/* jQuery UI Date Picker v3.4.3 (previously jQuery Calendar)
   Written by Marc Grabanski (m@marcgrabanski.com) and Keith Wood (kbwood@virginbroadband.com.au).

   Copyright (c) 2007 Marc Grabanski (http://marcgrabanski.com/code/ui-datepicker)
   Dual licensed under the MIT (MIT-LICENSE.txt)
   and GPL (GPL-LICENSE.txt) licenses.
   Date: 09-03-2007  */
   
;(function($) { // hide the namespace

/* Date picker manager.
   Use the singleton instance of this class, $.datepicker, to interact with the date picker.
   Settings for (groups of) date pickers are maintained in an instance object
   (DatepickerInstance), allowing multiple different settings on the same page. */

function Datepicker() {
this.debug = false; // Change this to true to start debugging
this._nextId = 0; // Next ID for a date picker instance
this._inst = []; // List of instances indexed by ID
this._curInst = null; // The current instance in use
this._disabledInputs = []; // List of date picker inputs that have been disabled
this._datepickerShowing = false; // True if the popup picker is showing , false if not
this._inDialog = false; // True if showing within a "dialog", false if not
this.regional = []; // Available regional settings, indexed by language code
this.regional[''] = { // Default regional settings
	clearText: 'Clear', // Display text for clear link
	clearStatus: 'Erase the current date', // Status text for clear link
	closeText: 'Close', // Display text for close link
	closeStatus: 'Close without change', // Status text for close link
	prevText: '<Prev', // Display text for previous month link
	prevStatus: 'Show the previous month', // Status text for previous month link
	nextText: 'Next>', // Display text for next month link
	nextStatus: 'Show the next month', // Status text for next month link
	currentText: 'Today', // Display text for current month link
	currentStatus: 'Show the current month', // Status text for current month link
	monthNames: ['January','February','March','April','May','June',
	'July','August','September','October','November','December'], // Names of months for drop-down and formatting
	monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'], // For formatting
	monthStatus: 'Show a different month', // Status text for selecting a month
	yearStatus: 'Show a different year', // Status text for selecting a year
	weekHeader: 'Wk', // Header for the week of the year column
	weekStatus: 'Week of the year', // Status text for the week of the year column
	dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'], // For formatting
	dayNamesShort: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'], // For formatting
	dayNamesMin: ['Su','Mo','Tu','We','Th','Fr','Sa'], // Column headings for days starting at Sunday
	dayStatus: 'Set DD as first week day', // Status text for the day of the week selection
	dateStatus: 'Select DD, M d', // Status text for the date selection
	dateFormat: 'dd/mm/yy', // See format options on parseDate
	firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
	initStatus: 'Select a date', // Initial Status text on opening
	isRTL: false // True if right-to-left language, false if left-to-right
};
this._defaults = { // Global defaults for all the date picker instances
	showOn: 'focus', // 'focus' for popup on focus,
	// 'button' for trigger button, or 'both' for either
	showAnim: 'show', // Name of jQuery animation for popup
	defaultDate: null, // Used when field is blank: actual date,
	// +/-number for offset from today, null for today
	appendText: '', // Display text following the input box, e.g. showing the format
	buttonText: '...', // Text for trigger button
	buttonImage: '', // URL for trigger button image
	buttonImageOnly: false, // True if the image appears alone, false if it appears on a button
	closeAtTop: true, // True to have the clear/close at the top,
	// false to have them at the bottom
	mandatory: false, // True to hide the Clear link, false to include it
	hideIfNoPrevNext: false, // True to hide next/previous month links
	// if not applicable, false to just disable them
	changeMonth: false, // True if month can be selected directly, false if only prev/next
	changeYear: false, // True if year can be selected directly, false if only prev/next
	yearRange: '-10:+10', // Range of years to display in drop-down,
	// either relative to current year (-nn:+nn) or absolute (nnnn:nnnn)
	changeFirstDay: true, // True to click on day name to change, false to remain as set
	showOtherMonths: false, // True to show dates in other months, false to leave blank
	showWeeks: false, // True to show week of the year, false to omit
	calculateWeek: this.iso8601Week, // How to calculate the week of the year,
	// takes a Date and returns the number of the week for it
	shortYearCutoff: '+10', // Short year values < this are in the current century,
	// > this are in the previous century, 
	// string value starting with '+' for current year + value
	showStatus: false, // True to show status bar at bottom, false to not show it
	statusForDate: this.dateStatus, // Function to provide status text for a date -
	// takes date and instance as parameters, returns display text
	minDate: null, // The earliest selectable date, or null for no limit
	maxDate: null, // The latest selectable date, or null for no limit
	speed: 'normal', // Speed of display/closure
	beforeShowDay: null, // Function that takes a date and returns an array with
	// [0] = true if selectable, false if not,
	// [1] = custom CSS class name(s) or '', e.g. $.datepicker.noWeekends
	beforeShow: null, // Function that takes an input field and
	// returns a set of custom settings for the date picker
	onSelect: null, // Define a callback function when a date is selected
	onClose: null, // Define a callback function when the datepicker is closed
	numberOfMonths: 1, // Number of months to show at a time
	stepMonths: 1, // Number of months to step back/forward
	rangeSelect: false, // Allows for selecting a date range on one date picker
	rangeSeparator: ' - ' // Text between two dates in a range
};
$.extend(this._defaults, this.regional['']);
this._datepickerDiv = $('<div id="datepicker_div">');
}

$.extend(Datepicker.prototype, {
/* Class name added to elements to indicate already configured with a date picker. */
markerClassName: 'hasDatepicker',

/* Debug logging (if enabled). */
log: function () {
	if (this.debug)
	console.log.apply('', arguments);
},

/* Register a new date picker instance - with custom settings. */
_register: function(inst) {
	var id = this._nextId++;
	this._inst[id] = inst;
	return id;
},

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

/* Override the default settings for all instances of the date picker. 
   @param  settings  object - the new settings to use as defaults (anonymous object)
   @return the manager object */
setDefaults: function(settings) {
	extendRemove(this._defaults, settings || {});
	return this;
},

/* Attach the date picker to a jQuery selection.
   @param  target    element - the target input field or division or span
   @param  settings  object - the new settings to use for this date picker instance (anonymous) */
_attachDatepicker: function(target, settings) {
	// check for settings on the control itself - in namespace 'date:'
	var inlineSettings = null;
	for (attrName in this._defaults) {
	var attrValue = target.getAttribute('date:' + attrName);
	if (attrValue) {
		inlineSettings = inlineSettings || {};
		try {
		inlineSettings[attrName] = eval(attrValue);
		} catch (err) {
		inlineSettings[attrName] = attrValue;
		}
	}
	}
	var nodeName = target.nodeName.toLowerCase();
	var instSettings = (inlineSettings ? 
	$.extend(settings || {}, inlineSettings || {}) : settings);
	if (nodeName == 'input') {
	var inst = (inst && !inlineSettings ? inst :
		new DatepickerInstance(instSettings, false));
	this._connectDatepicker(target, inst);
	} else if (nodeName == 'div' || nodeName == 'span') {
	var inst = new DatepickerInstance(instSettings, true);
	this._inlineDatepicker(target, inst);
	}
},

/* Detach a datepicker from its control.
   @param  target    element - the target input field or division or span */
_destroyDatepicker: function(target) {
	var nodeName = target.nodeName.toLowerCase();
	var calId = target._calId;
	target._calId = null;
	var $target = $(target);
	if (nodeName == 'input') {
	$target.siblings('.datepicker_append').replaceWith('').end()
		.siblings('.datepicker_trigger').replaceWith('').end()
		.removeClass(this.markerClassName)
		.unbind('focus', this._showDatepicker)
		.unbind('keydown', this._doKeyDown)
		.unbind('keypress', this._doKeyPress);
	var wrapper = $target.parents('.datepicker_wrap');
	if (wrapper)
		wrapper.replaceWith(wrapper.html());
	} else if (nodeName == 'div' || nodeName == 'span')
	$target.removeClass(this.markerClassName).empty();
	if ($('input[_calId=' + calId + ']').length == 0)
	// clean up if last for this ID
	this._inst[calId] = null;
},

/* Enable the date picker to a jQuery selection.
   @param  target    element - the target input field or division or span */
_enableDatepicker: function(target) {
	target.disabled = false;
	$(target).siblings('button.datepicker_trigger').each(function() { this.disabled = false; }).end()
	.siblings('img.datepicker_trigger').css({opacity: '1.0', cursor: ''});
	this._disabledInputs = $.map(this._disabledInputs,
	function(value) { return (value == target ? null : value); }); // delete entry
},

/* Disable the date picker to a jQuery selection.
   @param  target    element - the target input field or division or span */
_disableDatepicker: function(target) {
	target.disabled = true;
	$(target).siblings('button.datepicker_trigger').each(function() { this.disabled = true; }).end()
	.siblings('img.datepicker_trigger').css({opacity: '0.5', cursor: 'default'});
	this._disabledInputs = $.map($.datepicker._disabledInputs,
	function(value) { return (value == target ? null : value); }); // delete entry
	this._disabledInputs[$.datepicker._disabledInputs.length] = target;
},

/* Is the first field in a jQuery collection disabled as a datepicker?
   @param  target    element - the target input field or division or span
   @return boolean - true if disabled, false if enabled */
_isDisabledDatepicker: function(target) {
	if (!target)
	return false;
	for (var i = 0; i < this._disabledInputs.length; i++) {
	if (this._disabledInputs[i] == target)
		return true;
	}
	return false;
},

/* Update the settings for a date picker attached to an input field or division.
   @param  target  element - the target input field or division or span
   @param  name    string - the name of the setting to change or
                   object - the new settings to update
   @param  value   any - the new value for the setting (omit if above is an object) */
_changeDatepicker: function(target, name, value) {
	var settings = name || {};
	if (typeof name == 'string') {
	settings = {};
	settings[name] = value;
	}
	if (inst = this._getInst(target._calId)) {
	extendRemove(inst._settings, settings);
	this._updateDatepicker(inst);
	}
},

/* Set the dates for a jQuery selection.
   @param  target   element - the target input field or division or span
   @param  date     Date - the new date
   @param  endDate  Date - the new end date for a range (optional) */
_setDateDatepicker: function(target, date, endDate) {
	if (inst = this._getInst(target._calId)) {
	inst._setDate(date, endDate);
	this._updateDatepicker(inst);
	}
},

/* Get the date(s) for the first entry in a jQuery selection.
   @param  target  element - the target input field or division or span
   @return Date - the current date or
           Date[2] - the current dates for a range */
_getDateDatepicker: function(target) {
	var inst = this._getInst(target._calId);
	return (inst ? inst._getDate() : null);
},

/* Handle keystrokes. */
_doKeyDown: function(e) {
	var inst = $.datepicker._getInst(this._calId);
	if ($.datepicker._datepickerShowing)
	switch (e.keyCode) {
		case 9:  $.datepicker._hideDatepicker(null, '');
			break; // hide on tab out
		case 13: $.datepicker._selectDay(inst, inst._selectedMonth, inst._selectedYear,
			$('td.datepicker_daysCellOver', inst._datepickerDiv)[0]);
			return false; // don't submit the form
			break; // select the value on enter
		case 27: $.datepicker._hideDatepicker(null, inst._get('speed'));
			break; // hide on escape
		case 33: $.datepicker._adjustDate(inst,
			(e.ctrlKey ? -1 : -inst._get('stepMonths')), (e.ctrlKey ? 'Y' : 'M'));
			break; // previous month/year on page up/+ ctrl
		case 34: $.datepicker._adjustDate(inst,
			(e.ctrlKey ? +1 : +inst._get('stepMonths')), (e.ctrlKey ? 'Y' : 'M'));
			break; // next month/year on page down/+ ctrl
		case 35: if (e.ctrlKey) $.datepicker._clearDate(inst);
			break; // clear on ctrl+end
		case 36: if (e.ctrlKey) $.datepicker._gotoToday(inst);
			break; // current on ctrl+home
		case 37: if (e.ctrlKey) $.datepicker._adjustDate(inst, -1, 'D');
			break; // -1 day on ctrl+left
		case 38: if (e.ctrlKey) $.datepicker._adjustDate(inst, -7, 'D');
			break; // -1 week on ctrl+up
		case 39: if (e.ctrlKey) $.datepicker._adjustDate(inst, +1, 'D');
			break; // +1 day on ctrl+right
		case 40: if (e.ctrlKey) $.datepicker._adjustDate(inst, +7, 'D');
			break; // +1 week on ctrl+down
	}
	else if (e.keyCode == 36 && e.ctrlKey) // display the date picker on ctrl+home
	$.datepicker._showDatepicker(this);
},

/* Filter entered characters - based on date format. */
_doKeyPress: function(e) {
	var inst = $.datepicker._getInst(this._calId);
	var chars = $.datepicker._possibleChars(inst._get('dateFormat'));
	var chr = String.fromCharCode(e.charCode == undefined ? e.keyCode : e.charCode);
	return e.ctrlKey || (chr < ' ' || !chars || chars.indexOf(chr) > -1);
},

/* Attach the date picker to an input field. */
_connectDatepicker: function(target, inst) {
	var input = $(target);
	if (input.is('.' + this.markerClassName))
	return;
	var appendText = inst._get('appendText');
	var isRTL = inst._get('isRTL');
	if (appendText) {
	if (isRTL)
		input.before('<span class="datepicker_append">' + appendText);
	else
		input.after('<span class="datepicker_append">' + appendText);
	}
	var showOn = inst._get('showOn');
	if (showOn == 'focus' || showOn == 'both') // pop-up date picker when in the marked field
	input.focus(this._showDatepicker);
	if (showOn == 'button' || showOn == 'both') { // pop-up date picker when button clicked
	input.wrap('<span class="datepicker_wrap">');
	var buttonText = inst._get('buttonText');
	var buttonImage = inst._get('buttonImage');
	var trigger = $(inst._get('buttonImageOnly') ? 
		$('<img>').addClass('datepicker_trigger').attr({ src: buttonImage, alt: buttonText, title: buttonText }) :
		$('<button>').addClass('datepicker_trigger').attr({ type: 'button' }).html(buttonImage != '' ? 
			$('<img>').attr({ src:buttonImage, alt:buttonText, title:buttonText }) : buttonText));
	if (isRTL)
		input.before(trigger);
	else
		input.after(trigger);
	trigger.click(function() {
		if ($.datepicker._datepickerShowing && $.datepicker._lastInput == target)
		$.datepicker._hideDatepicker();
		else
		$.datepicker._showDatepicker(target);
	});
        }
	input.addClass(this.markerClassName).keydown(this._doKeyDown).keypress(this._doKeyPress)
	.bind("setData.datepicker", function(event, key, value) {
		inst._settings[key] = value;
	}).bind("getData.datepicker", function(event, key) {
		return inst._get(key);
	});
	input[0]._calId = inst._id;
},

/* Attach an inline date picker to a div. */
_inlineDatepicker: function(target, inst) {
	var input = $(target);
	if (input.is('.' + this.markerClassName))
	return;
	input.addClass(this.markerClassName).append(inst._datepickerDiv)
	.bind("setData.datepicker", function(event, key, value){
		inst._settings[key] = value;
	}).bind("getData.datepicker", function(event, key){
		return inst._get(key);
	});
	input[0]._calId = inst._id;
	this._updateDatepicker(inst);
},

/* Tidy up after displaying the date picker. */
_inlineShow: function(inst) {
	var numMonths = inst._getNumberOfMonths(); // fix width for dynamic number of date pickers
	inst._datepickerDiv.width(numMonths[1] * $('.datepicker', inst._datepickerDiv[0]).width());
}, 

/* Pop-up the date picker in a "dialog" box.
   @param  input     element - ignored
   @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 date picker instance's settings (anonymous object)
   @param  pos       int[2] - coordinates for the dialog's position within the screen or
                     event - with x/y coordinates or
                     leave empty for default (screen centre)
   @return the manager object */
_dialogDatepicker: function(input, dateText, onSelect, settings, pos) {
	var inst = this._dialogInst; // internal instance
	if (!inst) {
	inst = this._dialogInst = new DatepickerInstance({}, 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);

	this._pos = (pos ? (pos.length ? pos : [pos.pageX, pos.pageY]) : null);
	if (!this._pos) {
	var browserWidth = window.innerWidth || document.documentElement.clientWidth ||document.body.clientWidth;
	var browserHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
	var scrollX = document.documentElement.scrollLeft || document.body.scrollLeft;
	var scrollY = document.documentElement.scrollTop || document.body.scrollTop;
	this._pos = // should use actual width/height below
		[(browserWidth / 2) - 100 + scrollX, (browserHeight / 2) - 150 + scrollY];
	}

	// 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._datepickerDiv.addClass('datepicker_dialog');
	this._showDatepicker(this._dialogInput[0]);
	if ($.blockUI)
	$.blockUI(this._datepickerDiv);
	return this;
},

/* Pop-up the date picker for a given input field.
   @param  input  element - the input field attached to the date picker or
                  event - if triggered by focus */
_showDatepicker: function(input) {
	input = input.target || input;
	if (input.nodeName.toLowerCase() != 'input') // find from button/image trigger
	input = $('input', input.parentNode)[0];
	if ($.datepicker._isDisabledDatepicker(input) || $.datepicker._lastInput == input) // already here
	return;
	var inst = $.datepicker._getInst(input._calId);
	var beforeShow = inst._get('beforeShow');
	extendRemove(inst._settings, (beforeShow ? beforeShow.apply(input, [input, inst]) : {}));
	$.datepicker._hideDatepicker(null, '');
	$.datepicker._lastInput = input;
	inst._setDateFromField(input);
	if ($.datepicker._inDialog) // hide cursor
	input.value = '';
	if (!$.datepicker._pos) { // position below input
	$.datepicker._pos = $.datepicker._findPos(input);
	$.datepicker._pos[1] += input.offsetHeight; // add the height
	}
	var isFixed = false;
	$(input).parents().each(function() {
	isFixed |= $(this).css('position') == 'fixed';
	});
	if (isFixed && $.browser.opera) { // correction for Opera when fixed and scrolled
	$.datepicker._pos[0] -= document.documentElement.scrollLeft;
	$.datepicker._pos[1] -= document.documentElement.scrollTop;
	}
	inst._datepickerDiv.css('position', ($.datepicker._inDialog && $.blockUI ?
	'static' : (isFixed ? 'fixed' : 'absolute')))
	.css({ left: $.datepicker._pos[0] + 'px', top: $.datepicker._pos[1] + 'px' });
	$.datepicker._pos = null;
	inst._rangeStart = null;
	$.datepicker._updateDatepicker(inst);
	if (!inst._inline) {
	var speed = inst._get('speed');
	var postProcess = function() {
		$.datepicker._datepickerShowing = true;
		$.datepicker._afterShow(inst);
	};
	var showAnim = inst._get('showAnim') || 'show';
	inst._datepickerDiv[showAnim](speed, postProcess);
	if (speed == '')
		postProcess();
	if (inst._input[0].type != 'hidden')
		inst._input[0].focus();
	$.datepicker._curInst = inst;
	}
},

/* Generate the date picker content. */
_updateDatepicker: function(inst) {
	inst._datepickerDiv.empty().append(inst._generateDatepicker());
	var numMonths = inst._getNumberOfMonths();
	if (numMonths[0] != 1 || numMonths[1] != 1)
	inst._datepickerDiv.addClass('datepicker_multi');
	else
	inst._datepickerDiv.removeClass('datepicker_multi');

	if (inst._get('isRTL'))
	inst._datepickerDiv.addClass('datepicker_rtl');
	else
	inst._datepickerDiv.removeClass('datepicker_rtl');

	if (inst._input && inst._input[0].type != 'hidden')
	inst._input[0].focus();
},

/* Tidy up after displaying the date picker. */
_afterShow: function(inst) {
	var numMonths = inst._getNumberOfMonths(); // fix width for dynamic number of date pickers
	inst._datepickerDiv.width(numMonths[1] * $('.datepicker', inst._datepickerDiv[0])[0].offsetWidth);
	if ($.browser.msie && parseInt($.browser.version) < 7) { // fix IE < 7 select problems
	$('#datepicker_cover').css({width: inst._datepickerDiv.width() + 4,
		height: inst._datepickerDiv.height() + 4});
	}
	// re-position on screen if necessary
	var isFixed = inst._datepickerDiv.css('position') == 'fixed';
	var pos = inst._input ? $.datepicker._findPos(inst._input[0]) : null;
	var browserWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
	var browserHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
	var scrollX = (isFixed ? 0 : document.documentElement.scrollLeft || document.body.scrollLeft);
	var scrollY = (isFixed ? 0 : document.documentElement.scrollTop || document.body.scrollTop);
	// reposition date picker horizontally if outside the browser window
	if ((inst._datepickerDiv.offset().left + inst._datepickerDiv.width() -
		(isFixed && $.browser.msie ? document.documentElement.scrollLeft : 0)) >
		(browserWidth + scrollX)) {
	inst._datepickerDiv.css('left', Math.max(scrollX,
		pos[0] + (inst._input ? $(inst._input[0]).width() : null) - inst._datepickerDiv.width() -
		(isFixed && $.browser.opera ? document.documentElement.scrollLeft : 0)) + 'px');
	}
	// reposition date picker vertically if outside the browser window
	if ((inst._datepickerDiv.offset().top + inst._datepickerDiv.height() -
		(isFixed && $.browser.msie ? document.documentElement.scrollTop : 0)) >
		(browserHeight + scrollY) ) {
	inst._datepickerDiv.css('top', Math.max(scrollY,
		pos[1] - (this._inDialog ? 0 : inst._datepickerDiv.height()) -
		(isFixed && $.browser.opera ? document.documentElement.scrollTop : 0)) + 'px');
	}
},

/* Find an object's position on the screen. */
_findPos: function(obj) {
        while (obj && (obj.type == 'hidden' || obj.nodeType != 1)) {
            obj = obj.nextSibling;
        }
        var position = $(obj).offset();
    return [position.left, position.top];
},

/* Hide the date picker from view.
   @param  input  element - the input field attached to the date picker
   @param  speed  string - the speed at which to close the date picker */
_hideDatepicker: function(input, speed) {
	var inst = this._curInst;
	if (!inst)
	return;
	var rangeSelect = inst._get('rangeSelect');
	if (rangeSelect && this._stayOpen) {
	this._selectDate(inst, inst._formatDate(
		inst._currentDay, inst._currentMonth, inst._currentYear));
	}
	this._stayOpen = false;
	if (this._datepickerShowing) {
	speed = (speed != null ? speed : inst._get('speed'));
	var showAnim = inst._get('showAnim');
	inst._datepickerDiv[(showAnim == 'slideDown' ? 'slideUp' :
		(showAnim == 'fadeIn' ? 'fadeOut' : 'hide'))](speed, function() {
		$.datepicker._tidyDialog(inst);
	});
	if (speed == '')
		this._tidyDialog(inst);
	var onClose = inst._get('onClose');
	if (onClose) {
		onClose.apply((inst._input ? inst._input[0] : null),
		[inst._getDate(), inst]);  // trigger custom callback
	}
	this._datepickerShowing = false;
	this._lastInput = null;
	inst._settings.prompt = null;
	if (this._inDialog) {
		this._dialogInput.css({ position: 'absolute', left: '0', top: '-100px' });
		if ($.blockUI) {
		$.unblockUI();
		$('body').append(this._datepickerDiv);
		}
	}
	this._inDialog = false;
	}
	this._curInst = null;
},

/* Tidy up after a dialog display. */
_tidyDialog: function(inst) {
	inst._datepickerDiv.removeClass('datepicker_dialog').unbind('.datepicker');
	$('.datepicker_prompt', inst._datepickerDiv).remove();
},

/* Close date picker if clicked elsewhere. */
_checkExternalClick: function(event) {
	if (!$.datepicker._curInst)
	return;
	var $target = $(event.target);
	if (($target.parents("#datepicker_div").length == 0) &&
		($target.attr('class') != 'datepicker_trigger') &&
		$.datepicker._datepickerShowing && !($.datepicker._inDialog && $.blockUI)) {
	$.datepicker._hideDatepicker(null, '');
	}
},

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

/* Action for current link. */
_gotoToday: function(id) {
	var date = new Date();
	var inst = this._getInst(id);
	inst._selectedDay = date.getDate();
	inst._drawMonth = inst._selectedMonth = date.getMonth();
	inst._drawYear = 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' ? '_drawMonth' : '_drawYear'] =
	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, day) {
	var inst = this._getInst(id);
	inst._settings.firstDay = day;
	this._updateDatepicker(inst);
},

/* Action for selecting a day. */
_selectDay: function(id, month, year, td) {
	if ($(td).is('.datepicker_unselectable'))
	return;
	var inst = this._getInst(id);
	var rangeSelect = inst._get('rangeSelect');
	if (rangeSelect) {
	if (!this._stayOpen) {
		$('.datepicker td').removeClass('datepicker_currentDay');
		$(td).addClass('datepicker_currentDay');
	} 
	this._stayOpen = !this._stayOpen;
	}
	inst._selectedDay = inst._currentDay = $('a', td).html();
	inst._selectedMonth = inst._currentMonth = month;
	inst._selectedYear = inst._currentYear = year;
	this._selectDate(id, inst._formatDate(
	inst._currentDay, inst._currentMonth, inst._currentYear));
	if (this._stayOpen) {
	inst._endDay = inst._endMonth = inst._endYear = null;
	inst._rangeStart = new Date(inst._currentYear, inst._currentMonth, inst._currentDay);
	this._updateDatepicker(inst);
	}
	else if (rangeSelect) {
	inst._endDay = inst._currentDay;
	inst._endMonth = inst._currentMonth;
	inst._endYear = inst._currentYear;
	inst._selectedDay = inst._currentDay = inst._rangeStart.getDate();
	inst._selectedMonth = inst._currentMonth = inst._rangeStart.getMonth();
	inst._selectedYear = inst._currentYear = inst._rangeStart.getFullYear();
	inst._rangeStart = null;
	if (inst._inline)
		this._updateDatepicker(inst);
	}
},

/* Erase the input field and hide the date picker. */
_clearDate: function(id) {
	var inst = this._getInst(id);
	if (inst._get('mandatory'))
	return;
	this._stayOpen = false;
	inst._endDay = inst._endMonth = inst._endYear = inst._rangeStart = null;
	this._selectDate(inst, '');
},

/* 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._rangeStart)
	dateStr = inst._formatDate(inst._rangeStart) + inst._get('rangeSeparator') + dateStr;
	if (inst._input)
	inst._input.val(dateStr);
	var onSelect = inst._get('onSelect');
	if (onSelect)
	onSelect.apply((inst._input ? inst._input[0] : null), [dateStr, inst]);  // trigger custom callback
	else if (inst._input)
	inst._input.trigger('change'); // fire the change event
	if (inst._inline)
	this._updateDatepicker(inst);
	else if (!this._stayOpen) {
	this._hideDatepicker(null, inst._get('speed'));
	this._lastInput = inst._input[0];
	if (typeof(inst._input[0]) != 'object')
		inst._input[0].focus(); // restore focus
	this._lastInput = null;
	}
},

/* Set as beforeShowDay 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), ''];
},

/* Set as calculateWeek to determine the week of the year based on the ISO 8601 definition.
   @param  date  Date - the date to get the week for
   @return  number - the number of the week within the year that contains this date */
iso8601Week: function(date) {
	var checkDate = new Date(date.getFullYear(), date.getMonth(), date.getDate(), (date.getTimezoneOffset() / -60));
	var firstMon = new Date(checkDate.getFullYear(), 1 - 1, 4); // First week always contains 4 Jan
	var firstDay = firstMon.getDay() || 7; // Day of week: Mon = 1, ..., Sun = 7
	firstMon.setDate(firstMon.getDate() + 1 - firstDay); // Preceding Monday
	if (firstDay < 4 && checkDate < firstMon) { // Adjust first three days in year if necessary
	checkDate.setDate(checkDate.getDate() - 3); // Generate for previous year
	return $.datepicker.iso8601Week(checkDate);
	} else if (checkDate > new Date(checkDate.getFullYear(), 12 - 1, 28)) { // Check last three days in year
	firstDay = new Date(checkDate.getFullYear() + 1, 1 - 1, 4).getDay() || 7;
	if (firstDay > 4 && (checkDate.getDay() || 7) < firstDay - 3) { // Adjust if necessary
		checkDate.setDate(checkDate.getDate() + 3); // Generate for next year
		return $.datepicker.iso8601Week(checkDate);
	}
	}
	return Math.floor(((checkDate - firstMon) / 86400000) / 7) + 1; // Weeks to given date
},

/* Provide status text for a particular date.
   @param  date  the date to get the status for
   @param  inst  the current datepicker instance
   @return  the status display text for this date */
dateStatus: function(date, inst) {
	return $.datepicker.formatDate(inst._get('dateStatus'), date, inst._getFormatConfig());
},

/* Parse a string value into a date object.
   The format can be combinations of the following:
   d  - day of month (no leading zero)
   dd - day of month (two digit)
   D  - day name short
   DD - day name long
   m  - month of year (no leading zero)
   mm - month of year (two digit)
   M  - month name short
   MM - month name long
   y  - year (two digit)
   yy - year (four digit)
   '...' - literal text
   '' - single quote

   @param  format           String - the expected format of the date
   @param  value            String - the date in the above format
   @param  settings  Object - attributes include:
                     shortYearCutoff  Number - the cutoff year for determining the century (optional)
                     dayNamesShort    String[7] - abbreviated names of the days from Sunday (optional)
                     dayNames         String[7] - names of the days from Sunday (optional)
                     monthNamesShort  String[12] - abbreviated names of the months (optional)
                     monthNames       String[12] - names of the months (optional)
   @return  Date - the extracted date value or null if value is blank */
parseDate: function (format, value, settings) {
	if (format == null || value == null)
	throw 'Invalid arguments';
	value = (typeof value == 'object' ? value.toString() : value + '');
	if (value == '')
	return null;
	var shortYearCutoff = (settings ? settings.shortYearCutoff : null) || this._defaults.shortYearCutoff;
	var dayNamesShort = (settings ? settings.dayNamesShort : null) || this._defaults.dayNamesShort;
	var dayNames = (settings ? settings.dayNames : null) || this._defaults.dayNames;
	var monthNamesShort = (settings ? settings.monthNamesShort : null) || this._defaults.monthNamesShort;
	var monthNames = (settings ? settings.monthNames : null) || this._defaults.monthNames;
	var year = -1;
	var month = -1;
	var day = -1;
	var literal = false;
	// Check whether a format character is doubled
	var lookAhead = function(match) {
	var matches = (iFormat + 1 < format.length && format.charAt(iFormat + 1) == match);
	if (matches)
		iFormat++;
	return matches;
	};
	// Extract a number from the string value
	var getNumber = function(match) {
	lookAhead(match);
	var size = (match == 'y' ? 4 : 2);
	var num = 0;
	while (size > 0 && iValue < value.length &&
		value.charAt(iValue) >= '0' && value.charAt(iValue) <= '9') {
		num = num * 10 + (value.charAt(iValue++) - 0);
		size--;
	}
	if (size == (match == 'y' ? 4 : 2))
		throw 'Missing number at position ' + iValue;
	return num;
	};
	// Extract a name from the string value and convert to an index
	var getName = function(match, shortNames, longNames) {
	var names = (lookAhead(match) ? longNames : shortNames);
	var size = 0;
	for (var j = 0; j < names.length; j++)
		size = Math.max(size, names[j].length);
	var name = '';
	var iInit = iValue;
	while (size > 0 && iValue < value.length) {
		name += value.charAt(iValue++);
		for (var i = 0; i < names.length; i++)
		if (name == names[i])
			return i + 1;
		size--;
	}
	throw 'Unknown name at position ' + iInit;
	};
	// Confirm that a literal character matches the string value
	var checkLiteral = function() {
	if (value.charAt(iValue) != format.charAt(iFormat))
		throw 'Unexpected literal at position ' + iValue;
	iValue++;
	};
	var iValue = 0;
	for (var iFormat = 0; iFormat < format.length; iFormat++) {
	if (literal)
		if (format.charAt(iFormat) == "'" && !lookAhead("'"))
		literal = false;
		else
		checkLiteral();
	else
		switch (format.charAt(iFormat)) {
		case 'd':
			day = getNumber('d');
			break;
		case 'D': 
			getName('D', dayNamesShort, dayNames);
			break;
		case 'm': 
			month = getNumber('m');
			break;
		case 'M':
			month = getName('M', monthNamesShort, monthNames); 
			break;
		case 'y':
			year = getNumber('y');
			break;
		case "'":
			if (lookAhead("'"))
			checkLiteral();
			else
			literal = true;
			break;
		default:
			checkLiteral();
		}
	}
	if (year < 100) {
	year += new Date().getFullYear() - new Date().getFullYear() % 100 +
		(year <= shortYearCutoff ? 0 : -100);
	}
	var date = new Date(year, month - 1, day);
	if (date.getFullYear() != year || date.getMonth() + 1 != month || date.getDate() != day) {
	throw 'Invalid date'; // E.g. 31/02/*
	}
	return date;
},

/* Format a date object into a string value.
   The format can be combinations of the following:
   d  - day of month (no leading zero)
   dd - day of month (two digit)
   D  - day name short
   DD - day name long
   m  - month of year (no leading zero)
   mm - month of year (two digit)
   M  - month name short
   MM - month name long
   y  - year (two digit)
   yy - year (four digit)
   '...' - literal text
   '' - single quote

   @param  format    String - the desired format of the date
   @param  date      Date - the date value to format
   @param  settings  Object - attributes include:
                     dayNamesShort    String[7] - abbreviated names of the days from Sunday (optional)
                     dayNames         String[7] - names of the days from Sunday (optional)
                     monthNamesShort  String[12] - abbreviated names of the months (optional)
                     monthNames       String[12] - names of the months (optional)
   @return  String - the date in the above format */
formatDate: function (format, date, settings) {
	if (!date)
	return '';
	var dayNamesShort = (settings ? settings.dayNamesShort : null) || this._defaults.dayNamesShort;
	var dayNames = (settings ? settings.dayNames : null) || this._defaults.dayNames;
	var monthNamesShort = (settings ? settings.monthNamesShort : null) || this._defaults.monthNamesShort;
	var monthNames = (settings ? settings.monthNames : null) || this._defaults.monthNames;
	// Check whether a format character is doubled
	var lookAhead = function(match) {
	var matches = (iFormat + 1 < format.length && format.charAt(iFormat + 1) == match);
	if (matches)
		iFormat++;
	return matches;
	};
	// Format a number, with leading zero if necessary
	var formatNumber = function(match, value) {
	return (lookAhead(match) && value < 10 ? '0' : '') + value;
	};
	// Format a name, short or long as requested
	var formatName = function(match, value, shortNames, longNames) {
	return (lookAhead(match) ? longNames[value] : shortNames[value]);
	};
	var output = '';
	var literal = false;
	if (date) {
	for (var iFormat = 0; iFormat < format.length; iFormat++) {
		if (literal)
		if (format.charAt(iFormat) == "'" && !lookAhead("'"))
			literal = false;
		else
			output += format.charAt(iFormat);
		else
		switch (format.charAt(iFormat)) {
			case 'd':
			output += formatNumber('d', date.getDate()); 
			break;
			case 'D': 
			output += formatName('D', date.getDay(), dayNamesShort, dayNames);
			break;
			case 'm': 
			output += formatNumber('m', date.getMonth() + 1); 
			break;
			case 'M':
			output += formatName('M', date.getMonth(), monthNamesShort, monthNames); 
			break;
			case 'y':
			output += (lookAhead('y') ? date.getFullYear() : 
				(date.getYear() % 100 < 10 ? '0' : '') + date.getYear() % 100);
			break;
			case "'":
			if (lookAhead("'"))
				output += "'";
			else
				literal = true;
			break;
			default:
			output += format.charAt(iFormat);
		}
	}
	}
	return output;
},

/* Extract all possible characters from the date format. */
_possibleChars: function (format) {
	var chars = '';
	var literal = false;
	for (var iFormat = 0; iFormat < format.length; iFormat++)
	if (literal)
		if (format.charAt(iFormat) == "'" && !lookAhead("'"))
		literal = false;
		else
		chars += format.charAt(iFormat);
	else
		switch (format.charAt(iFormat)) {
		case 'd' || 'm' || 'y':
			chars += '0123456789'; 
			break;
		case 'D' || 'M':
			return null; // Accept anything
		case "'":
			if (lookAhead("'"))
			chars += "'";
			else
			literal = true;
			break;
		default:
			chars += format.charAt(iFormat);
		}
	return chars;
}
});

/* Individualised settings for date picker functionality applied to one or more related inputs.
   Instances are managed and manipulated through the Datepicker manager. */
function DatepickerInstance(settings, inline) {
this._id = $.datepicker._register(this);
this._selectedDay = 0; // Current date for selection
this._selectedMonth = 0; // 0-11
this._selectedYear = 0; // 4-digit year
this._drawMonth = 0; // Current month at start of datepicker
this._drawYear = 0;
this._input = null; // The attached input field
this._inline = inline; // True if showing inline, false if used in a popup
this._datepickerDiv = (!inline ? $.datepicker._datepickerDiv :
	$('<div id="datepicker_div_' + this._id + '" class="datepicker_inline">'));
// customise the date picker object - uses manager defaults if not overridden
this._settings = extendRemove(settings || {}); // clone
if (inline)
	this._setDate(this._getDefaultDate());
}

$.extend(DatepickerInstance.prototype, {
/* Get a setting value, defaulting if necessary. */
_get: function(name) {
	return this._settings[name] || $.datepicker._defaults[name];
},

/* Parse existing date and initialise date picker. */
_setDateFromField: function(input) {
	this._input = $(input);
	var dateFormat = this._get('dateFormat');
	var dates = this._input ? this._input.val().split(this._get('rangeSeparator')) : null; 
	this._endDay = this._endMonth = this._endYear = null;
	var date = defaultDate = this._getDefaultDate();
	if (dates.length > 0) {
	var settings = this._getFormatConfig();
	if (dates.length > 1) {
		date = $.datepicker.parseDate(dateFormat, dates[1], settings) || defaultDate;
		this._endDay = date.getDate();
		this._endMonth = date.getMonth();
		this._endYear = date.getFullYear();
	}
	try {
		date = $.datepicker.parseDate(dateFormat, dates[0], settings) || defaultDate;
	} catch (e) {
		$.datepicker.log(e);
		date = defaultDate;
	}
	}
	this._selectedDay = date.getDate();
	this._drawMonth = this._selectedMonth = date.getMonth();
	this._drawYear = this._selectedYear = date.getFullYear();
	this._currentDay = (dates[0] ? date.getDate() : 0);
	this._currentMonth = (dates[0] ? date.getMonth() : 0);
	this._currentYear = (dates[0] ? date.getFullYear() : 0);
	this._adjustDate();
},

/* Retrieve the default date shown on opening. */
_getDefaultDate: function() {
	var date = this._determineDate('defaultDate', new Date());
	var minDate = this._getMinMaxDate('min', true);
	var maxDate = this._getMinMaxDate('max');
	date = (minDate && date < minDate ? minDate : date);
	date = (maxDate && date > maxDate ? maxDate : date);
	return date;
},

/* A date may be specified as an exact value or a relative one. */
_determineDate: function(name, defaultDate) {
	var offsetNumeric = function(offset) {
	var date = new Date();
	date.setDate(date.getDate() + offset);
	return date;
	};
	var offsetString = function(offset, getDaysInMonth) {
	var date = new Date();
	var matches = /^([+-]?[0-9]+)\s*(d|D|w|W|m|M|y|Y)?$/.exec(offset);
	if (matches) {
		var year = date.getFullYear();
		var month = date.getMonth();
		var day = date.getDate();
		switch (matches[2] || 'd') {
		case 'd' : case 'D' :
			day += (matches[1] - 0); break;
		case 'w' : case 'W' :
			day += (matches[1] * 7); break;
		case 'm' : case 'M' :
			month += (matches[1] - 0); 
			day = Math.min(day, getDaysInMonth(year, month));
			break;
		case 'y': case 'Y' :
			year += (matches[1] - 0);
			day = Math.min(day, getDaysInMonth(year, month));
			break;
		}
		date = new Date(year, month, day);
	}
	return date;
	};
	var date = this._get(name);
	return (date == null ? defaultDate :
	(typeof date == 'string' ? offsetString(date, this._getDaysInMonth) :
	(typeof date == 'number' ? offsetNumeric(date) : date)));
},

/* Set the date(s) directly. */
_setDate: function(date, endDate) {
	this._selectedDay = this._currentDay = date.getDate();
	this._drawMonth = this._selectedMonth = this._currentMonth = date.getMonth();
	this._drawYear = this._selectedYear = this._currentYear = date.getFullYear();
	if (this._get('rangeSelect')) {
	if (endDate) {
		this._endDay = endDate.getDate();
		this._endMonth = endDate.getMonth();
		this._endYear = endDate.getFullYear();
	} else {
		this._endDay = this._currentDay;
		this._endMonth = this._currentMonth;
		this._endYear = this._currentYear;
	}
	}
	this._adjustDate();
},

/* Retrieve the date(s) directly. */
_getDate: function() {
	var startDate = (!this._currentYear || (this._input && this._input.val() == '') ? null :
	new Date(this._currentYear, this._currentMonth, this._currentDay));
	if (this._get('rangeSelect')) {
	return [startDate, (!this._endYear ? null :
		new Date(this._endYear, this._endMonth, this._endDay))];
	} else
	return startDate;
},

/* Generate the HTML for the current state of the date picker. */
_generateDatepicker: function() {
	var today = new Date();
	today = new Date(today.getFullYear(), today.getMonth(), today.getDate()); // clear time
	var showStatus = this._get('showStatus');
	var isRTL = this._get('isRTL');
	// build the date picker HTML
	var clear = (this._get('mandatory') ? '' :
	'<div class="datepicker_clear"><a onclick="jQuery.datepicker._clearDate(' + this._id + ');"' + 
	(showStatus ? this._addStatus(this._get('clearStatus') || '&#xa0;') : '') + '>' +
	this._get('clearText') + '</a></div>');
	var controls = '<div class="datepicker_control">' + (isRTL ? '' : clear) +
	'<div class="datepicker_close"><a onclick="jQuery.datepicker._hideDatepicker();"' +
	(showStatus ? this._addStatus(this._get('closeStatus') || '&#xa0;') : '') + '>' +
	this._get('closeText') + '</a></div>' + (isRTL ? clear : '')  + '</div>';
	var prompt = this._get('prompt');
	var closeAtTop = this._get('closeAtTop');
	var hideIfNoPrevNext = this._get('hideIfNoPrevNext');
	var numMonths = this._getNumberOfMonths();
	var stepMonths = this._get('stepMonths');
	var isMultiMonth = (numMonths[0] != 1 || numMonths[1] != 1);
	var minDate = this._getMinMaxDate('min', true);
	var maxDate = this._getMinMaxDate('max');
	var drawMonth = this._drawMonth;
	var drawYear = this._drawYear;
	if (maxDate) {
	var maxDraw = new Date(maxDate.getFullYear(),
		maxDate.getMonth() - numMonths[1] + 1, maxDate.getDate());
	maxDraw = (minDate && maxDraw < minDate ? minDate : maxDraw);
	while (new Date(drawYear, drawMonth, 1) > maxDraw) {
		drawMonth--;
		if (drawMonth < 0) {
		drawMonth = 11;
		drawYear--;
		}
	}
	}
	// controls and links
	var prev = '<div class="datepicker_prev">' + (this._canAdjustMonth(-1, drawYear, drawMonth) ? 
	'<a onclick="jQuery.datepicker._adjustDate(' + this._id + ', -' + stepMonths + ', \'M\');"' +
	(showStatus ? this._addStatus(this._get('prevStatus') || '&#xa0;') : '') + '>' +
	this._get('prevText') + '</a>' :
	(hideIfNoPrevNext ? '' : '<label>' + this._get('prevText') + '</label>')) + '</div>';
	var next = '<div class="datepicker_next">' + (this._canAdjustMonth(+1, drawYear, drawMonth) ?
	'<a onclick="jQuery.datepicker._adjustDate(' + this._id + ', +' + stepMonths + ', \'M\');"' +
	(showStatus ? this._addStatus(this._get('nextStatus') || '&#xa0;') : '') + '>' +
	this._get('nextText') + '</a>' :
	(hideIfNoPrevNext ? '>' : '<label>' + this._get('nextText') + '</label>')) + '</div>';
	var html = (prompt ? '<div class="datepicker_prompt">' + prompt + '</div>' : '') +
	(closeAtTop && !this._inline ? controls : '') +
	'<div class="datepicker_links">' + (isRTL ? next : prev) +
	(this._isInRange(today) ? '<div class="datepicker_current">' +
	'<a onclick="jQuery.datepicker._gotoToday(' + this._id + ');"' +
	(showStatus ? this._addStatus(this._get('currentStatus') || '&#xa0;') : '') + '>' +
	this._get('currentText') + '</a></div>' : '') + (isRTL ? prev : next) + '</div>';
	var showWeeks = this._get('showWeeks');
	for (var row = 0; row < numMonths[0]; row++)
	for (var col = 0; col < numMonths[1]; col++) {
		var selectedDate = new Date(drawYear, drawMonth, this._selectedDay);
		html += '<div class="datepicker_oneMonth' + (col == 0 ? ' datepicker_newRow' : '') + '">' +
		this._generateMonthYearHeader(drawMonth, drawYear, minDate, maxDate,
		selectedDate, row > 0 || col > 0) + // draw month headers
		'<table class="datepicker" cellpadding="0" cellspacing="0"><thead>' + 
		'<tr class="datepicker_titleRow">' +
		(showWeeks ? '<td>' + this._get('weekHeader') + '</td>' : '');
		var firstDay = this._get('firstDay');
		var changeFirstDay = this._get('changeFirstDay');
		var dayNames = this._get('dayNames');
		var dayNamesShort = this._get('dayNamesShort');
		var dayNamesMin = this._get('dayNamesMin');
		for (var dow = 0; dow < 7; dow++) { // days of the week
		var day = (dow + firstDay) % 7;
		var status = this._get('dayStatus') || '&#xa0;';
		status = (status.indexOf('DD') > -1 ? status.replace(/DD/, dayNames[day]) :
			status.replace(/D/, dayNamesShort[day]));
		html += '<td' + ((dow + firstDay + 6) % 7 >= 5 ? ' class="datepicker_weekEndCell"' : '') + '>' +
			(!changeFirstDay ? '<span' :
			'<a onclick="jQuery.datepicker._changeFirstDay(' + this._id + ', ' + day + ');"') + 
			(showStatus ? this._addStatus(status) : '') + ' title="' + dayNames[day] + '">' +
			dayNamesMin[day] + (changeFirstDay ? '</a>' : '</span>') + '</td>';
		}
		html += '</tr></thead><tbody>';
		var daysInMonth = this._getDaysInMonth(drawYear, drawMonth);
		if (drawYear == this._selectedYear && drawMonth == this._selectedMonth) {
		this._selectedDay = Math.min(this._selectedDay, daysInMonth);
		}
		var leadDays = (this._getFirstDayOfMonth(drawYear, drawMonth) - firstDay + 7) % 7;
		var currentDate = (!this._currentDay ? new Date(9999, 9, 9) :
		new Date(this._currentYear, this._currentMonth, this._currentDay));
		var endDate = this._endDay ? new Date(this._endYear, this._endMonth, this._endDay) : currentDate;
		var printDate = new Date(drawYear, drawMonth, 1 - leadDays);
		var numRows = (isMultiMonth ? 6 : Math.ceil((leadDays + daysInMonth) / 7)); // calculate the number of rows to generate
		var beforeShowDay = this._get('beforeShowDay');
		var showOtherMonths = this._get('showOtherMonths');
		var calculateWeek = this._get('calculateWeek') || $.datepicker.iso8601Week;
		var dateStatus = this._get('statusForDate') || $.datepicker.dateStatus;
		for (var dRow = 0; dRow < numRows; dRow++) { // create date picker rows
		html += '<tr class="datepicker_daysRow">' +
			(showWeeks ? '<td class="datepicker_weekCol">' + calculateWeek(printDate) + '</td>' : '');
		for (var dow = 0; dow < 7; dow++) { // create date picker days
			var daySettings = (beforeShowDay ?
			beforeShowDay.apply((this._input ? this._input[0] : null), [printDate]) : [true, '']);
			var otherMonth = (printDate.getMonth() != drawMonth);
			var unselectable = otherMonth || !daySettings[0] ||
			(minDate && printDate < minDate) || (maxDate && printDate > maxDate);
			html += '<td class="datepicker_daysCell' +
			((dow + firstDay + 6) % 7 >= 5 ? ' datepicker_weekEndCell' : '') + // highlight weekends
			(otherMonth ? ' datepicker_otherMonth' : '') + // highlight days from other months
			(printDate.getTime() == selectedDate.getTime() && drawMonth == this._selectedMonth ?
			' datepicker_daysCellOver' : '') + // highlight selected day
			(unselectable ? ' datepicker_unselectable' : '') +  // highlight unselectable days
			(otherMonth && !showOtherMonths ? '' : ' ' + daySettings[1] + // highlight custom dates
			(printDate.getTime() >= currentDate.getTime() && printDate.getTime() <= endDate.getTime() ?  // in current range
			' datepicker_currentDay' : '') + // highlight selected day
			(printDate.getTime() == today.getTime() ? ' datepicker_today' : '')) + '"' + // highlight today (if different)
			(unselectable ? '' : ' onmouseover="jQuery(this).addClass(\'datepicker_daysCellOver\');' +
			(!showStatus || (otherMonth && !showOtherMonths) ? '' : 'jQuery(\'#datepicker_status_' +
			this._id + '\').html(\'' + (dateStatus.apply((this._input ? this._input[0] : null),
			[printDate, this]) || '&#xa0;') +'\');') + '"' +
			' onmouseout="jQuery(this).removeClass(\'datepicker_daysCellOver\');' +
			(!showStatus || (otherMonth && !showOtherMonths) ? '' : 'jQuery(\'#datepicker_status_' +
			this._id + '\').html(\'&#xa0;\');') + '" onclick="jQuery.datepicker._selectDay(' +
			this._id + ',' + drawMonth + ',' + drawYear + ', this);"') + '>' + // actions
			(otherMonth ? (showOtherMonths ? printDate.getDate() : '&#xa0;') : // display for other months
			(unselectable ? printDate.getDate() : '<a>' + printDate.getDate() + '</a>')) + '</td>'; // display for this month
			printDate.setDate(printDate.getDate() + 1);
		}
		html += '</tr>';
		}
		drawMonth++;
		if (drawMonth > 11) {
		drawMonth = 0;
		drawYear++;
		}
		html += '</tbody></table></div>';
	}
	html += (showStatus ? '<div id="datepicker_status_' + this._id + 
	'" class="datepicker_status">' + (this._get('initStatus') || '&#xa0;') + '</div>' : '') +
	(!closeAtTop && !this._inline ? controls : '') +
	'<div style="clear: both;"></div>' + 
	($.browser.msie && parseInt($.browser.version) < 7 && !this._inline ? 
	'<iframe src="javascript:false;" class="datepicker_cover"></iframe>' : '');
	return html;
},

/* Generate the month and year header. */
_generateMonthYearHeader: function(drawMonth, drawYear, minDate, maxDate, selectedDate, secondary) {
	minDate = (this._rangeStart && minDate && selectedDate < minDate ? selectedDate : minDate);
	var showStatus = this._get('showStatus');
	var html = '<div class="datepicker_header">';
	// month selection
	var monthNames = this._get('monthNames');
	if (secondary || !this._get('changeMonth'))
	html += monthNames[drawMonth] + '&#xa0;';
	
	else {
	var inMinYear = (minDate && minDate.getFullYear() == drawYear);
	var inMaxYear = (maxDate && maxDate.getFullYear() == drawYear);
	html += '<select class="datepicker_newMonth" ' +
		'onchange="jQuery.datepicker._selectMonthYear(' + this._id + ', this, \'M\');" ' +
		'onclick="jQuery.datepicker._clickMonthYear(' + this._id + ');"' +
		(showStatus ? this._addStatus(this._get('monthStatus') || '&#xa0;') : '') + '>';
	for (var month = 0; month < 12; month++) {
		if ((!inMinYear || month >= minDate.getMonth()) &&
			(!inMaxYear || month <= maxDate.getMonth())) {
		html += '<option value="' + month + '"' +
			(month == drawMonth ? ' selected="selected"' : '') +
			'>' + monthNames[month] + '</option>';
		}
	}
	html += '</select>';
	}
	// year selection
	if (secondary || !this._get('changeYear'))
	html += drawYear;
	else {
	// determine range of years to display
	var years = this._get('yearRange').split(':');
	var year = 0;
	var endYear = 0;
	if (years.length != 2) {
		year = drawYear - 10;
		endYear = drawYear + 10;
	} else if (years[0].charAt(0) == '+' || years[0].charAt(0) == '-') {
		year = drawYear + parseInt(years[0], 10);
		endYear = drawYear + 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="datepicker_newYear" ' +
		'onchange="jQuery.datepicker._selectMonthYear(' + this._id + ', this, \'Y\');" ' +
		'onclick="jQuery.datepicker._clickMonthYear(' + this._id + ');"' +
		(showStatus ? this._addStatus(this._get('yearStatus') || '&#xa0;') : '') + '>';
	for (; year <= endYear; year++) {
		html += '<option value="' + year + '"' +
		(year == drawYear ? ' selected="selected"' : '') +
		'>' + year + '</option>';
	}
	html += '</select>';
	}
	html += '</div>'; // Close datepicker_header
	return html;
},

/* Provide code to set and clear the status panel. */
_addStatus: function(text) {
	return ' onmouseover="jQuery(\'#datepicker_status_' + this._id + '\').html(\'' + text + '\');" ' +
	'onmouseout="jQuery(\'#datepicker_status_' + this._id + '\').html(\'&#xa0;\');"';
},

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

/* Determine the number of months to show. */
_getNumberOfMonths: function() {
	var numMonths = this._get('numberOfMonths');
	return (numMonths == null ? [1, 1] : (typeof numMonths == 'number' ? [1, numMonths] : numMonths));
},

/* Determine the current maximum date - ensure no time components are set - may be overridden for a range. */
_getMinMaxDate: function(minMax, checkRange) {
	var date = this._determineDate(minMax + 'Date', null);
	if (date) {
	date.setHours(0);
	date.setMinutes(0);
	date.setSeconds(0);
	date.setMilliseconds(0);
	}
	return date || (checkRange ? this._rangeStart : null);
},

/* 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, curYear, curMonth) {
	var numMonths = this._getNumberOfMonths();
	var date = new Date(curYear, curMonth + (offset < 0 ? offset : numMonths[1]), 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) {
	// during range selection, use minimum of selected date and range start
	var newMinDate = (!this._rangeStart ? null :
	new Date(this._selectedYear, this._selectedMonth, this._selectedDay));
	newMinDate = (newMinDate && this._rangeStart < newMinDate ? this._rangeStart : newMinDate);
	var minDate = newMinDate || this._getMinMaxDate('min');
	var maxDate = this._getMinMaxDate('max');
	return ((!minDate || date >= minDate) && (!maxDate || date <= maxDate));
},

/* Provide the configuration settings for formatting/parsing. */
_getFormatConfig: function() {
	var shortYearCutoff = this._get('shortYearCutoff');
	shortYearCutoff = (typeof shortYearCutoff != 'string' ? shortYearCutoff :
	new Date().getFullYear() % 100 + parseInt(shortYearCutoff, 10));
	return {shortYearCutoff: shortYearCutoff,
	dayNamesShort: this._get('dayNamesShort'), dayNames: this._get('dayNames'),
	monthNamesShort: this._get('monthNamesShort'), monthNames: this._get('monthNames')};
},

/* Format the given date for display. */
_formatDate: function(day, month, year) {
	if (!day) {
	this._currentDay = this._selectedDay;
	this._currentMonth = this._selectedMonth;
	this._currentYear = this._selectedYear;
	}
	var date = (day ? (typeof day == 'object' ? day : new Date(year, month, day)) :
	new Date(this._currentYear, this._currentMonth, this._currentDay));
	return $.datepicker.formatDate(this._get('dateFormat'), date, this._getFormatConfig());
}
});

/* 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;
};

/* Invoke the datepicker functionality.
   @param  options  String - a command, optionally followed by additional parameters or
                    Object - settings for attaching new datepicker functionality
   @return  jQuery object */
$.fn.datepicker = function(options){
var otherArgs = Array.prototype.slice.call(arguments, 1);
if (typeof options == 'string' && (options == 'isDisabled' || options == 'getDate')) {
	return $.datepicker['_' + options + 'Datepicker'].apply($.datepicker, [this[0]].concat(otherArgs));
}
return this.each(function() {
	typeof options == 'string' ?
	$.datepicker['_' + options + 'Datepicker'].apply($.datepicker, [this].concat(otherArgs)) :
	$.datepicker._attachDatepicker(this, options);
});
};

/* Initialise the date picker. */
$(document).ready(function() {
$(document.body).append($.datepicker._datepickerDiv)
	.mousedown($.datepicker._checkExternalClick);
});

$.datepicker = new Datepicker(); // singleton instance

})(jQuery);