function PopUpCal() {
	this._nextId = 0;
	this._inst = [];
	this._curInst = null;
	this._disabledInputs = [];
	this._popUpShowing = false;
	this._inDialog = false;
	this.regional = [];
	this.regional[''] = { 
		clearText: 'Clear', 
		closeText: 'Close', 
		prevText: '<Prev',
		nextText: 'Next>', 
		currentText: 'Today',
		dayNames: ['Su','Mo','Tu','We','Th','Fr','Sa'], 
		monthNames: ['Jeunary','February','March','April','May','June',
			'July','August','September','October','November','December'],
		dateFormat: 'DMY/'
	};
	this._defaults = { 
		autoPopUp: 'focus',
		
		defaultDate: null, 
		
		appendText: '',
		buttonText: '...',
		buttonImage: '', 
		buttonImageOnly: false, 
		closeAtTop: true, 
		
		hideIfNoPrevNext: false, 
		
		changeMonth: true,
		changeYear: true, 
		yearRange: '-10:+10',
		
		firstDay: 0,
		changeFirstDay: true,
		showOtherMonths: false,
		minDate: null,
		maxDate: null, 
		speed: 'medium', 
		customDate: null, 
		fieldSettings: null, 
		onSelect: null
	};
	$.extend(this._defaults, this.regional['']);
	this._calendarDiv = $('<div id="calendar_div"></div>');
	$(document.body).append(this._calendarDiv);
	$(document.body).mousedown(this._checkExternalClick);
}

$.extend(PopUpCal.prototype, {
	/* Class name added to elements to indicate already configured with a calendar. */
	markerClassName: 'hasCalendar',
	
	/* Register a new calendar instance - with custom settings. */
	_register: function(inst) {
		var id = this._nextId++;
		this._inst[id] = inst;
		return id;
	},

	/* Retrieve a particular calendar instance based on its ID. */
	_getInst: function(id) {
		return this._inst[id] || id;
	},


	setDefaults: function(settings) {
		extendRemove(this._defaults, settings || {});
	},

	/* Handle keystrokes. */
	_doKeyDown: function(e) {
		var inst = popUpCal._getInst(this._calId);
		if (popUpCal._popUpShowing) {
			switch (e.keyCode) {
				case 9:  popUpCal.hideCalendar(inst, '');
						break; // hide on tab out
				case 13: popUpCal._selectDate(inst);
						break; // select the value on enter
				case 27: popUpCal.hideCalendar(inst, inst._get('speed'));
						break; // hide on escape
				case 33: popUpCal._adjustDate(inst, -1, (e.ctrlKey ? 'Y' : 'M'));
						break; // previous month/year on page up/+ ctrl
				case 34: popUpCal._adjustDate(inst, +1, (e.ctrlKey ? 'Y' : 'M'));
						break; // next month/year on page down/+ ctrl
				case 35: if (e.ctrlKey) popUpCal._clearDate(inst);
						break; // clear on ctrl+end
				case 36: if (e.ctrlKey) popUpCal._gotoToday(inst);
						break; // current on ctrl+home
				case 37: if (e.ctrlKey) popUpCal._adjustDate(inst, -1, 'D');
						break; // -1 day on ctrl+left
				case 38: if (e.ctrlKey) popUpCal._adjustDate(inst, -7, 'D');
						break; // -1 week on ctrl+up
				case 39: if (e.ctrlKey) popUpCal._adjustDate(inst, +1, 'D');
						break; // +1 day on ctrl+right
				case 40: if (e.ctrlKey) popUpCal._adjustDate(inst, +7, 'D');
						break; // +1 week on ctrl+down
			}
		}
		else if (e.keyCode == 36 && e.ctrlKey) { // display the calendar on ctrl+home
			popUpCal.showFor(this);
		}
	},

	/* Filter entered characters. */
	_doKeyPress: function(e) {
		var inst = popUpCal._getInst(this._calId);
		var chr = String.fromCharCode(e.charCode == undefined ? e.keyCode : e.charCode);
		return (chr < ' ' || chr == inst._get('dateFormat').charAt(3) ||
			(chr >= '0' && chr <= '9')); // only allow numbers and separator
	},

	/* Attach the calendar to an input field. */
	_connectCalendar: function(target, inst) {
		var input = $(target);
		if (this._hasClass(input, this.markerClassName)) {
			return;
		}
		var appendText = inst._get('appendText');
		if (appendText) {
			input.after('<span class="calendar_append">' + appendText + '</span>');
		}
		var autoPopUp = inst._get('autoPopUp');
		if (autoPopUp == 'focus' || autoPopUp == 'both') { // pop-up calendar when in the marked field
			input.focus(this.showFor);
		}
		if (autoPopUp == 'button' || autoPopUp == 'both') { // pop-up calendar when button clicked
			var buttonText = inst._get('buttonText');
			var buttonImage = inst._get('buttonImage');
			var buttonImageOnly = inst._get('buttonImageOnly');
			var trigger = $(buttonImageOnly ? '<img class="calendar_trigger" src="' +
				buttonImage + '" alt="' + buttonText + '" title="' + buttonText + '"/>' :
				'<button type="button" class="calendar_trigger">' + (buttonImage != '' ?
				'<img src="' + buttonImage + '" alt="' + buttonText + '" title="' + buttonText + '"/>' :
				buttonText) + '</button>');
			input.wrap('<span class="calendar_wrap"></span>').after(trigger);
			trigger.click(this.showFor);
		}
		input.addClass(this.markerClassName).keydown(this._doKeyDown).keypress(this._doKeyPress);
		input[0]._calId = inst._id;
	},

	/* Attach an inline calendar to a div. */
	_inlineCalendar: function(target, inst) {
		var input = $(target);
		if (this._hasClass(input, this.markerClassName)) {
			return;
		}
		input.addClass(this.markerClassName).append(inst._calendarDiv);
		input[0]._calId = inst._id;
	},

	/* Does this element have a particular class? */
	_hasClass: function(element, className) {
		var classes = element.attr('class');
		return (classes && classes.indexOf(className) > -1);
	},

	/* Pop-up the calendar in a "dialog" box.
	   @param  dateText  string - the initial date to display (in the current format)
	   @param  onSelect  function - the function(dateText) to call when a date is selected
	   @param  settings  object - update the dialog calendar instance's settings (anonymous object)
	   @param  pos       int[2] - coordinates for the dialog's position within the screen
			leave empty for default (screen centre)
	   @return void */
	dialogCalendar: function(dateText, onSelect, settings, pos) {
		var inst = this._dialogInst; // internal instance
		if (!inst) {
			inst = this._dialogInst = new PopUpCalInstance({}, false);
			this._dialogInput = $('<input type="text" size="1" style="position: absolute; top: -100px;"/>');
			this._dialogInput.keydown(this._doKeyDown);
			$('body').append(this._dialogInput);
			this._dialogInput[0]._calId = inst._id;
		}
		extendRemove(inst._settings, settings || {});
		this._dialogInput.val(dateText);
		
		/*	Cross Browser Positioning */
		if (self.innerHeight) { // all except Explorer
			windowWidth = self.innerWidth;
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		} 
		this._pos = pos || // should use actual width/height below
			[(windowWidth / 2) - 100, (windowHeight / 2) - 100];

		// move input on screen for focus, but hidden behind dialog
		this._dialogInput.css('left', this._pos[0] + 'px').css('top', this._pos[1] + 'px');
		inst._settings.onSelect = onSelect;
		this._inDialog = true;
		this._calendarDiv.addClass('calendar_dialog');
		this.showFor(this._dialogInput[0]);
		if ($.blockUI) {
			$.blockUI(this._calendarDiv);
		}
	},

	/* Enable the input field(s) for entry.
	   @param  inputs  element/object - single input field or jQuery collection of input fields
	   @return void */
	enableFor: function(inputs) {
		inputs = (inputs.jquery ? inputs : $(inputs));
		inputs.each(function() {
			this.disabled = false;
			$('../button.calendar_trigger', this).each(function() { this.disabled = false; });
			$('../img.calendar_trigger', this).css({opacity:'1.0',cursor:''});
			var $this = this;
			popUpCal._disabledInputs = $.map(popUpCal._disabledInputs,
				function(value) { return (value == $this ? null : value); }); // delete entry
		});
	},

	/* Disable the input field(s) from entry.
	   @param  inputs  element/object - single input field or jQuery collection of input fields
	   @return void */
	disableFor: function(inputs) {
		inputs = (inputs.jquery ? inputs : $(inputs));
		inputs.each(function() {
			this.disabled = true;
			$('../button.calendar_trigger', this).each(function() { this.disabled = true; });
			$('../img.calendar_trigger', this).css({opacity:'0.5',cursor:'default'});
			var $this = this;
			popUpCal._disabledInputs = $.map(popUpCal._disabledInputs,
				function(value) { return (value == $this ? null : value); }); // delete entry
			popUpCal._disabledInputs[popUpCal._disabledInputs.length] = this;
		});
	},

	/* Update the settings for a calendar attached to an input field or division.
	   @param  control   element - the input field or div/span attached to the calendar or
	                     string - the ID or other jQuery selector of the input field
	   @param  settings  object - the new settings to update
	   @return void */
	reconfigureFor: function(control, settings) {
		control = (typeof control == 'string' ? $(control)[0] : control);
		var inst = this._getInst(control._calId);
		if (inst) {
			extendRemove(inst._settings, settings || {});
			this._updateCalendar(inst);
		}
	},

	/* Set the date for a calendar attached to an input field or division.
	   @param  control  element - the input field or div/span attached to the calendar
	   @param  date     Date - the new date
	   @return void */
	setDateFor: function(control, date) {
		var inst = this._getInst(control._calId);
		if (inst) {
			inst._setDate(date);
		}
	},

	/* Retrieve the date for a calendar attached to an input field or division.
	   @param  control  element - the input field or div/span attached to the calendar
	   @return Date - the current date */
	getDateFor: function(control) {
		var inst = this._getInst(control._calId);
		return (inst ? inst._getDate() : null);
	},

	/* Pop-up the calendar for a given input field.
	   @param  target  element - the input field attached to the calendar
	   @return void */
	showFor: function(target) {
		var input = (target.nodeName && target.nodeName.toLowerCase() == 'input' ? target : this);
		if (input.nodeName.toLowerCase() != 'input') { // find from button/image trigger
			input = $('input', input.parentNode)[0];
		}
		if (popUpCal._lastInput == input) { // already here
			return;
		}
		for (var i = 0; i < popUpCal._disabledInputs.length; i++) {  // check not disabled
			if (popUpCal._disabledInputs[i] == input) {
				return;
			}
		}
		var inst = popUpCal._getInst(input._calId);
		var fieldSettings = inst._get('fieldSettings');
		extendRemove(inst._settings, (fieldSettings ? fieldSettings(input) : {}));
		popUpCal.hideCalendar(inst, '');
		popUpCal._lastInput = input;
		inst._setDateFromField(input);
		if (popUpCal._inDialog) { // hide cursor
			input.value = '';
		}
		if (!popUpCal._pos) { // position below input
			popUpCal._pos = popUpCal._findPos(input);
			popUpCal._pos[1] += input.offsetHeight;
		}
		inst._calendarDiv.css('position', (popUpCal._inDialog && $.blockUI ? 'static' : 'absolute')).
			css('left', popUpCal._pos[0] + 'px').css('top', popUpCal._pos[1] + 'px');
		popUpCal._pos = null;
		popUpCal._showCalendar(inst);
	},

	/* Construct and display the calendar. */
	_showCalendar: function(id) {
		var inst = this._getInst(id);
		popUpCal._updateCalendar(inst);
		if (!inst._inline) {
			var speed = inst._get('speed');
			inst._calendarDiv.show(speed, function() {
				popUpCal._popUpShowing = true;
				popUpCal._afterShow(inst);
			});
			if (speed == '') {
				popUpCal._popUpShowing = true;
				popUpCal._afterShow(inst);
			}
			if (inst._input[0].type != 'hidden') {
				inst._input[0].focus();
			}
			this._curInst = inst;
		}
	},

	/* Generate the calendar content. */
	_updateCalendar: function(inst) {
		inst._calendarDiv.empty().append(inst._generateCalendar());
		if (inst._input && inst._input[0].type != 'hidden') {
			inst._input[0].focus();
		}
	},

	/* Tidy up after displaying the calendar. */
	_afterShow: function(inst) {
		if ($.browser.msie) { // fix IE < 7 select problems
			$('#calendar_cover').css({width: inst._calendarDiv[0].offsetWidth + 4,
				height: inst._calendarDiv[0].offsetHeight + 4});
		}
		// re-position on screen if necessary
		var calDiv = inst._calendarDiv[0];
		var pos = popUpCal._findPos(inst._input[0]);
		// Get browser width and X value (IE6+, FF, Safari, Opera)
		if( typeof( window.innerWidth ) == 'number' ) {
			browserWidth = window.innerWidth;
		} else {
			browserWidth = document.documentElement.clientWidth;
		}
		if ( document.documentElement && (document.documentElement.scrollLeft)) {
			browserX = document.documentElement.scrollLeft;	
		} else {
			browserX = document.body.scrollLeft;
		}
		// Reposition calendar if outside the browser window.
		if ((calDiv.offsetLeft + calDiv.offsetWidth) >
				(browserWidth + browserX) ) {
			inst._calendarDiv.css('left', (pos[0] + inst._input[0].offsetWidth - calDiv.offsetWidth) + 'px');
		}
		// Get browser height and Y value (IE6+, FF, Safari, Opera)
		if( typeof( window.innerHeight ) == 'number' ) {
			browserHeight = window.innerHeight;
		} else {
			browserHeight = document.documentElement.clientHeight;
		}
		if ( document.documentElement && (document.documentElement.scrollTop)) {
			browserTopY = document.documentElement.scrollTop;
		} else {
			browserTopY = document.body.scrollTop;
		}
		// Reposition calendar if outside the browser window.
		if ((calDiv.offsetTop + calDiv.offsetHeight) >
				(browserTopY + browserHeight) ) {
			inst._calendarDiv.css('top', (pos[1] - calDiv.offsetHeight) + 'px');
		}
	},

	/* Hide the calendar from view.
	   @param  id     string/object - the ID of the current calendar instance,
			or the instance itself
	   @param  speed  string - the speed at which to close the calendar
	   @return void */
	hideCalendar: function(id, speed) {
		var inst = this._getInst(id);
		if (popUpCal._popUpShowing) {
			speed = (speed != null ? speed : inst._get('speed'));
			inst._calendarDiv.hide(speed, function() {
				popUpCal._tidyDialog(inst);
			});
			if (speed == '') {
				popUpCal._tidyDialog(inst);
			}
			popUpCal._popUpShowing = false;
			popUpCal._lastInput = null;
			inst._settings.prompt = null;
			if (popUpCal._inDialog) {
				popUpCal._dialogInput.css('position', 'absolute').
					css('left', '0px').css('top', '-100px');
				if ($.blockUI) {
					$.unblockUI();
					$('body').append(this._calendarDiv);
				}
			}
			popUpCal._inDialog = false;
		}
		popUpCal._curInst = null;
	},

	/* Tidy up after a dialog display. */
	_tidyDialog: function(inst) {
		inst._calendarDiv.removeClass('calendar_dialog');
		$('.calendar_prompt', inst._calendarDiv).remove();
	},

	/* Close calendar if clicked elsewhere. */
	_checkExternalClick: function(event) {
		if (!popUpCal._curInst) {
			return;
		}
		var target = $(event.target);
		if( (target.parents("#calendar_div").length == 0)
			&& (target.attr('class') != 'calendar_trigger')
			&& popUpCal._popUpShowing 
			&& !(popUpCal._inDialog && $.blockUI) )
		{
			popUpCal.hideCalendar(popUpCal._curInst, '');
		}
	},

	/* Adjust one of the date sub-fields. */
	_adjustDate: function(id, offset, period) {
		var inst = this._getInst(id);
		inst._adjustDate(offset, period);
		this._updateCalendar(inst);
	},

	/* Action for current link. */
	_gotoToday: function(id) {
		var date = new Date();
		var inst = this._getInst(id);
		inst._selectedDay = date.getDate();
		inst._selectedMonth = date.getMonth();
		inst._selectedYear = date.getFullYear();
		this._adjustDate(inst);
	},

	/* Action for selecting a new month/year. */
	_selectMonthYear: function(id, select, period) {
		var inst = this._getInst(id);
		inst._selectingMonthYear = false;
		inst[period == 'M' ? '_selectedMonth' : '_selectedYear'] =
			select.options[select.selectedIndex].value - 0;
		this._adjustDate(inst);
	},

	/* Restore input focus after not changing month/year. */
	_clickMonthYear: function(id) {
		var inst = this._getInst(id);
		if (inst._input && inst._selectingMonthYear && !$.browser.msie) {
			inst._input[0].focus();
		}
		inst._selectingMonthYear = !inst._selectingMonthYear;
	},

	/* Action for changing the first week day. */
	_changeFirstDay: function(id, a) {
		var inst = this._getInst(id);
		var dayNames = inst._get('dayNames');
		var value = a.firstChild.nodeValue;
		for (var i = 0; i < 7; i++) {
			if (dayNames[i] == value) {
				inst._settings.firstDay = i;
				break;
			}
		}
		this._updateCalendar(inst);
	},

	/* Action for selecting a day. */
	_selectDay: function(id, td) {
		var inst = this._getInst(id);
		inst._selectedDay = $("a", td).html();
		this._selectDate(id);
	},

	/* Erase the input field and hide the calendar. */
	_clearDate: function(id) {
		this._selectDate(id, '');
	},

	/* Update the input field with the selected date. */
	_selectDate: function(id, dateStr) {
		var inst = this._getInst(id);
		dateStr = (dateStr != null ? dateStr : inst._formatDate());
		if (inst._input) {
			inst._input.val(dateStr);
		}
		var onSelect = inst._get('onSelect');
		if (onSelect) {
			onSelect(dateStr, inst);  // trigger custom callback
		}
		else {
			inst._input.trigger('change'); // fire the change event
		}
		if (inst._inline) {
			this._updateCalendar(inst);
		}
		else {
			this.hideCalendar(inst, inst._get('speed'));
		}
	},

	/* Set as customDate function to prevent selection of weekends.
	   @param  date  Date - the date to customise
	   @return [boolean, string] - is this date selectable?, what is its CSS class? */
	noWeekends: function(date) {
		var day = date.getDay();
		return [(day > 0 && day < 6), ''];
	},

	/* Find an object's position on the screen. */
	_findPos: function(obj) {
		while (obj && (obj.type == 'hidden' || obj.nodeType != 1)) {
			obj = obj.nextSibling;
		}
		var curleft = curtop = 0;
		if (obj && obj.offsetParent) {
			curleft = obj.offsetLeft;
			curtop = obj.offsetTop;
			while (obj = obj.offsetParent) {
				var origcurleft = curleft;
				curleft += obj.offsetLeft;
				if (curleft < 0) {
					curleft = origcurleft;
				}
				curtop += obj.offsetTop;
			}
		}
		return [curleft,curtop];
	}
});

/* Individualised settings for calendars applied to one or more related inputs.
   Instances are managed and manipulated through the PopUpCal manager. */
function PopUpCalInstance(settings, inline) {
	this._id = popUpCal._register(this);
	this._selectedDay = 0;
	this._selectedMonth = 0; // 0-11
	this._selectedYear = 0; // 4-digit year
	this._input = null; // The attached input field
	this._inline = inline; // True if showing inline, false if used in a popup
	this._calendarDiv = (!inline ? popUpCal._calendarDiv :
		$('<div id="calendar_div_' + this._id + '" class="calendar_inline"></div>'));
	// customise the calendar object - uses manager defaults if not overridden
	this._settings = extendRemove({}, settings || {}); // clone
	if (inline) {
		this._setDate(this._getDefaultDate());
	}
}

$.extend(PopUpCalInstance.prototype, {
	/* Get a setting value, defaulting if necessary. */
	_get: function(name) {
		return (this._settings[name] != null ? this._settings[name] : popUpCal._defaults[name]);
	},

	/* Parse existing date and initialise calendar. */
	_setDateFromField: function(input) {
		this._input = $(input);
		var dateFormat = this._get('dateFormat');
		var currentDate = this._input.val().split(dateFormat.charAt(3));
		if (currentDate.length == 3) {
			this._currentDay = parseInt(currentDate[dateFormat.indexOf('D')], 10);
			this._currentMonth = parseInt(currentDate[dateFormat.indexOf('M')], 10) - 1;
			this._currentYear = parseInt(currentDate[dateFormat.indexOf('Y')], 10);
		}
		else {
			var date = this._getDefaultDate();
			this._currentDay = date.getDate();
			this._currentMonth = date.getMonth();
			this._currentYear = date.getFullYear();
		}
		this._selectedDay = this._currentDay;
		this._selectedMonth = this._currentMonth;
		this._selectedYear = this._currentYear;
		this._adjustDate();
	},
	
	/* Retrieve the default date shown on opening. */
	_getDefaultDate: function() {
		var offsetDate = function(offset) {
			var date = new Date();
			date.setDate(date.getDate() + offset);
			return date;
		};
		var defaultDate = this._get('defaultDate');
		return (defaultDate == null ? new Date() :
			(typeof defaultDate == 'number' ? offsetDate(defaultDate) : defaultDate));
	},

	/* Set the date directly. */
	_setDate: function(date) {
		this._selectedDay = this._currentDay = date.getDate();
		this._selectedMonth = this._currentMonth = date.getMonth();
		this._selectedYear = this._currentYear = date.getFullYear();
		this._adjustDate();
	},

	/* Retrieve the date directly. */
	_getDate: function() {
		return new Date(this._currentYear, this._currentMonth, this._currentDay);
	},

	/* Generate the HTML for the current state of the calendar. */
	_generateCalendar: function() {
		var today = new Date();
		today = new Date(today.getFullYear(), today.getMonth(), today.getDate()); // clear time
		// build the calendar HTML
		var controls = '<div class="calendar_control">' +
			'<a class="calendar_clear" onclick="popUpCal._clearDate(' + this._id + ');">' +
			this._get('clearText') + '</a>' +
			'<a class="calendar_close" onclick="popUpCal.hideCalendar(' + this._id + ');">' +
			this._get('closeText') + '</a></div>';
		var prompt = this._get('prompt');
		var closeAtTop = this._get('closeAtTop');
		var hideIfNoPrevNext = this._get('hideIfNoPrevNext');
		// controls and links
		var html = (prompt ? '<div class="calendar_prompt">' + prompt + '</div>' : '') +
			(closeAtTop && !this._inline ? controls : '') + '<div class="calendar_links">' +
			(this._canAdjustMonth(-1) ? '<a class="calendar_prev" ' +
			'onclick="popUpCal._adjustDate(' + this._id + ', -1, \'M\');">' + this._get('prevText') + '</a>' :
			(hideIfNoPrevNext ? '' : '<label class="calendar_prev">' + this._get('prevText') + '</label>')) +
			(this._isInRange(today) ? '<a class="calendar_current" ' +
			'onclick="popUpCal._gotoToday(' + this._id + ');">' + this._get('currentText') + '</a>' : '') +
			(this._canAdjustMonth(+1) ? '<a class="calendar_next" ' +
			'onclick="popUpCal._adjustDate(' + this._id + ', +1, \'M\');">' + this._get('nextText') + '</a>' :
			(hideIfNoPrevNext ? '' : '<label class="calendar_next">' + this._get('nextText') + '</label>')) +
			'</div><div class="calendar_header">';
		var minDate = this._get('minDate');
		var maxDate = this._get('maxDate');
		// month selection
		var monthNames = this._get('monthNames');
		if (!this._get('changeMonth')) {
			html += monthNames[this._selectedMonth] + '&nbsp;';
		}
		else {
			var inMinYear = (minDate && minDate.getFullYear() == this._selectedYear);
			var inMaxYear = (maxDate && maxDate.getFullYear() == this._selectedYear);
			html += '<select class="calendar_newMonth" ' +
				'onchange="popUpCal._selectMonthYear(' + this._id + ', this, \'M\');" ' +
				'onclick="popUpCal._clickMonthYear(' + this._id + ');">';
			for (var month = 0; month < 12; month++) {
				if ((!inMinYear || month >= minDate.getMonth()) &&
						(!inMaxYear || month <= maxDate.getMonth())) {
					html += '<option value="' + month + '"' +
						(month == this._selectedMonth ? ' selected="selected"' : '') +
						'>' + monthNames[month] + '</option>';
				}
			}
			html += '</select>';
		}
		// year selection
		if (!this._get('changeYear')) {
			html += this._selectedYear;
		}
		else {
			// determine range of years to display
			var years = this._get('yearRange').split(':');
			var year = 0;
			var endYear = 0;
			if (years.length != 2) {
				year = this._selectedYear - 10;
				endYear = this._selectedYear + 10;
			}
			else if (years[0].charAt(0) == '+' || years[0].charAt(0) == '-') {
				year = this._selectedYear + parseInt(years[0], 10);
				endYear = this._selectedYear + parseInt(years[1], 10);
			}
			else {
				year = parseInt(years[0], 10);
				endYear = parseInt(years[1], 10);
			}
			year = (minDate ? Math.max(year, minDate.getFullYear()) : year);
			endYear = (maxDate ? Math.min(endYear, maxDate.getFullYear()) : endYear);
			html += '<select class="calendar_newYear" onchange="popUpCal._selectMonthYear(' +
				this._id + ', this, \'Y\');" ' + 'onclick="popUpCal._clickMonthYear(' +
				this._id + ');">';
			for (; year <= endYear; year++) {
				html += '<option value="' + year + '"' +
					(year == this._selectedYear ? ' selected="selected"' : '') +
					'>' + year + '</option>';
			}
			html += '</select>';
		}
		html += '</div><table class="calendar" cellpadding="0" cellspacing="0"><thead>' +
			'<tr class="calendar_titleRow">';
		var firstDay = this._get('firstDay');
		var changeFirstDay = this._get('changeFirstDay');
		var dayNames = this._get('dayNames');
		for (var dow = 0; dow < 7; dow++) { // days of the week
			html += '<td>' + (!changeFirstDay ? '' : '<a onclick="popUpCal._changeFirstDay(' +
				this._id + ', this);">') + dayNames[(dow + firstDay) % 7] +
				(changeFirstDay ? '</a>' : '') + '</td>';
		}
		html += '</tr></thead><tbody>';
		var daysInMonth = this._getDaysInMonth(this._selectedYear, this._selectedMonth);
		this._selectedDay = Math.min(this._selectedDay, daysInMonth);
		var leadDays = (this._getFirstDayOfMonth(this._selectedYear, this._selectedMonth) - firstDay + 7) % 7;
		var currentDate = new Date(this._currentYear, this._currentMonth, this._currentDay);
		var selectedDate = new Date(this._selectedYear, this._selectedMonth, this._selectedDay);
		var printDate = new Date(this._selectedYear, this._selectedMonth, 1 - leadDays);
		var numRows = Math.ceil((leadDays + daysInMonth) / 7); // calculate the number of rows to generate
		var customDate = this._get('customDate');
		var showOtherMonths = this._get('showOtherMonths');
		for (var row = 0; row < numRows; row++) { // create calendar rows
			html += '<tr class="calendar_daysRow">';
			for (var dow = 0; dow < 7; dow++) { // create calendar days
				var customSettings = (customDate ? customDate(printDate) : [true, '']);
				var otherMonth = (printDate.getMonth() != this._selectedMonth);
				var unselectable = otherMonth || !customSettings[0] ||
					(minDate && printDate < minDate) || (maxDate && printDate > maxDate);
				html += '<td class="calendar_daysCell' +
					((dow + firstDay + 6) % 7 >= 5 ? ' calendar_weekEndCell' : '') + // highlight weekends
					(otherMonth ? ' calendar_otherMonth' : '') + // highlight days from other months
					(printDate.getTime() == selectedDate.getTime() ? ' calendar_daysCellOver' : '') + // highlight selected day
					(unselectable ? ' calendar_unselectable' : '') +  // highlight unselectable days
					(otherMonth && !showOtherMonths ? '' : ' ' + customSettings[1] + // highlight custom dates
					(printDate.getTime() == currentDate.getTime() ? ' calendar_currentDay' : // highlight current day
					(printDate.getTime() == today.getTime() ? ' calendar_today' : ''))) + '"' + // highlight today (if different)
					(unselectable ? '' : ' onmouseover="$(this).addClass(\'calendar_daysCellOver\');"' +
					' onmouseout="$(this).removeClass(\'calendar_daysCellOver\');"' +
					' onclick="popUpCal._selectDay(' + this._id + ', this);"') + '>' + // actions
					(otherMonth ? (showOtherMonths ? printDate.getDate() : '&nbsp;') : // display for other months
					(unselectable ? printDate.getDate() : '<a>' + printDate.getDate() + '</a>')) + '</td>'; // display for this month
				printDate.setDate(printDate.getDate() + 1);
			}
			html += '</tr>';
		}
		html += '</tbody></table>' + (!closeAtTop && !this._inline ? controls : '') +
			'<div style="clear: both;"></div>' + (!$.browser.msie ? '' :
			'<!--[if lte IE 6.5]><iframe src="javascript:false;" class="calendar_cover"></iframe><![endif]-->');
		return html;
	},

	/* Adjust one of the date sub-fields. */
	_adjustDate: function(offset, period) {
		var date = new Date(this._selectedYear + (period == 'Y' ? offset : 0),
			this._selectedMonth + (period == 'M' ? offset : 0),
			this._selectedDay + (period == 'D' ? offset : 0));
		// ensure it is within the bounds set
		var minDate = this._get('minDate');
		var maxDate = this._get('maxDate');
		date = (minDate && date < minDate ? minDate : date);
		date = (maxDate && date > maxDate ? maxDate : date);
		this._selectedDay = date.getDate();
		this._selectedMonth = date.getMonth();
		this._selectedYear = date.getFullYear();
	},

	/* Find the number of days in a given month. */
	_getDaysInMonth: function(year, month) {
		return 32 - new Date(year, month, 32).getDate();
	},

	/* Find the day of the week of the first of a month. */
	_getFirstDayOfMonth: function(year, month) {
		return new Date(year, month, 1).getDay();
	},

	/* Determines if we should allow a "next/prev" month display change. */
	_canAdjustMonth: function(offset) {
		var date = new Date(this._selectedYear, this._selectedMonth + offset, 1);
		if (offset < 0) {
			date.setDate(this._getDaysInMonth(date.getFullYear(), date.getMonth()));
		}
		return this._isInRange(date);
	},

	/* Is the given date in the accepted range? */
	_isInRange: function(date) {
		var minDate = this._get('minDate');
		var maxDate = this._get('maxDate');
		return ((!minDate || date >= minDate) && (!maxDate || date <= maxDate));
	},

	/* Format the given date for display. */
	_formatDate: function() {
		var day = this._currentDay = this._selectedDay;
		var month = this._currentMonth = this._selectedMonth;
		var year = this._currentYear = this._selectedYear;
		month++; // adjust javascript month
		var dateFormat = this._get('dateFormat');
		var dateString = '';
		for (var i = 0; i < 3; i++) {
			dateString += dateFormat.charAt(3) +
				(dateFormat.charAt(i) == 'D' ? (day < 10 ? '0' : '') + day :
				(dateFormat.charAt(i) == 'M' ? (month < 10 ? '0' : '') + month :
				(dateFormat.charAt(i) == 'Y' ? year : '?')));
		}
		return dateString.substring(dateFormat.charAt(3) ? 1 : 0);
	}
});

/* jQuery extend now ignores nulls! */
function extendRemove(target, props) {
	$.extend(target, props);
	for (var name in props) {
		if (props[name] == null) {
			target[name] = null;
		}
	}
	return target;
}

/* Attach the calendar to a jQuery selection.
   @param  settings  object - the new settings to use for this calendar instance (anonymous)
   @return jQuery object - for chaining further calls */
$.fn.calendar = function(settings) {
	return this.each(function() {
		// check for settings on the control itself - in namespace 'cal:'
		var inlineSettings = null;
		for (attrName in popUpCal._defaults) {
			var attrValue = this.getAttribute('cal:' + attrName);
			if (attrValue) {
				inlineSettings = inlineSettings || {};
				try {
					inlineSettings[attrName] = eval(attrValue);
				}
				catch (err) {
					inlineSettings[attrName] = attrValue;
				}
			}
		}
		var nodeName = this.nodeName.toLowerCase();
		if (nodeName == 'input') {
			var instSettings = (inlineSettings ? $.extend($.extend({}, settings || {}),
				inlineSettings || {}) : settings); // clone and customise
			var inst = (inst && !inlineSettings ? inst :
				new PopUpCalInstance(instSettings, false));
			popUpCal._connectCalendar(this, inst);
		} 
		else if (nodeName == 'div' || nodeName == 'span') {
			var instSettings = $.extend($.extend({}, settings || {}),
				inlineSettings || {}); // clone and customise
			var inst = new PopUpCalInstance(instSettings, true);
			popUpCal._inlineCalendar(this, inst);
		}
	});
};

/* Initialise the calendar. */
$(document).ready(function() {
   popUpCal = new PopUpCal(); // singleton instance
});