/* 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: 'mm/dd/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: 'Seleziona la data...', // 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: true, // True if month can be selected directly, false if only prev/next
			changeYear: true, // 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);
			$("#" + input[0].id.replace("_text", "_validator")).addClass("DatePicker");
			$("#" + input[0].id.replace("_text", "_customValidator")).addClass("DatePicker");
			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 buttonImageDisabled = inst._get('buttonImageDisabled');
				var buttonImageStyle = "";
				if (input[0].disabled && buttonImageDisabled != undefined) {
					buttonImage = buttonImageDisabled;
					buttonText = "";
				}
				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.disabled) {
				return false;
			}

			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') {
					try {
						inst._input[0].focus();
					} catch (err) {

					}
				}
				$.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') {
				try {
					inst._input[0].focus();
				} catch (err) {

				}
			}
		},

		/* 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="2"><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"><span>' + calculateWeek(printDate) + '</span></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);