function showIcCalendar(){
			document.getElementById("intcal_mask").style.visibility = 'visible';
			// see also intcal_mask left padding
			document.getElementById("intcal_mask").style.width = document.getElementById("intcal_calendar").offsetWidth + 15 + "px";
		}
		function hideCalendar(inDate, outDate){
			if(inDate != '' && outDate != '') {
				document.getElementById("txtArrival").value = inDate;
				document.getElementById("txtDeparture").value = outDate;
				document.getElementById("txtOvernights").value = timeSpan(inDate, outDate);
			}
			document.getElementById("intcal_mask").style.visibility = 'hidden';
		}
		function timeSpan(inDate, outDate){
			var daysApart = 0;
			try
			{
				inDate = inDate.split(".");
				outDate = outDate.split(".");
				var sDate = new Date(inDate[1] + "/" + inDate[0] + "/" + inDate[2]);
				var eDate = new Date(outDate[1] + "/" + outDate[0] + "/" + outDate[2]);
				var daysApart = Math.abs(Math.round((sDate - eDate) / 86400000));
			}
			catch (err)
			{
			}
			return daysApart;
		}

		(function() {
			function IntervalCalendar(container, cfg) {
				this._iState = 0;
				cfg = cfg || {};
				cfg.multi_select = true;
				IntervalCalendar.superclass.constructor.call(this, container, cfg);
				this.beforeSelectEvent.subscribe(this._intervalOnBeforeSelect, this, true);
				this.selectEvent.subscribe(this._intervalOnSelect, this, true);
				this.beforeDeselectEvent.subscribe(this._intervalOnBeforeDeselect, this, true);
				this.deselectEvent.subscribe(this._intervalOnDeselect, this, true);
			}
			IntervalCalendar._DEFAULT_CONFIG = YAHOO.widget.CalendarGroup._DEFAULT_CONFIG;
			YAHOO.lang.extend(IntervalCalendar, YAHOO.widget.CalendarGroup, {
				_dateString: function(d) {
					var a = [];
					a[this.cfg.getProperty(IntervalCalendar._DEFAULT_CONFIG.MDY_MONTH_POSITION.key) - 1] = (d.getMonth() + 1);
					a[this.cfg.getProperty(IntervalCalendar._DEFAULT_CONFIG.MDY_DAY_POSITION.key) - 1] = d.getDate();
					a[this.cfg.getProperty(IntervalCalendar._DEFAULT_CONFIG.MDY_YEAR_POSITION.key) - 1] = d.getFullYear();
					var s = this.cfg.getProperty(IntervalCalendar._DEFAULT_CONFIG.DATE_FIELD_DELIMITER.key);
					return a.join(s);
				},
				_dateIntervalString: function(l, u) {
					var s = this.cfg.getProperty(IntervalCalendar._DEFAULT_CONFIG.DATE_RANGE_DELIMITER.key);
					return (this._dateString(l) + s + this._dateString(u));
				},
				getInterval: function() {
					// Get selected dates
					var dates = this.getSelectedDates();
					if (dates.length > 0) {
						// Return lower and upper date in array
						var l = dates[0];
						var u = dates[dates.length - 1];
						return [l, u];
					}
					else {
						// No dates selected, return empty array
						return [];
					}
				},
				setInterval: function(d1, d2) {
					// Determine lower and upper dates
					var b = (d1 <= d2);
					var l = b ? d1 : d2;
					var u = b ? d2 : d1;
					// Update configuration
					this.cfg.setProperty('selected', this._dateIntervalString(l, u), false);
					this._iState = 2;
				},
				resetInterval: function() {
					// Update configuration
					this.cfg.setProperty('selected', [], false);
					this._iState = 0;
				},
				_intervalOnBeforeSelect: function(t, a, o) {
					// Update interval state
					this._iState = (this._iState + 1) % 3;
					if (this._iState == 0) {
						// If starting over with upcoming selection, first deselect all
						this.deselectAll();
						this._iState++;
					}
				},
				_intervalOnSelect: function(t, a, o) {
					// Get selected dates
					var dates = this.getSelectedDates();
					if (dates.length > 1) {
						/* If more than one date is selected, ensure that the entire interval
						between and including them is selected */
						var l = dates[0];
						var u = dates[dates.length - 1];
						this.cfg.setProperty('selected', this._dateIntervalString(l, u), false);
					}
					// Render changes
					this.render();
				},
				_intervalOnBeforeDeselect: function(t, a, o) {
					if (this._iState != 0) {
						/* If part of an interval is already selected, then swallow up
						this event because it is superfluous (see _intervalOnDeselect) */
						return false;
					}
				},
				_intervalOnDeselect: function(t, a, o) {
					if (this._iState != 0) {
						// If part of an interval is already selected, then first deselect all
						this._iState = 0;
						this.deselectAll();

						// Get individual date deselected and page containing it
						var d = a[0];
						var date = YAHOO.widget.DateMath.getDate(d[0], d[1] - 1, d[2]);
						var page = this.getCalendarPage(date);
						if (page) {
							// Now (re)select the individual date
							page.beforeSelectEvent.fire();
							this.cfg.setProperty('selected', this._dateString(date), false);
							page.selectEvent.fire([d]);
						}
						// Swallow up since we called deselectAll above
						return false;
					}
				}
			});
			YAHOO.namespace("bernardin.calendar");
			YAHOO.bernardin.calendar.IntervalCalendar = IntervalCalendar;
		})();