	rcmail.env.attachments[elem.id] = elem;
	// delete icon
	content = document.createElement('A');
	content.href = '#delete';
	content.title = rcmail.gettext('delete');
	$(content).click({id: elem.id}, function(e) { remove_attachment(this, e.data.id); return false; });

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

	li.appendChild(content);
	}

	// name/link
	content = document.createElement('A');
	content.innerHTML = list[i].name;
	content.href = '#load';
	$(content).click({event: event, att: elem}, function(e) {
	load_attachment(e.data.event, e.data.att); return false; });
	li.appendChild(content);

	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)
	{
	var $dialog = $("#eventshow");
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:false };

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

	if (event.location)
	$('#event-location').html('@ ' + Q(event.location)).show();
	if (event.description)
	$('#event-description').show().children('.event-text').html(nl2br(Q(event.description))); // TODO: format HTML with clickable links and stuff

	// render from-to in a nice human-readable way
	$('#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.alarms && 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)).removeClass().addClass('event-text').addClass('cal-'+calendar.id);
	if (event.categories)
	$('#event-category').show().children('.event-text').html(Q(event.categories)).removeClass().addClass('event-text '+event.className);
	if (event.free_busy)
	$('#event-free-busy').show().children('.event-text').html(Q(rcmail.gettext(event.free_busy, 'calendar')));
	if (event.priority != 1) {
	var priolabels = { 0:rcmail.gettext('low'), 1:rcmail.gettext('normal'), 2:rcmail.gettext('high') };
	$('#event-priority').show().children('.event-text').html(Q(priolabels[event.priority]));
	}
	if (event.sensitivity != 0) {
	var sensitivitylabels = { 0:rcmail.gettext('public'), 1:rcmail.gettext('private'), 2:rcmail.gettext('confidential') };
	$('#event-sensitivity').show().children('.event-text').html(Q(sensitivitylabels[event.sensitivity]));
	}

	// 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?
	}

	// list event attendees
	if (calendar.attendees && event.attendees) {
	var data, dispname, organizer = false, html = '';
	for (var j=0; j < event.attendees.length; j++) {
	data = event.attendees[j];
	dispname = Q(data.name \|\| data.email);
	if (data.email)
	dispname = '<a href="mailto:' + data.email + '" title="' + Q(data.email) + '" class="mailtolink">' + dispname + '</a>';
	html += '<span class="attendee ' + String(data.role == 'ORGANIZER' ? 'organizer' : data.status).toLowerCase() + '">' + dispname + '</span> ';
	if (data.role == 'ORGANIZER')
	organizer = true;
	// stop listing attendees
	if (j == 7 && event.attendees.length >= 7) {
	html += ' <em>' + rcmail.gettext('andnmore', 'calendar').replace('$nr', event.attendees.length - j - 1) + '</em>';
	break;
	}
	}
	if (html && event.attendees.length > 1 \|\| !organizer) {
	$('#event-attendees').show()
	.children('.event-text')
	.html(html)
	.find('a.mailtolink').click(function(e) { rcmail.redirect(rcmail.url('mail/compose', { _to:this.href.substr(7) })); return false; });
	}
	}

	var buttons = {};
	if (calendar.editable && event.editable !== false) {
	buttons[rcmail.gettext('edit', 'calendar')] = function() {
	event_edit_dialog('edit', event);
	};
	buttons[rcmail.gettext('remove', 'calendar')] = function() {
	me.delete_event(event);
	$dialog.dialog('close');
	};
	}
	else {
	buttons[rcmail.gettext('close', 'calendar')] = function(){
	$dialog.dialog('close');
	};
	}

	// open jquery UI dialog
	$dialog.dialog({
	modal: false,
	resizable: !bw.ie6,
	closeOnEscape: !bw.ie6,
	title: null,
	close: function() {
	$dialog.dialog('destroy').hide();
	},
	buttons: buttons,
	minWidth: 320,
	width: 420
	}).show();
	/*
	// add link for "more options" drop-down
	$('<a>')
	.attr('href', '#')
	.html('More Options')
	.addClass('dropdown-link')
	.click(function(){ return false; })
	.insertBefore($dialog.parent().find('.ui-dialog-buttonset').children().first());
	*/
	};

	// bring up the event dialog (jquery-ui popup)
	var event_edit_dialog = function(action, event)
	{
	// close show dialog first
	$("#eventshow").dialog('close');

	var $dialog = $('<div>');
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:action=='new' };
	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, enable/disable fields according to editable state
	$('#eventtabs').get(0).reset();
	$('#calendar-select')[(action == 'new' ? 'show' : 'hide')]();

	// event details
	var title = $('#edit-title').val(event.title \|\| '');
	var location = $('#edit-location').val(event.location \|\| '');
	var description = $('#edit-description').html(event.description \|\| '');
	var categories = $('#edit-categories').val(event.categories);
	var calendars = $('#edit-calendar').val(event.calendar);
	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);
	notify.checked = has_attendees(event), invite.checked = true;

	if (event.allDay) {
	starttime.val("00:00").hide();
	endtime.val("23:59").hide();
	allday.checked = true;
	}
	else {
	allday.checked = false;
	}

	// set alarm(s)
	// TODO: support multiple alarm entries
	if (event.alarms) {
	if (typeof event.alarms == 'string')
	event.alarms = event.alarms.split(';');

	for (var alarm, i=0; i < event.alarms.length; i++) {
	alarm = String(event.alarms[i]).split(':');
	if (!alarm[1] && alarm[0]) alarm[1] = 'DISPLAY';
	$('select.edit-alarm-type').val(alarm[1]);

	if (alarm[0].match(/@(\d+)/)) {
	var ondate = fromunixtime(parseInt(RegExp.$1));
	$('select.edit-alarm-offset').val('@');
	$('input.edit-alarm-date').val($.fullCalendar.formatDate(ondate, settings['date_format']));
	$('input.edit-alarm-time').val($.fullCalendar.formatDate(ondate, settings['time_format']));
	}
	else if (alarm[0].match(/([-+])(\d+)([MHD])/)) {
	$('input.edit-alarm-value').val(RegExp.$2);
	$('select.edit-alarm-offset').val(''+RegExp.$1+RegExp.$3);
	}
	}
	}
	// set correct visibility by triggering onchange handlers
	$('select.edit-alarm-type, select.edit-alarm-offset').change();

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

	// set recurrence form
	var recurrence, interval, rrtimes, rrenddate;
	var load_recurrence_tab = function()
	{
	recurrence = $('#edit-recurrence-frequency').val(event.recurrence ? event.recurrence.FREQ : '').change();
	interval = $('select.edit-recurrence-interval').val(event.recurrence ? event.recurrence.INTERVAL : 1);
	rrtimes = $('#edit-recurrence-repeat-times').val(event.recurrence ? event.recurrence.COUNT : 1);
	rrenddate = $('#edit-recurrence-enddate').val(event.recurrence && event.recurrence.UNTIL ? $.fullCalendar.formatDate(new Date(event.recurrence.UNTIL*1000), settings['date_format']) : '');
	$('input.edit-recurrence-until:checked').prop('checked', false);

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

	if (event.recurrence && event.recurrence.BYDAY && event.recurrence.FREQ == 'WEEKLY') {
	var wdays = event.recurrence.BYDAY.split(',');
	$('input.edit-recurrence-weekly-byday').val(wdays);
	}
	if (event.recurrence && event.recurrence.BYMONTHDAY) {
	$('input.edit-recurrence-monthly-bymonthday').val(String(event.recurrence.BYMONTHDAY).split(','));
	$('input.edit-recurrence-monthly-mode').val(['BYMONTHDAY']);
	}
	if (event.recurrence && event.recurrence.BYDAY && (event.recurrence.FREQ == 'MONTHLY' \|\| event.recurrence.FREQ == 'YEARLY')) {
	var byday, section = event.recurrence.FREQ.toLowerCase();
	if ((byday = String(event.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 (event.start) {
	$('#edit-recurrence-monthly-byday').val(weekdays[event.start.getDay()]);
	}
	if (event.recurrence && event.recurrence.BYMONTH) {
	$('input.edit-recurrence-yearly-bymonth').val(String(event.recurrence.BYMONTH).split(','));
	}
	else if (event.start) {
	$('input.edit-recurrence-yearly-bymonth').val([String(event.start.getMonth()+1)]);
	}
	};

	// show warning if editing a recurring event
	if (event.id && event.recurrence) {
	$('#edit-recurring-warning').show();
	$('input.edit-recurring-savemode[value="all"]').prop('checked', true);
	}
	else
	$('#edit-recurring-warning').hide();

	// init attendees tab
	event_attendees = [];
	attendees_list = $('#edit-attendees-table > tbody').html('');
	$('#edit-attendees-notify')[(notify.checked?'show':'hide')]();

	var load_attendees_tab = function()
	{
	if (event.attendees) {
	for (var j=0; j < event.attendees.length; j++)
	add_attendee(event.attendees[j], true);
	}

	$('#edit-attendee-schedule')[(calendar.freebusy?'show':'hide')]();
	};

	// attachments
	var load_attachments_tab = function()
	{
	rcmail.enable_command('remove-attachment', !calendar.readonly);
	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 = {};

	buttons[rcmail.gettext('save', 'calendar')] = function() {
	var start = parse_datetime(starttime.val(), startdate.val());
	var end = parse_datetime(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: date2unixtime(start),
	end: date2unixtime(end),
	allday: allday.checked?1:0,
	title: title.val(),
	description: description.val(),
	location: location.val(),
	categories: categories.val(),
	free_busy: freebusy.val(),
	priority: priority.val(),
	sensitivity: sensitivity.val(),
	recurrence: '',
	alarms: '',
	attendees: event_attendees,
	deleted_attachments: rcmail.env.deleted_attachments,
	attachments: []
	};

	// serialize alarm settings
	// TODO: support multiple alarm entries
	var alarm = $('select.edit-alarm-type').val();
	if (alarm) {
	var val, offset = $('select.edit-alarm-offset').val();
	if (offset == '@')
	data.alarms = '@' + date2unixtime(parse_datetime($('input.edit-alarm-time').val(), $('input.edit-alarm-date').val())) + ':' + alarm;
	else if ((val = parseInt($('input.edit-alarm-value').val())) && !isNaN(val) && val >= 0)
	data.alarms = offset[0] + val + offset[1] + ':' + alarm;
	}

	// 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();
	});

	// don't submit attendees if only myself is added as organizer
	if (data.attendees.length == 1 && data.attendees[0].role == 'ORGANIZER' && data.attendees[0].email == settings.event_owner.email)
	data.attendees = [];

	// tell server to send notifications
	if (data.attendees.length && ((event.id && notify.checked) \|\| (!event.id && invite.checked))) {
	data.notify = 1;
	}

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

	var until = $('input.edit-recurrence-until:checked').val();
	if (until == 'count')
	data.recurrence.COUNT = rrtimes.val();
	else if (until == 'until')
	data.recurrence.UNTIL = date2unixtime(parse_datetime(endtime.val(), rrenddate.val()));

	if (freq == 'WEEKLY') {
	var byday = [];
	$('input.edit-recurrence-weekly-byday:checked').each(function(){ byday.push(this.value); });
	if (byday.length)
	data.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)
	data.recurrence.BYMONTHDAY = bymonday.join(',');
	}
	else
	data.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)
	data.recurrence.BYMONTH = bymonth.join(',');
	if ((byday = $('#edit-recurrence-yearly-byday').val()))
	data.recurrence.BYDAY = $('#edit-recurrence-yearly-prefix').val() + byday;
	}
	}

	if (event.id) {
	data.id = event.id;
	if (event.recurrence)
	data.savemode = $('input.edit-recurring-savemode:checked').val();
	}
	else
	data.calendar = calendars.val();

	update_event(action, data);
	$dialog.dialog("close");
	};

	if (event.id) {
	buttons[rcmail.gettext('remove', 'calendar')] = function() {
	me.delete_event(event);
	$dialog.dialog('close');
	};
	}

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

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

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

	var editform = $("#eventedit");

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: !bw.ie6,
	closeOnEscape: false,
	title: rcmail.gettext((action == 'edit' ? 'edit_event' : 'new_event'), 'calendar'),
	close: function() {
	editform.hide().appendTo(document.body);
	$dialog.dialog("destroy").remove();
	rcmail.ksearch_blur();
	rcmail.ksearch_destroy();
	freebusy_data = {};
	},
	buttons: buttons,
	minWidth: 500,
	width: 580
	}).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), 530);

	title.select();

	// init other tabs asynchronously
	window.setTimeout(load_recurrence_tab, exec_deferred);
	if (calendar.attendees)
	window.setTimeout(load_attendees_tab, exec_deferred);
	if (calendar.attachments)
	window.setTimeout(load_attachments_tab, exec_deferred);
	};

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

	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("00:00").hide();
	freebusy_ui.endtime.val("23:59").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;
	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 = [ 'ORGANIZER', 'REQ-PARTICIPANT', 'OPT-PARTICIPANT', 'CHAIR' ];
	if ((attendee = freebusy_ui.attendees[domid])) {
	var req = attendee.role != 'OPT-PARTICIPANT';
	var j = $.inArray(attendee.role, roles);
	j = (j+1) % roles.length;
	attendee.role = roles[j];
	$(e.target).parent().removeClass().addClass('attendee '+String(attendee.role).toLowerCase());

	// update total display if required-status changed
	if (req != (roles[j] != 'OPT-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: true,
	title: rcmail.gettext('scheduletime', 'calendar'),
	close: function() {
	if (bw.ie6)
	$("#edit-attendees-table").css('visibility','visible');
	$dialog.dialog("destroy").hide();
	},
	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 - $('#attendees-freebusy-table td.times').width() + 1;
	me.dialog_resize($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);
	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),
	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) {
	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 + ' unknown"> </td>';

	t += freebusy_ui.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 (date2unixtime(freebusy_ui.start) < freebusy_data.start \|\| date2unixtime(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.draggable('disable').hide();
	}
	else {
	var table = $('#schedule-freebusy-times'),
	width = 0,
	pos = { top:table.children('thead').height(), left:0 },
	eventstart = date2unixtime(me.selected_event.start),
	eventend = date2unixtime(me.selected_event.end) - 60,
	slotstart = date2unixtime(freebusy_ui.start),
	slotsize = freebusy_ui.interval * 60,
	slotend, fraction, $cell;

	// iterate through slots to determine position and size of the overlay
	table.children('thead').find('td').each(function(i, cell){
	slotend = slotstart + slotsize - 60;
	// event starts in this slot: compute left
	if (eventstart >= slotstart && eventstart <= slotend) {
	fraction = 1 - (slotend - eventstart) / slotsize;
	pos.left = Math.round(cell.offsetLeft + cell.offsetWidth * fraction);
	}
	// event ends in this slot: compute width
	if (eventend >= slotstart && eventend <= slotend) {
	fraction = 1 - (slotend - eventend) / slotsize;
	width = Math.round(cell.offsetLeft + cell.offsetWidth * fraction) - pos.left;
	}

	slotstart = slotstart + slotsize;
	});

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

	// overlay is visible
	if (width > 0) {
	overlay.css({ width: (width-5)+'px', height:(table.children('tbody').height() - 4)+'px', left:pos.left+'px', top:pos.top+'px' }).draggable('enable').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
	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('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 1 days before event
	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:date2unixtime(start), end:date2unixtime(end), interval:interval, _remote:1 },
	success: function(data) {
	freebusy_ui.loading--;

	// find attendee
	var attendee = null;
	for (var 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 req = attendee.role != 'OPT-PARTICIPANT';
	var ts = data.start - 0;
	freebusy_data.start = ts;
	freebusy_data[data.email] = {};
	for (var i=0; i < data.slots.length; i++) {
	freebusy_data[data.email][ts] = data.slots[i];

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

	if (!freebusy_data.all[ts])
	freebusy_data.all[ts] = [0,0,0,0];
	freebusy_data.all[ts][data.slots[i]]++;

	ts += data.interval * 60;
	}
	freebusy_data.end = ts;
	freebusy_data.interval = data.interval;

	// 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 ts = date2unixtime(freebusy_ui.start);
	var fbdata = freebusy_data[email];

	if (fbdata && fbdata[ts] !== undefined && row.length) {
	row.children().each(function(i, cell){
	cell.className = cell.className.replace('unknown', fbdata[ts] ? status_classes[fbdata[ts]] : 'unknown');

	// also update total row if all data was loaded
	if (freebusy_ui.loading == 0 && freebusy_data.all[ts] && (cell = rowall.get(i))) {
	var workinghours = cell.className.indexOf('workinghours') >= 0;
	var all_status = freebusy_data.all[ts][2] ? 'busy' : 'unknown';
	req_status = freebusy_data.required[ts][2] ? 'busy' : 'free';
	for (var 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];
	}

	cell.className = (workinghours ? 'workinghours ' : 'offhours ') + req_status + ' all-' + all_status;
	}

	ts += freebusy_ui.interval * 60;
	});
	}
	};

	// write changed event date/times back to form fields
	var update_freebusy_dates = function(start, end)
	{
	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)
	{
	var event = me.selected_event,
	eventstart = date2unixtime(event.start), // calculate with unixtimes
	eventend = date2unixtime(event.end),
	duration = eventend - eventstart,
	sinterval = freebusy_data.interval * 60,
	intvlslots = 1,
	numslots = Math.ceil(duration / sinterval),
	checkdate, slotend, email, curdate;

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

	// iterate through free-busy slots and find candidates
	var candidatecount = 0, candidatestart = candidateend = success = false;
	for (var slot = dir > 0 ? freebusy_data.start : freebusy_data.end - sinterval; (dir > 0 && slot < freebusy_data.end) \|\| (dir < 0 && slot >= freebusy_data.start); slot += sinterval * dir) {
	slotend = slot + sinterval;
	if ((dir > 0 && slotend <= eventstart) \|\| (dir < 0 && slot >= eventend)) // skip
	continue;

	// respect workingours setting
	if (freebusy_ui.workinhoursonly) {
	curdate = fromunixtime(dir > 0 \|\| !candidateend ? slot : (candidateend - duration));
	if (is_weekend(curdate) \|\| (freebusy_data.interval <= 60 && !is_workinghour(curdate))) { // skip off-hours
	candidatestart = candidateend = false;
	candidatecount = 0;
	continue;
	}
	}

	if (!candidatestart)
	candidatestart = slot;

	// 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][slot] > 1) {
	candidatestart = candidateend = false;
	break;
	}
	}

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

	// set candidate end to slot end time
	candidatecount++;
	if (dir < 0 && !candidateend)
	candidateend = slotend;

	// if candidate is big enough, this is it!
	if (candidatecount == numslots) {
	if (dir > 0) {
	event.start = fromunixtime(candidatestart);
	event.end = fromunixtime(candidatestart + duration);
	}
	else {
	event.end = fromunixtime(candidateend);
	event.start = fromunixtime(candidateend - 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()));
	}
	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 ? '00:00' : $('#edit-starttime').val(), $('#edit-startdate').val());
	me.selected_event.end = parse_datetime(allday.checked ? '23:59' : $('#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)
	{
	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({ email:email, name:name, role:'REQ-PARTICIPANT', status:'NEEDS-ACTION' });
	success = true;
	}
	else {
	alert(rcmail.gettext('noemailwarning'));
	}
	}

	return success;
	};

	// add the given attendee to the list
	var add_attendee = function(data, edit)
	{
	// check for dupes...
	var exists = false;
	$.each(event_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">' + dispname + '</a>';

	// role selection
	var opts = {
	'ORGANIZER': rcmail.gettext('calendar.roleorganizer'),
	'REQ-PARTICIPANT': rcmail.gettext('calendar.rolerequired'),
	'OPT-PARTICIPANT': rcmail.gettext('calendar.roleoptional'),
	'CHAIR': rcmail.gettext('calendar.roleresource')
	};
	var select = '<select class="edit-attendee-role">';
	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="deletelink" title="' + Q(rcmail.gettext('delete')) + '">' + icon + '</a>';

	var html = '<td class="role">' + select + '</td>' +
	'<td class="name">' + dispname + '</td>' +
	'<td class="availability"><img src="./program/blank.gif" class="availabilityicon ' + avail + '" /></td>' +
	'<td class="confirmstate"><span class="' + String(data.status).toLowerCase() + '">' + Q(data.status) + '</span></td>' +
	'<td class="options">' + dellink + '</td>';

	var tr = $('<tr>')
	.addClass(String(data.role).toLowerCase())
	.html(html)
	.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(function(e) { rcmail.redirect(rcmail.url('mail/compose', { _to:this.href.substr(7) })); return false; });

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

	event_attendees.push(data);
	};

	// iterate over all attendees and update their free-busy status display
	var update_freebusy_status = function(event)
	{
	var icons = attendees_list.find('img.availabilityicon');
	for (var i=0; i < event_attendees.length; i++) {
	if (icons.get(i) && event_attendees[i].email)
	check_freebusy_status(icons.get(i), event_attendees[i].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).removeClass().addClass('availabilityicon unknown');
	return;
	}

	icon = $(icon).removeClass().addClass('availabilityicon loading');

	$.ajax({
	type: 'GET',
	dataType: 'html',
	url: rcmail.url('freebusy-status'),
	data: { email:email, start:date2unixtime(event.start), end:date2unixtime(event.end), _remote: 1 },
	success: function(status){
	icon.removeClass('loading').addClass(String(status).toLowerCase());
	},
	error: function(){
	icon.removeClass('loading').addClass('unknown');
	}
	});
	};

	// 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) });
	};

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

	// render event temporarily into the calendar
	if (data.start && data.end && action != 'remove') {
	var event = data.id ? $.extend(fc.fullCalendar('clientEvents', data.id)[0], data) : data;
	event.start = fromunixtime(data.start);
	event.end = fromunixtime(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);
	}
	};

	// 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) {
	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)
	{
	if (!data) data = event;
	var html = '';

	// event has attendees, ask whether to notify them
	if (has_attendees(event)) {
	html += '<div class="message">' +
	'<label><input class="confirm-attendees-donotify" type="checkbox" ' + (action != 'remove' ? ' checked="checked"' : '') + ' value="1" name="notify" /> ' +
	rcmail.gettext((action == 'remove' ? 'sendcancellation' : 'sendnotifications'), 'calendar') +
	'</label></div>';
	}

	// recurring event: user needs to select the savemode
	if (event.recurrence) {
	html += '<div class="message"><span class="ui-icon ui-icon-alert"></span>' +
	rcmail.gettext((action == 'remove' ? 'removerecurringeventwarning' : 'changerecurringeventwarning'), 'calendar') + '</div>' +
	'<div class="savemode">' +
	'<a href="#current" class="button">' + rcmail.gettext('currentevent', 'calendar') + '</a>' +
	'<a href="#future" class="button">' + 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);

	$dialog.find('a.button').button().click(function(e){
	data.savemode = String(this.href).replace(/.+#/, '');
	if ($dialog.find('input.confirm-attendees-donotify').get(0))
	data.notify = $dialog.find('input.confirm-attendees-donotify').get(0).checked ? 1 : 0;
	update_event(action, data);
	$dialog.dialog("destroy").hide();
	return false;
	});

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

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

	$dialog.dialog({
	modal: true,
	width: 420,
	dialogClass: 'warning',
	title: rcmail.gettext((action == 'remove' ? 'removeeventconfirm' : 'changeeventconfirm'), 'calendar'),
	buttons: buttons,
	close: function(){
	$dialog.dialog("destroy").hide();
	if (!rcmail.busy)
	fc.fullCalendar('refetchEvents');
	}
	}).addClass('event-update-confirm').show();

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

	// do update
	update_event(action, data);

	return true;
	};


	/* public methods */

	//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 printwin = window.open(rcmail.url('print', { view: view, date: date2unixtime(date), range: range, search: this.search_query }), "rc_print_calendars", "toolbar=no,location=yes,menubar=yes,resizable=yes,scrollbars=yes,width=800");
	window.setTimeout(function(){ printwin.focus() }, 50);
	};

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

	// 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 });
	};

	// 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").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 });
	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;

	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,
	title: rcmail.gettext((calendar.id ? 'editcalendar' : 'createcalendar'), 'calendar'),
	close: function() {
	$dialog.dialog("destroy").hide();
	},
	buttons: buttons,
	minWidth: 400,
	width: 420
	}).show();

	};

	this.calendar_remove = function(calendar)
	{
	if (confirm(rcmail.gettext('deletecalendarconfirm', 'calendar'))) {
	rcmail.http_post('calendar', { action:'remove', c:{ id:calendar.id } });
	return true;
	}
	return false;
	};

	this.calendar_destroy_source = function(id)
	{
	if (this.calendars[id]) {
	fc.fullCalendar('removeEventSource', this.calendars[id]);
	$(rcmail.get_folder_li(id, 'rcmlical')).remove();
	$('#edit-calendar option[value="'+id+'"]').remove();
	delete this.calendars[id];
	}
	};


	/* 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 (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='+escape(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');
	fc.fullCalendar('option', 'listRange', Math.max(60, settings['agenda_range']));
	fc.fullCalendar('changeView', 'table');

	// 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', 'smart');
	fc.fullCalendar('option', 'listRange', settings['agenda_range']);

	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('getView').start = null; // force re-render
	fc.fullCalendar('option', 'listRange', fc.fullCalendar('option', 'listRange') + 30).fullCalendar('render');
	}
	else
	fc.fullCalendar('incrementDate', 0, 1, 0);
	});
	}
	}
	};

	// 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+110), width: Math.min(w-20, width+50) })
	.dialog('option', 'position', ['center', 'center']); // only works in a separate call (!?)
	};


	/* startup code */

	// create list of event sources AKA calendars
	this.calendars = {};
	var li, cal, active, event_sources = [];
	for (var id in rcmail.env.calendars) {
	cal = rcmail.env.calendars[id];
	this.calendars[id] = $.extend({
	url: "./?_task=calendar&_action=load_events&source="+escape(id),
	editable: !cal.readonly,
	className: 'fc-event-cal-'+id,
	id: id
	}, cal);

	if ((active = ($.inArray(String(id), settings.hidden_calendars) < 0))) {
	this.calendars[id].active = true;
	event_sources.push(this.calendars[id]);
	}

	// init event handler on calendar list checkbox
	if ((li = rcmail.get_folder_li(id, 'rcmlical'))) {
	$('#'+li.id+' input').click(function(e){
	var id = $(this).data('id');
	if (me.calendars[id]) { // add or remove event source on click
	var action;
	if (this.checked) {
	action = 'addEventSource';
	me.calendars[id].active = true;
	settings.hidden_calendars = $.map(settings.hidden_calendars, function(v){ return v == id ? null : v; });
	}
	else {
	action = 'removeEventSource';
	me.calendars[id].active = false;
	settings.hidden_calendars.push(id);
	}

	// add/remove event source
	fc.fullCalendar(action, me.calendars[id]);
	rcmail.save_pref({ name:'hidden_calendars', value:settings.hidden_calendars.join(',') });
	}
	}).data('id', id).get(0).checked = active;

	$(li).click(function(e){
	var id = $(this).data('id');
	rcmail.select_folder(id, me.selected_calendar, 'rcmlical');
	rcmail.enable_command('calendar-edit', true);
	rcmail.enable_command('calendar-remove', !me.calendars[id].readonly);
	me.selected_calendar = id;
	})
	.dblclick(function(){ me.calendar_edit_dialog(me.calendars[me.selected_calendar]); })
	.data('id', id);
	}

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

	// select default calendar
	if (settings.default_calendar && this.calendars[settings.default_calendar] && !this.calendars[settings.default_calendar].readonly)
	this.selected_calendar = settings.default_calendar;


	// initalize the fullCalendar plugin
	var fc = $('#calendar').fullCalendar({
	header: {
	left: 'prev,next today',
	center: 'title',
	right: 'agendaDay,agendaWeek,month,table'
	},
	aspectRatio: 1,
	ignoreTimezone: true, // will treat the given date strings as in local (browser's) timezone
	height: $('#main').height(),
	eventSources: event_sources,
	monthNames : settings['months'],
	monthNamesShort : settings['months_short'],
	dayNames : settings['days'],
	dayNamesShort : settings['days_short'],
	firstDay : settings['first_day'],
	firstHour : settings['first_hour'],
	slotMinutes : 60/settings['timeslots'],
	timeFormat: {
	'': settings['time_format'],
	agenda: settings['time_format'] + '{ - ' + settings['time_format'] + '}',
	list: settings['time_format'] + '{ - ' + settings['time_format'] + '}',
	table: settings['time_format'] + '{ - ' + settings['time_format'] + '}'
	},
	axisFormat : settings['time_format'],
	columnFormat: {
	month: 'ddd', // Mon
	week: 'ddd ' + settings['date_short'], // Mon 9/7
	day: 'dddd ' + settings['date_short'], // Monday 9/7
	table: settings['date_agenda']
	},
	titleFormat: {
	month: 'MMMM yyyy',
	week: settings['dates_long'],
	day: 'dddd ' + settings['date_long'],
	table: settings['dates_long']
	},
	listSections: 'smart',
	listPage: 1, // advance one day in agenda view
	listRange: settings['agenda_range'],
	tableCols: ['handle', 'date', 'time', 'title', 'location'],
	defaultView: settings['default_view'],
	allDayText: rcmail.gettext('all-day', 'calendar'),
	buttonText: {
	prev: (bw.ie6 ? ' << ' : ' ◄ '),
	next: (bw.ie6 ? ' >> ' : ' ► '),
	today: settings['today'],
	day: rcmail.gettext('day', 'calendar'),
	week: rcmail.gettext('week', 'calendar'),
	month: rcmail.gettext('month', 'calendar'),
	table: rcmail.gettext('agenda', 'calendar')
	},
	selectable: true,
	selectHelper: false,
	loading: function(isLoading) {
	me.is_loading = isLoading;
	this._rc_loading = rcmail.set_busy(isLoading, 'loading', this._rc_loading);
	// trigger callback
	if (!isLoading)
	me.events_loaded($(this).fullCalendar('clientEvents').length);
	},
	// event rendering
	eventRender: function(event, element, view) {
	if (view.name != 'list' && view.name != 'table')
	element.attr('title', event.title);
	if (view.name == 'month') {
	/* attempt to limit the number of events displayed
	(could also be used to init fish-eye-view)
	var max = 4; // to be derrived from window size
	var sday = event.start.getMonth()*12 + event.start.getDate();
	var eday = event.end.getMonth()*12 + event.end.getDate();
	if (!me.eventcount[sday]) me.eventcount[sday] = 1;
	else me.eventcount[sday]++;
	if (!me.eventcount[eday]) me.eventcount[eday] = 1;
	else if (eday != sday) me.eventcount[eday]++;

	if (me.eventcount[sday] > max \|\| me.eventcount[eday] > max)
	return false;
	*/
	}
	else {
	if (event.location) {
	element.find('div.fc-event-title').after('<div class="fc-event-location">@ ' + Q(event.location) + '</div>');
	}
	if (event.recurrence)
	element.find('div.fc-event-time').append('<i class="fc-icon-recurring"></i>');
	if (event.alarms)
	element.find('div.fc-event-time').append('<i class="fc-icon-alarms"></i>');
	}
	},
	// 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 a specific event is clicked
	eventClick: function(event) {
	if (!event.temp)
	event_show_dialog(event);
	},
	// callback when an event was dragged and finally dropped
	eventDrop: function(event, dayDelta, minuteDelta, allDay, revertFunc) {
	if (event.end == null) {
	event.end = event.start;
	}
	// send move request to server
	var data = {
	id: event.id,
	calendar: event.calendar,
	start: date2unixtime(event.start),
	end: date2unixtime(event.end),
	allday: allDay?1:0
	};
	update_event_confirm('move', event, data);
	},
	// callback for event resizing
	eventResize: function(event, delta) {
	// send resize request to server
	var data = {
	id: event.id,
	calendar: event.calendar,
	start: date2unixtime(event.start),
	end: date2unixtime(event.end)
	};
	update_event_confirm('resize', event, data);
	},
	viewDisplay: function(view) {
	me.eventcount = [];
	if (!bw.ie)
	window.setTimeout(function(){ $('div.fc-content').css('overflow', view.name == 'month' ? 'auto' : 'hidden') }, 10);
	if (minical)
	window.setTimeout(function(){ minical.datepicker('setDate', fc.fullCalendar('getDate')); }, exec_deferred);
	},
	windowResize: function(view) {
	me.eventcount = [];
	}
	});


	// format time string
	var formattime = function(hour, minutes, start) {
	var time, diff, unit, duration = '', d = new Date();
	d.setHours(hour);
	d.setMinutes(minutes);
	time = $.fullCalendar.formatDate(d, settings['time_format']);
	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 autocomplete_times = function(p, callback) {
	/* Time completions */
	var result = [];
	var now = new Date();
	var st, start = (this.element.attr('id').indexOf('endtime') > 0
	&& (st = $('#edit-starttime').val())
	&& $('#edit-startdate').val() == $('#edit-enddate').val())
	? parse_datetime(st, '') : null;
	var full = p.term - 1 > 0 \|\| p.term.length > 1;
	var hours = start ? start.getHours() :
	(full ? parse_datetime(p.term, '') : now).getHours();
	var step = 15;
	var minutes = hours * 60 + (full ? 0 : now.getMinutes());
	var min = Math.ceil(minutes / step) * step % 60;
	var hour = Math.floor(Math.ceil(minutes / step) * step / 60);
	// list hours from 0:00 till now
	for (var h = start ? start.getHours() : 0; h < hours; h++)
	result.push(formattime(h, 0, start));
	// list 15min steps for the next two hours
	for (; h < hour + 2 && h < 24; h++) {
	while (min < 60) {
	result.push(formattime(h, min, start));
	min += step;
	}
	min = 0;
	}
	// list the remaining hours till 23:00
	while (h < 24)
	result.push(formattime((h++), 0, start));

	return callback(result);
	};

	var autocomplete_open = function(event, ui) {
	// scroll to current time
	var $this = $(this);
	var widget = $this.autocomplete('widget');
	var menu = $this.data('autocomplete').menu;
	var amregex = /^(.+)(a[.m]*)/i;
	var pmregex = /^(.+)(a[.m]*)/i;
	var val = $(this).val().replace(amregex, '0:$1').replace(pmregex, '1:$1');
	var li, html;
	widget.css('width', '10em');
	widget.children().each(function(){
	li = $(this);
	html = li.children().first().html().replace(/\s+$.+$$/, '').replace(amregex, '0:$1').replace(pmregex, '1:$1');
	if (html == val)
	menu.activate($.Event({ type:'keypress' }), li);
	});
	};

	// 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();
	};


	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: false, // maybe enable?
	changeYear: false, // maybe enable?
	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 = 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
	.click(function(e) {
	var cell = $(e.target);
	if (e.target.tagName == 'TD' && cell.hasClass('ui-datepicker-week-col')) {
	var base_date = minical.datepicker('getDate');
	base_date.setMonth(minical.data('month')-1);
	base_date.setYear(minical.data('year'));
	var day_off = base_date.getDay() - 1;
	if (day_off < 0) day_off = 6;
	var base_kw = $.datepicker.iso8601Week(base_date);
	var kw = parseInt(cell.html());
	var diff = (kw - base_kw) * 7 * DAY_MS;
	// select monday of the chosen calendar week
	var date = new Date(base_date.getTime() - day_off * DAY_MS + diff);
	fc.fullCalendar('gotoDate', date).fullCalendar('setDate', date).fullCalendar('changeView', 'agendaWeek');
	minical.datepicker('setDate', date);
	}
	});

	// init event dialog
	$('#eventtabs').tabs({
	show: function(event, ui) {
	if (ui.panel.id == 'event-tab-3') {
	$('#edit-attendee-name').select();
	// update free-busy status if needed
	if (freebusy_ui.needsupdate && me.selected_event)
	update_freebusy_status(me.selected_event);
	// add current user as organizer if non added yet
	if (!event_attendees.length)
	add_attendee($.extend({ role:'ORGANIZER' }, settings.event_owner));
	}
	}
	});
	$('#edit-enddate, input.edit-alarm-date').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, input.edit-alarm-time')
	.attr('autocomplete', "off")
	.autocomplete({
	delay: 100,
	minLength: 1,
	source: autocomplete_times,
	open: autocomplete_open,
	change: event_times_changed,
	select: function(event, ui) {
	$(this).val(ui.item[0]);
	return false;
	}
	})
	.click(function() { // show drop-down upon clicks
	$(this).autocomplete('search', $(this).val() ? $(this).val().replace(/\D.*/, "") : " ");
	}).each(function(){
	$(this).data('autocomplete')._renderItem = function(ul, item) {
	return $('<li>')
	.data('item.autocomplete', item)
	.append('<a>' + item[0] + item[1] + '</a>')
	.appendTo(ul);
	};
	});

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

	// toggle recurrence frequency forms
	$('#edit-recurrence-frequency').change(function(e){
	var freq = $(this).val().toLowerCase();
	$('.recurrence-form').hide();
	if (freq)
	$('#recurrence-form-'+freq+', #recurrence-form-until').show();
	});
	$('#edit-recurrence-enddate').datepicker(datepicker_settings).click(function(){ $("#edit-recurrence-repeat-until").prop('checked', true) });

	// 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){ $('#edit-attendee-add').click(); });

	$('#edit-attendee-add').click(function(){
	var input = $('#edit-attendee-name');
	rcmail.ksearch_blur();
	if (add_attendees(input.val())) {
	input.val('');
	}
	});

	// keep these two checkboxes in sync
	$('#edit-attendees-donotify, #edit-attendees-invite').click(function(){
	$('#edit-attendees-donotify, #edit-attendees-invite').prop('checked', this.checked);
	});

	$('#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-wokinghours').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');
	});

	// 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);

	// add proprietary css styles if not IE
	if (!bw.ie)
	$('div.fc-content').addClass('rcube-fc-content');
	-
	+
	+ // IE7 supresses 2nd click event when double-clicking
	+ if (bw.ie7) {
	+ $('div.fc-content').bind('dblclick', function(e){
	+ if (!$(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);

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

	// register callback commands
	rcmail.addEventListener('plugin.refresh_calendar', function(p){
	var source = cal.calendars[p.source];
	if (p.refetch && source) {
	// activate event source if new event was added to an invisible calendar
	if (!source.active) {
	source.active = true;
	$('#calendar').fullCalendar('addEventSource', source);
	$('#' + rcmail.get_folder_li(source.id, 'rcmlical').id + ' input').prop('checked', true);
	}
	else
	$('#calendar').fullCalendar('refetchEvents', source);
	}
	// remove temp events
	$('#calendar').fullCalendar('removeEvents', function(e){ return e.temp; });
	});
	rcmail.addEventListener('plugin.display_alarms', function(alarms){ cal.display_alarms(alarms); });
	rcmail.addEventListener('plugin.destroy_source', function(p){ cal.calendar_destroy_source(p.id); });
	rcmail.addEventListener('plugin.unlock_saving', function(p){ rcmail.set_busy(false, null, cal.saving_lock); });

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

	$(window).resize(function() {
	$('#calendar').fullCalendar('option', 'height', $('#main').height());
	}).resize();

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

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

	});
	diff --git a/plugins/calendar/skins/default/iehacks.css b/plugins/calendar/skins/default/iehacks.css
	index 0985f49b..54838b97 100644
	--- a/plugins/calendar/skins/default/iehacks.css
	+++ b/plugins/calendar/skins/default/iehacks.css
	@@ -1,68 +1,72 @@
	/* CSS hacks for IE 6/7 */

	#main {
	width: expression(Math.max(300, parseInt(document.documentElement.clientWidth)-10)+'px');
	height: expression(Math.max(300, parseInt(document.documentElement.clientHeight)-100)+'px');
	}

	#sidebar,
	#sidebartoggle {
	height: expression((parseInt(this.parentNode.offsetHeight)-37)+'px');
	}

	#calendar {
	width: expression((parseInt(this.parentNode.offsetWidth)-parseInt(document.getElementById('sidebartoggle').offsetWidth)-parseInt(document.getElementById('sidebartoggle').offsetLeft)-4)+'px');
	height: expression(parseInt(this.parentNode.offsetHeight)+'px');
	}

	#calendars {
	height: expression((parseInt(this.parentNode.offsetHeight)-220)+'px');
	}

	#calendartoolbar a.buttonPas {
	filter: alpha(opacity=35);
	}

	html #calendartoolbar a.button,
	html #calendartoolbar a.buttonPas {
	background-image: url(images/toolbar.gif);
	}

	#datepicker a.ui-priority-secondary {
	filter: alpha(opacity=40);
	}

	#calendarslist li span {
	background-image: url(images/calendars.gif);
	}

	#datepicker .ui-widget-header {
	width: 102%;
	}

	+.fc-day-content {
	+ cursor: default;
	+}
	+
	.fc-header-title h2 {
	font-size: 16px;
	}

	#schedule-event-time {
	filter: alpha(opacity=40);
	}

	#eventfreebusy .schedule-buttons,
	#edit-attendees-form #edit-attendee-schedule {
	right: 0.6em;
	}

	#schedule-freebusy-times td.all-busy,
	#schedule-freebusy-times td.all-tentative,
	#schedule-freebusy-times td.all-out-of-office {
	background-image: url('images/freebusy-colors.gif');
	}

	#schedule-freebusy-times tr.times td.allday {
	width: expression(Math.max(60, parseInt(this.offsetWidth))+'px');
	}

	.ui-dialog .ui-dialog-titlebar {
	width: expression((parseInt(this.parentNode.offsetWidth)-26)+'px');
	}

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