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/*
 * jQuery UI Datepicker @VERSION
 *
 * Copyright (c) 2006, 2007, 2008 Marc Grabanski
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Datepicker
 *
 * Depends:
 *      ui.core.js
 *
 * Marc Grabanski (m@marcgrabanski.com) and Keith Wood (kbwood@virginbroadband.com.au).
 */
   
(function($) { // hide the namespace

var PROP_NAME = 'datepicker';

/* 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,
   allowing multiple different settings on the same page. */

function Datepicker() {
        this.debug = false; // Change this to true to start debugging
        this._curInst = null; // The current instance in use
        this._keyEvent = false; // If the last event was a key event
        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._mainDivId = 'ui-datepicker-div'; // The ID of the main datepicker division
        this._inlineClass = 'ui-datepicker-inline'; // The name of the inline marker class
        this._appendClass = 'ui-datepicker-append'; // The name of the append marker class
        this._triggerClass = 'ui-datepicker-trigger'; // The name of the trigger marker class
        this._dialogClass = 'ui-datepicker-dialog'; // The name of the dialog marker class
        this._promptClass = 'ui-datepicker-prompt'; // The name of the dialog prompt marker class
        this._disableClass = 'ui-datepicker-disabled'; // The name of the disabled covering marker class
        this._unselectableClass = 'ui-datepicker-unselectable'; // The name of the unselectable cell marker class
        this._currentClass = 'ui-datepicker-current-day'; // The name of the current day marker class
        this._dayOverClass = 'ui-datepicker-days-cell-over'; // The name of the day hover marker class
        this._weekOverClass = 'ui-datepicker-week-over'; // The name of the week hover marker class
        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
                prevBigText: '<<', // Display text for previous year link
                prevBigStatus: 'Show the previous year', // Status text for previous year link
                nextText: 'Next>', // Display text for next month link
                nextStatus: 'Show the next month', // Status text for next month link
                nextBigText: '>>', // Display text for next year link
                nextBigStatus: 'Show the next year', // Status text for next year 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
                showOptions: {}, // Options for enhanced animations
                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
                navigationAsDateFormat: false, // True if date formatting applied to prev/today/next links
                showBigPrevNext: false, // True to show big prev/next links
                gotoCurrent: false, // True if today link goes back to current selection instead
                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
                showMonthAfterYear: false, // True if the year select precedes month, false for month then year
                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
                highlightWeek: false, // True to highlight the selected week
                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
                duration: 'normal', // Duration 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 '',
                        // [2] = cell title (optional), 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
                onChangeMonthYear: null, // Define a callback function when the month or year is changed
                onClose: null, // Define a callback function when the datepicker is closed
                numberOfMonths: 1, // Number of months to show at a time
                showCurrentAtPos: 0, // The position in multipe months at which to show the current month (starting at 0)
                stepMonths: 1, // Number of months to step back/forward
                stepBigMonths: 12, // Number of months to step back/forward for the big links
                rangeSelect: false, // Allows for selecting a date range on one date picker
                rangeSeparator: ' - ', // Text between two dates in a range
                altField: '', // Selector for an alternate field to store selected dates into
                altFormat: '', // The date format to use for the alternate field
                constrainInput: true // The input is constrained by the current date format
        };
        $.extend(this._defaults, this.regional['']);
        this.dpDiv = $('<div id="' + this._mainDivId + '" style="display: none;"></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);
        },
        
        /* 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 inline = (nodeName == 'div' || nodeName == 'span');
                if (!target.id)
                        target.id = 'dp' + (++this.uuid);
                var inst = this._newInst($(target), inline);
                inst.settings = $.extend({}, settings || {}, inlineSettings || {}); 
                if (nodeName == 'input') {
                        this._connectDatepicker(target, inst);
                } else if (inline) {
                        this._inlineDatepicker(target, inst);
                }
        },
        
        /* Create a new instance object. */
        _newInst: function(target, inline) {
                var id = target[0].id.replace(/([:\[\]\.])/g, '\\\\$1'); // escape jQuery meta chars
                return {id: id, input: target, // associated target
                        selectedDay: 0, selectedMonth: 0, selectedYear: 0, // current selection
                        drawMonth: 0, drawYear: 0, // month being drawn
                        inline: inline, // is datepicker inline or not
                        dpDiv: (!inline ? this.dpDiv : // presentation div
                        $('<div class="' + this._inlineClass + '"></div>'))};
        },
        
        /* Attach the date picker to an input field. */
        _connectDatepicker: function(target, inst) {
                var input = $(target);
                if (input.hasClass(this.markerClassName))
                        return;
                var appendText = this._get(inst, 'appendText');
                var isRTL = this._get(inst, 'isRTL');
                if (appendText)
                        input[isRTL ? 'before' : 'after']('<span class="' + this._appendClass + '">' + appendText + '</span>');
                var showOn = this._get(inst, '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
                        var buttonText = this._get(inst, 'buttonText');
                        var buttonImage = this._get(inst, 'buttonImage');
                        var trigger = $(this._get(inst, 'buttonImageOnly') ? 
                                $('<img/>').addClass(this._triggerClass).
                                        attr({ src: buttonImage, alt: buttonText, title: buttonText }) :
                                $('<button type="button"></button>').addClass(this._triggerClass).
                                        html(buttonImage == '' ? buttonText : $('<img/>').attr(
                                        { src:buttonImage, alt:buttonText, title:buttonText })));
                        input[isRTL ? 'before' : 'after'](trigger);
                        trigger.click(function() {
                                if ($.datepicker._datepickerShowing && $.datepicker._lastInput == target)
                                        $.datepicker._hideDatepicker();
                                else
                                        $.datepicker._showDatepicker(target);
                                return false;
                        });
                }
                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 this._get(inst, key);
                        });
                $.data(target, PROP_NAME, inst);
        },
        
        /* Attach an inline date picker to a div. */
        _inlineDatepicker: function(target, inst) {
                var divSpan = $(target);
                if (divSpan.hasClass(this.markerClassName))
                        return;
                divSpan.addClass(this.markerClassName).append(inst.dpDiv).
                        bind("setData.datepicker", function(event, key, value){
                                inst.settings[key] = value;
                        }).bind("getData.datepicker", function(event, key){
                                return this._get(inst, key);
                        });
                $.data(target, PROP_NAME, inst);
                this._setDate(inst, this._getDefaultDate(inst));
                this._updateDatepicker(inst);
        },
        
        /* Tidy up after displaying the date picker. */
        _inlineShow: function(inst) {
                var numMonths = this._getNumberOfMonths(inst); // fix width for dynamic number of date pickers
                inst.dpDiv.width(numMonths[1] * $('.ui-datepicker', inst.dpDiv[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) {
                        var id = 'dp' + (++this.uuid);
                        this._dialogInput = $('<input type="text" id="' + id +
                                '" size="1" style="position: absolute; top: -100px;"/>');
                        this._dialogInput.keydown(this._doKeyDown);
                        $('body').append(this._dialogInput);
                        inst = this._dialogInst = this._newInst(this._dialogInput, false);
                        inst.settings = {};
                        $.data(this._dialogInput[0], PROP_NAME, inst);
                }
                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.dpDiv.addClass(this._dialogClass);
                this._showDatepicker(this._dialogInput[0]);
                if ($.blockUI)
                        $.blockUI(this.dpDiv);
                $.data(this._dialogInput[0], PROP_NAME, inst);
                return this;
        },
        
        /* Detach a datepicker from its control.
           @param  target    element - the target input field or division or span */
        _destroyDatepicker: function(target) {
                var $target = $(target);
                if (!$target.hasClass(this.markerClassName)) {
                        return;
                }
                var nodeName = target.nodeName.toLowerCase();
                $.removeData(target, PROP_NAME);
                if (nodeName == 'input') {
                        $target.siblings('.' + this._appendClass).remove().end().
                                siblings('.' + this._triggerClass).remove().end().
                                removeClass(this.markerClassName).
                                unbind('focus', this._showDatepicker).
                                unbind('keydown', this._doKeyDown).
                                unbind('keypress', this._doKeyPress);
                } else if (nodeName == 'div' || nodeName == 'span')
                        $target.removeClass(this.markerClassName).empty();
        },
        
        /* Enable the date picker to a jQuery selection.
           @param  target    element - the target input field or division or span */
        _enableDatepicker: function(target) {
                var $target = $(target);
                if (!$target.hasClass(this.markerClassName)) {
                        return;
                }
                var nodeName = target.nodeName.toLowerCase();
                if (nodeName == 'input') {
                target.disabled = false;
                        $target.siblings('button.' + this._triggerClass).
                        each(function() { this.disabled = false; }).end().
                                siblings('img.' + this._triggerClass).
                                css({opacity: '1.0', cursor: ''});
                }
                else if (nodeName == 'div' || nodeName == 'span') {
                        $target.children('.' + this._disableClass).remove();
                }
                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) {
                var $target = $(target);
                if (!$target.hasClass(this.markerClassName)) {
                        return;
                }
                var nodeName = target.nodeName.toLowerCase();
                if (nodeName == 'input') {
                target.disabled = true;
                        $target.siblings('button.' + this._triggerClass).
                        each(function() { this.disabled = true; }).end().
                                siblings('img.' + this._triggerClass).
                                css({opacity: '0.5', cursor: 'default'});
                }
                else if (nodeName == 'div' || nodeName == 'span') {
                        var inline = $target.children('.' + this._inlineClass);
                        var offset = inline.offset();
                        var relOffset = {left: 0, top: 0};
                        inline.parents().each(function() {
                                if ($(this).css('position') == 'relative') {
                                        relOffset = $(this).offset();
                                        return false;
                                }
                        });
                        $target.prepend('<div class="' + this._disableClass + '" style="' +
                                ($.browser.msie ? 'background-color: transparent; ' : '') +
                                'width: ' + inline.width() + 'px; height: ' + inline.height() +
                                'px; left: ' + (offset.left - relOffset.left) +
                                'px; top: ' + (offset.top - relOffset.top) + 'px;"></div>');
                }
                this._disabledInputs = $.map(this._disabledInputs,
                        function(value) { return (value == target ? null : value); }); // delete entry
                this._disabledInputs[this._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;
        },
        
        /* Retrieve the instance data for the target control.
           @param  target  element - the target input field or division or span
           @return  object - the associated instance data
           @throws  error if a jQuery problem getting data */
        _getInst: function(target) {
                try {
                        return $.data(target, PROP_NAME);
                }
                catch (err) {
                        throw 'Missing instance data for this datepicker';
                }
        },
        
        /* 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    object - the new settings to update or
                           string - the name of the setting to change or
           @param  value   any - the new value for the setting (omit if above is an object) */
        _optionDatepicker: function(target, name, value) {
                var settings = name || {};
                if (typeof name == 'string') {
                        settings = {};
                        settings[name] = value;
                }
                var inst = this._getInst(target);
                if (inst) {
                        if (this._curInst == inst) {
                                this._hideDatepicker(null);
                        }
                        extendRemove(inst.settings, settings);
                        var date = new Date();
                        extendRemove(inst, {rangeStart: null, // start of range
                                endDay: null, endMonth: null, endYear: null, // end of range
                                selectedDay: date.getDate(), selectedMonth: date.getMonth(),
                                selectedYear: date.getFullYear(), // starting point
                                currentDay: date.getDate(), currentMonth: date.getMonth(),
                                currentYear: date.getFullYear(), // current selection
                                drawMonth: date.getMonth(), drawYear: date.getFullYear()}); // month being drawn
                        this._updateDatepicker(inst);
                }
        },
        
        // change method deprecated
        _changeDatepicker: function(target, name, value) {
                this._optionDatepicker(target, name, value);
        },
        
        /* Redraw the date picker attached to an input field or division.
           @param  target  element - the target input field or division or span */
        _refreshDatepicker: function(target) {
                var inst = this._getInst(target);
                if (inst) {
                        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) {
                var inst = this._getInst(target);
                if (inst) {
                        this._setDate(inst, date, endDate);
                        this._updateDatepicker(inst);
                        this._updateAlternate(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);
                if (inst && !inst.inline)
                        this._setDateFromField(inst); 
                return (inst ? this._getDate(inst) : null);
        },
        
        /* Handle keystrokes. */
        _doKeyDown: function(e) {
                var inst = $.datepicker._getInst(e.target);
                var handled = true;
                inst._keyEvent = true;
                if ($.datepicker._datepickerShowing)
                        switch (e.keyCode) {
                                case 9:  $.datepicker._hideDatepicker(null, '');
                                                break; // hide on tab out
                                case 13: var sel = $('td.' + $.datepicker._dayOverClass +
                                                        ', td.' + $.datepicker._currentClass, inst.dpDiv);
                                                if (sel[0])
                                                        $.datepicker._selectDay(e.target, inst.selectedMonth, inst.selectedYear, sel[0]);
                                                else
                                                        $.datepicker._hideDatepicker(null, $.datepicker._get(inst, 'duration'));
                                                return false; // don't submit the form
                                                break; // select the value on enter
                                case 27: $.datepicker._hideDatepicker(null, $.datepicker._get(inst, 'duration'));
                                                break; // hide on escape
                                case 33: $.datepicker._adjustDate(e.target, (e.ctrlKey ?
                                                        -$.datepicker._get(inst, 'stepBigMonths') :
                                                        -$.datepicker._get(inst, 'stepMonths')), 'M');
                                                break; // previous month/year on page up/+ ctrl
                                case 34: $.datepicker._adjustDate(e.target, (e.ctrlKey ?
                                                        +$.datepicker._get(inst, 'stepBigMonths') :
                                                        +$.datepicker._get(inst, 'stepMonths')), 'M');
                                                break; // next month/year on page down/+ ctrl
                                case 35: if (e.ctrlKey || e.metaKey) $.datepicker._clearDate(e.target);
                                                handled = e.ctrlKey || e.metaKey;
                                                break; // clear on ctrl or command +end 
                                case 36: if (e.ctrlKey || e.metaKey) $.datepicker._gotoToday(e.target);
                                                handled = e.ctrlKey || e.metaKey;
                                                break; // current on ctrl or command +home
                                case 37: if (e.ctrlKey || e.metaKey) $.datepicker._adjustDate(e.target, -1, 'D');
                                                handled = e.ctrlKey || e.metaKey;
                                                // -1 day on ctrl or command +left
                                                if (e.originalEvent.altKey) $.datepicker._adjustDate(e.target, (e.ctrlKey ?
                                                                        -$.datepicker._get(inst, 'stepBigMonths') :
                                                                        -$.datepicker._get(inst, 'stepMonths')), 'M');
                                                // next month/year on alt +left on Mac
                                                break; 
                                case 38: if (e.ctrlKey || e.metaKey) $.datepicker._adjustDate(e.target, -7, 'D');
                                                handled = e.ctrlKey || e.metaKey;
                                                break; // -1 week on ctrl or command +up
                                case 39: if (e.ctrlKey || e.metaKey) $.datepicker._adjustDate(e.target, +1, 'D');
                                                handled = e.ctrlKey || e.metaKey;
                                                // +1 day on ctrl or command +right
                                                if (e.originalEvent.altKey) $.datepicker._adjustDate(e.target, (e.ctrlKey ?
                                                                        +$.datepicker._get(inst, 'stepBigMonths') :
                                                                        +$.datepicker._get(inst, 'stepMonths')), 'M');
                                                // next month/year on alt +right
                                                break; 
                                case 40: if (e.ctrlKey || e.metaKey) $.datepicker._adjustDate(e.target, +7, 'D');
                                                handled = e.ctrlKey || e.metaKey;
                                                break; // +1 week on ctrl or command +down
                                default: handled = false;
                        }
                else if (e.keyCode == 36 && e.ctrlKey) // display the date picker on ctrl+home
                        $.datepicker._showDatepicker(this);
                else {
                        handled = false;
                }
                if (handled) {
                        e.preventDefault();
                        e.stopPropagation();
                }
        },
        
        /* Filter entered characters - based on date format. */
        _doKeyPress: function(e) {
                var inst = $.datepicker._getInst(e.target);
                if ($.datepicker._get(inst, 'constrainInput')) {
                        var chars = $.datepicker._possibleChars($.datepicker._get(inst, 'dateFormat'));
                        var chr = String.fromCharCode(e.charCode == undefined ? e.keyCode : e.charCode);
                        return e.ctrlKey || (chr < ' ' || !chars || chars.indexOf(chr) > -1);
                }
        },
        
        /* 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);
                var beforeShow = $.datepicker._get(inst, 'beforeShow');
                extendRemove(inst.settings, (beforeShow ? beforeShow.apply(input, [input, inst]) : {}));
                $.datepicker._hideDatepicker(null, '');
                $.datepicker._lastInput = input;
                $.datepicker._setDateFromField(inst);
                if ($.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';
                        return !isFixed;
                });
                if (isFixed && $.browser.opera) { // correction for Opera when fixed and scrolled
                        $.datepicker._pos[0] -= document.documentElement.scrollLeft;
                        $.datepicker._pos[1] -= document.documentElement.scrollTop;
                }
                var offset = {left: $.datepicker._pos[0], top: $.datepicker._pos[1]};
                $.datepicker._pos = null;
                inst.rangeStart = null;
                // determine sizing offscreen
                inst.dpDiv.css({position: 'absolute', display: 'block', top: '-1000px'});
                $.datepicker._updateDatepicker(inst);
                // fix width for dynamic number of date pickers
                inst.dpDiv.width($.datepicker._getNumberOfMonths(inst)[1] *
                        $('.ui-datepicker', inst.dpDiv[0])[0].offsetWidth);
                // and adjust position before showing
                offset = $.datepicker._checkOffset(inst, offset, isFixed);
                inst.dpDiv.css({position: ($.datepicker._inDialog && $.blockUI ?
                        'static' : (isFixed ? 'fixed' : 'absolute')), display: 'none',
                        left: offset.left + 'px', top: offset.top + 'px'});
                if (!inst.inline) {
                        var showAnim = $.datepicker._get(inst, 'showAnim') || 'show';
                        var duration = $.datepicker._get(inst, 'duration');
                        var postProcess = function() {
                                $.datepicker._datepickerShowing = true;
                                if ($.browser.msie && parseInt($.browser.version,10) < 7) // fix IE < 7 select problems
                                        $('iframe.ui-datepicker-cover').css({width: inst.dpDiv.width() + 4,
                                                height: inst.dpDiv.height() + 4});
                        };
                        if ($.effects && $.effects[showAnim])
                                inst.dpDiv.show(showAnim, $.datepicker._get(inst, 'showOptions'), duration, postProcess);
                        else
                                inst.dpDiv[showAnim](duration, postProcess);
                        if (duration == '')
                                postProcess();
                        if (inst.input[0].type != 'hidden')
                                inst.input[0].focus();
                        $.datepicker._curInst = inst;
                }
        },
        
        /* Generate the date picker content. */
        _updateDatepicker: function(inst) {
                var dims = {width: inst.dpDiv.width() + 4,
                        height: inst.dpDiv.height() + 4};
                inst.dpDiv.empty().append(this._generateHTML(inst)).
                        find('iframe.ui-datepicker-cover').
                        css({width: dims.width, height: dims.height});
                var numMonths = this._getNumberOfMonths(inst);
                inst.dpDiv[(numMonths[0] != 1 || numMonths[1] != 1 ? 'add' : 'remove') +
                        'Class']('ui-datepicker-multi');
                inst.dpDiv[(this._get(inst, 'isRTL') ? 'add' : 'remove') +
                        'Class']('ui-datepicker-rtl');
                if (inst.input && inst.input[0].type != 'hidden' && inst == $.datepicker._curInst)
                        $(inst.input[0]).focus();
        },
        
        /* Check positioning to remain on screen. */
        _checkOffset: function(inst, offset, isFixed) {
                var pos = inst.input ? this._findPos(inst.input[0]) : null;
                var browserWidth = window.innerWidth || (document.documentElement ?
                        document.documentElement.clientWidth : document.body.clientWidth); 
                var browserHeight = window.innerHeight || (document.documentElement ?
                        document.documentElement.clientHeight : document.body.clientHeight);
                var scrollX = document.documentElement.scrollLeft || document.body.scrollLeft;
                var scrollY = document.documentElement.scrollTop || document.body.scrollTop;
                // reposition date picker horizontally if outside the browser window
                if (this._get(inst, 'isRTL') || (offset.left + inst.dpDiv.width() - scrollX) > browserWidth)
                        offset.left = Math.max((isFixed ? 0 : scrollX),
                                pos[0] + (inst.input ? inst.input.width() : 0) - (isFixed ? scrollX : 0) - inst.dpDiv.width() -
                                (isFixed && $.browser.opera ? document.documentElement.scrollLeft : 0));
                else
                        offset.left -= (isFixed ? scrollX : 0);
                // reposition date picker vertically if outside the browser window
                if ((offset.top + inst.dpDiv.height() - scrollY) > browserHeight)
                        offset.top = Math.max((isFixed ? 0 : scrollY),
                                pos[1] - (isFixed ? scrollY : 0) - (this._inDialog ? 0 : inst.dpDiv.height()) -
                                (isFixed && $.browser.opera ? document.documentElement.scrollTop : 0));
                else
                        offset.top -= (isFixed ? scrollY : 0);
                return offset;
        },
        
        /* 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  duration  string - the duration over which to close the date picker */
        _hideDatepicker: function(input, duration) {
                var inst = this._curInst;
                if (!inst || (input && inst != $.data(input, PROP_NAME)))
                        return;
                var rangeSelect = this._get(inst, 'rangeSelect');
                if (rangeSelect && inst.stayOpen)
                        this._selectDate('#' + inst.id, this._formatDate(inst,
                                inst.currentDay, inst.currentMonth, inst.currentYear));
                inst.stayOpen = false;
                if (this._datepickerShowing) {
                        duration = (duration != null ? duration : this._get(inst, 'duration'));
                        var showAnim = this._get(inst, 'showAnim');
                        var postProcess = function() {
                                $.datepicker._tidyDialog(inst);
                        };
                        if (duration != '' && $.effects && $.effects[showAnim])
                                inst.dpDiv.hide(showAnim, $.datepicker._get(inst, 'showOptions'),
                                        duration, postProcess);
                        else
                                inst.dpDiv[(duration == '' ? 'hide' : (showAnim == 'slideDown' ? 'slideUp' :
                                        (showAnim == 'fadeIn' ? 'fadeOut' : 'hide')))](duration, postProcess);
                        if (duration == '')
                                this._tidyDialog(inst);
                        var onClose = this._get(inst, 'onClose');
                        if (onClose)
                                onClose.apply((inst.input ? inst.input[0] : null),
                                        [(inst.input ? inst.input.val() : ''), inst]);  // trigger custom callback
                        this._datepickerShowing = false;
                        this._lastInput = null;
                        inst.settings.prompt = null;
                        if (this._inDialog) {
                                this._dialogInput.css({ position: 'absolute', left: '0', top: '-100px' });
                                if ($.blockUI) {
                                        $.unblockUI();
                                        $('body').append(this.dpDiv);
                                }
                        }
                        this._inDialog = false;
                }
                this._curInst = null;
        },
        
        /* Tidy up after a dialog display. */
        _tidyDialog: function(inst) {
                inst.dpDiv.removeClass(this._dialogClass).unbind('.ui-datepicker');
                $('.' + this._promptClass, inst.dpDiv).remove();
        },
        
        /* Close date picker if clicked elsewhere. */
        _checkExternalClick: function(event) {
                if (!$.datepicker._curInst)
                        return;
                var $target = $(event.target);
                if (($target.parents('#' + $.datepicker._mainDivId).length == 0) &&
                                !$target.hasClass($.datepicker.markerClassName) &&
                                !$target.hasClass($.datepicker._triggerClass) &&
                                $.datepicker._datepickerShowing && !($.datepicker._inDialog && $.blockUI))
                        $.datepicker._hideDatepicker(null, '');
        },
        
        /* Adjust one of the date sub-fields. */
        _adjustDate: function(id, offset, period) {
                var target = $(id);
                var inst = this._getInst(target[0]);
                this._adjustInstDate(inst, offset, period);
                this._updateDatepicker(inst);
        },
        
        /* Action for current link. */
        _gotoToday: function(id) {
                var target = $(id);
                var inst = this._getInst(target[0]);
                if (this._get(inst, 'gotoCurrent') && inst.currentDay) {
                        inst.selectedDay = inst.currentDay;
                        inst.drawMonth = inst.selectedMonth = inst.currentMonth;
                        inst.drawYear = inst.selectedYear = inst.currentYear;
                }
                else {
                var date = new Date();
                inst.selectedDay = date.getDate();
                inst.drawMonth = inst.selectedMonth = date.getMonth();
                inst.drawYear = inst.selectedYear = date.getFullYear();
                }
                this._notifyChange(inst);
                this._adjustDate(target);
        },
        
        /* Action for selecting a new month/year. */
        _selectMonthYear: function(id, select, period) {
                var target = $(id);
                var inst = this._getInst(target[0]);
                inst._selectingMonthYear = false;
                inst['selected' + (period == 'M' ? 'Month' : 'Year')] =
                inst['draw' + (period == 'M' ? 'Month' : 'Year')] =
                        parseInt(select.options[select.selectedIndex].value,10);
                this._notifyChange(inst);
                this._adjustDate(target);
        },
        
        /* Restore input focus after not changing month/year. */
        _clickMonthYear: function(id) {
                var target = $(id);
                var inst = this._getInst(target[0]);
                if (inst.input && inst._selectingMonthYear && !$.browser.msie)
                        inst.input[0].focus();
                inst._selectingMonthYear = !inst._selectingMonthYear;
        },
        
        /* Action for changing the first week day. */
        _changeFirstDay: function(id, day) {
                var target = $(id);
                var inst = this._getInst(target[0]);
                inst.settings.firstDay = day;
                this._updateDatepicker(inst);
        },
        
        /* Action for selecting a day. */
        _selectDay: function(id, month, year, td) {
                if ($(td).hasClass(this._unselectableClass))
                        return;
                var target = $(id);
                var inst = this._getInst(target[0]);
                var rangeSelect = this._get(inst, 'rangeSelect');
                if (rangeSelect) {
                        inst.stayOpen = !inst.stayOpen;
                        if (inst.stayOpen) {
                                $('.ui-datepicker td', inst.dpDiv).removeClass(this._currentClass);
                                $(td).addClass(this._currentClass);
                        } 
                }
                inst.selectedDay = inst.currentDay = $('a', td).html();
                inst.selectedMonth = inst.currentMonth = month;
                inst.selectedYear = inst.currentYear = year;
                if (inst.stayOpen) {
                        inst.endDay = inst.endMonth = inst.endYear = null;
                }
                else if (rangeSelect) {
                        inst.endDay = inst.currentDay;
                        inst.endMonth = inst.currentMonth;
                        inst.endYear = inst.currentYear;
                }
                this._selectDate(id, this._formatDate(inst,
                        inst.currentDay, inst.currentMonth, inst.currentYear));
                if (inst.stayOpen) {
                        inst.rangeStart = new Date(inst.currentYear, inst.currentMonth, inst.currentDay);
                        this._updateDatepicker(inst);
                }
                else if (rangeSelect) {
                        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 target = $(id);
                var inst = this._getInst(target[0]);
                if (this._get(inst, 'mandatory'))
                        return;
                inst.stayOpen = false;
                inst.endDay = inst.endMonth = inst.endYear = inst.rangeStart = null;
                this._selectDate(target, '');
        },
        
        /* Update the input field with the selected date. */
        _selectDate: function(id, dateStr) {
                var target = $(id);
                var inst = this._getInst(target[0]);
                dateStr = (dateStr != null ? dateStr : this._formatDate(inst));
                if (this._get(inst, 'rangeSelect') && dateStr)
                        dateStr = (inst.rangeStart ? this._formatDate(inst, inst.rangeStart) :
                                dateStr) + this._get(inst, 'rangeSeparator') + dateStr;
                if (inst.input)
                        inst.input.val(dateStr);
                this._updateAlternate(inst);
                var onSelect = this._get(inst, '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 (!inst.stayOpen) {
                        this._hideDatepicker(null, this._get(inst, 'duration'));
                        this._lastInput = inst.input[0];
                        if (typeof(inst.input[0]) != 'object')
                                inst.input[0].focus(); // restore focus
                        this._lastInput = null;
                }
        },
        
        /* Update any alternate field to synchronise with the main field. */
        _updateAlternate: function(inst) {
                var altField = this._get(inst, 'altField');
                if (altField) { // update alternate field too
                        var altFormat = this._get(inst, 'altFormat');
                        var date = this._getDate(inst);
                        dateStr = (isArray(date) ? (!date[0] && !date[1] ? '' :
                                this.formatDate(altFormat, date[0], this._getFormatConfig(inst)) +
                                this._get(inst, 'rangeSeparator') + this.formatDate(
                                altFormat, date[1] || date[0], this._getFormatConfig(inst))) :
                                this.formatDate(altFormat, date, this._getFormatConfig(inst)));
                        $(altField).each(function() { $(this).val(dateStr); });
                }
        },
        
        /* 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
                                return 1;
                        }
                }
                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 $.datepicker.formatDate($.datepicker._get(inst, 'dateStatus'),
                        date, $.datepicker._getFormatConfig(inst));
        },
        
        /* Parse a string value into a date object.
           See formatDate below for the possible formats.

           @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 doy = -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 origSize = (match == '@' ? 14 : (match == 'y' ? 4 : (match == 'o' ? 3 : 2)));
                        var size = origSize;
                        var num = 0;
                        while (size > 0 && iValue < value.length &&
                                        value.charAt(iValue) >= '0' && value.charAt(iValue) <= '9') {
                                num = num * 10 + parseInt(value.charAt(iValue++),10);
                                size--;
                        }
                        if (size == origSize)
                                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 'o':
                                                doy = getNumber('o');
                                                break;
                                        case 'm': 
                                                month = getNumber('m');
                                                break;
                                        case 'M':
                                                month = getName('M', monthNamesShort, monthNames); 
                                                break;
                                        case 'y':
                                                year = getNumber('y');
                                                break;
                                        case '@':
                                                var date = new Date(getNumber('@'));
                                                year = date.getFullYear();
                                                month = date.getMonth() + 1;
                                                day = date.getDate();
                                                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);
                if (doy > -1) {
                        month = 1;
                        day = doy;
                        do {
                                var dim = this._getDaysInMonth(year, month - 1);
                                if (day <= dim)
                                        break;
                                month++;
                                day -= dim;
                        } while (true);
                }
                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;
        },
        
        /* Standard date formats. */
        ATOM: 'yy-mm-dd', // RFC 3339 (ISO 8601)
        COOKIE: 'D, dd M yy',
        ISO_8601: 'yy-mm-dd',
        RFC_822: 'D, d M y',
        RFC_850: 'DD, dd-M-y',
        RFC_1036: 'D, d M y',
        RFC_1123: 'D, d M yy',
        RFC_2822: 'D, d M yy',
        RSS: 'D, d M y', // RFC 822
        TIMESTAMP: '@',
        W3C: 'yy-mm-dd', // ISO 8601
        
        /* 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)
           o  - day of year (no leading zeros)
           oo - day of year (three 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)
           @ - Unix timestamp (ms since 01/01/1970)
           '...' - 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, len) {
                        var num = '' + value;
                        if (lookAhead(match))
                                while (num.length < len)
                                        num = '0' + num;
                        return num;
                };
                // 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(), 2);
                                                        break;
                                                case 'D': 
                                                        output += formatName('D', date.getDay(), dayNamesShort, dayNames);
                                                        break;
                                                case 'o':
                                                        var doy = date.getDate();
                                                        for (var m = date.getMonth() - 1; m >= 0; m--)
                                                                doy += this._getDaysInMonth(date.getFullYear(), m);
                                                        output += formatNumber('o', doy, 3);
                                                        break;
                                                case 'm': 
                                                        output += formatNumber('m', date.getMonth() + 1, 2);
                                                        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 '@':
                                                        output += date.getTime(); 
                                                        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': case 'm': case 'y': case '@':
                                                chars += '0123456789'; 
                                                break;
                                        case 'D': case 'M':
                                                return null; // Accept anything
                                        case "'":
                                                if (lookAhead("'"))
                                                        chars += "'";
                                                else
                                                        literal = true;
                                                break;
                                        default:
                                                chars += format.charAt(iFormat);
                                }
                return chars;
        },
        
        /* Get a setting value, defaulting if necessary. */
        _get: function(inst, name) {
                return inst.settings[name] !== undefined ?
                        inst.settings[name] : this._defaults[name];
        },
        
        /* Parse existing date and initialise date picker. */
        _setDateFromField: function(inst) {
                var dateFormat = this._get(inst, 'dateFormat');
                var dates = inst.input ? inst.input.val().split(this._get(inst, 'rangeSeparator')) : null; 
                inst.endDay = inst.endMonth = inst.endYear = null;
                var date = defaultDate = this._getDefaultDate(inst);
                if (dates.length > 0) {
                        var settings = this._getFormatConfig(inst);
                        if (dates.length > 1) {
                                date = this.parseDate(dateFormat, dates[1], settings) || defaultDate;
                                inst.endDay = date.getDate();
                                inst.endMonth = date.getMonth();
                                inst.endYear = date.getFullYear();
                        }
                        try {
                                date = this.parseDate(dateFormat, dates[0], settings) || defaultDate;
                        } catch (e) {
                                this.log(e);
                                date = defaultDate;
                        }
                }
                inst.selectedDay = date.getDate();
                inst.drawMonth = inst.selectedMonth = date.getMonth();
                inst.drawYear = inst.selectedYear = date.getFullYear();
                inst.currentDay = (dates[0] ? date.getDate() : 0);
                inst.currentMonth = (dates[0] ? date.getMonth() : 0);
                inst.currentYear = (dates[0] ? date.getFullYear() : 0);
                this._adjustInstDate(inst);
        },
        
        /* Retrieve the default date shown on opening. */
        _getDefaultDate: function(inst) {
                var date = this._determineDate(this._get(inst, 'defaultDate'), new Date());
                var minDate = this._getMinMaxDate(inst, 'min', true);
                var maxDate = this._getMinMaxDate(inst, '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(date, defaultDate) {
                var offsetNumeric = function(offset) {
                        var date = new Date();
                        date.setUTCDate(date.getUTCDate() + offset);
                        return date;
                };
                var offsetString = function(offset, getDaysInMonth) {
                        var date = new Date();
                        var year = date.getFullYear();
                        var month = date.getMonth();
                        var day = date.getDate();
                        var pattern = /([+-]?[0-9]+)\s*(d|D|w|W|m|M|y|Y)?/g;
                        var matches = pattern.exec(offset);
                        while (matches) {
                                switch (matches[2] || 'd') {
                                        case 'd' : case 'D' :
                                                day += parseInt(matches[1],10); break;
                                        case 'w' : case 'W' :
                                                day += parseInt(matches[1],10) * 7; break;
                                        case 'm' : case 'M' :
                                                month += parseInt(matches[1],10); 
                                                day = Math.min(day, getDaysInMonth(year, month));
                                                break;
                                        case 'y': case 'Y' :
                                                year += parseInt(matches[1],10);
                                                day = Math.min(day, getDaysInMonth(year, month));
                                                break;
                                }
                                matches = pattern.exec(offset);
                        }
                        return new Date(year, month, day);
                };
                date = (date == null ? defaultDate :
                        (typeof date == 'string' ? offsetString(date, this._getDaysInMonth) :
                        (typeof date == 'number' ? (isNaN(date) ? defaultDate : offsetNumeric(date)) : date)));
                date = (date && date.toString() == 'Invalid Date' ? defaultDate : date);
                if (date) {
                        date.setHours(0);
                        date.setMinutes(0);
                        date.setSeconds(0);
                        date.setMilliseconds(0);
                }
                return date;
        },
        
        /* Set the date(s) directly. */
        _setDate: function(inst, date, endDate) {
                var clear = !(date);
                var origMonth = inst.selectedMonth;
                var origYear = inst.selectedYear;
                date = this._determineDate(date, new Date());
                inst.selectedDay = inst.currentDay = date.getDate();
                inst.drawMonth = inst.selectedMonth = inst.currentMonth = date.getMonth();
                inst.drawYear = inst.selectedYear = inst.currentYear = date.getFullYear();
                if (this._get(inst, 'rangeSelect')) {
                        if (endDate) {
                                endDate = this._determineDate(endDate, null);
                                inst.endDay = endDate.getDate();
                                inst.endMonth = endDate.getMonth();
                                inst.endYear = endDate.getFullYear();
                        } else {
                                inst.endDay = inst.currentDay;
                                inst.endMonth = inst.currentMonth;
                                inst.endYear = inst.currentYear;
                        }
                }
                if (origMonth != inst.selectedMonth || origYear != inst.selectedYear)
                        this._notifyChange(inst);
                this._adjustInstDate(inst);
                if (inst.input)
                        inst.input.val(clear ? '' : this._formatDate(inst) +
                                (!this._get(inst, 'rangeSelect') ? '' : this._get(inst, 'rangeSeparator') +
                                this._formatDate(inst, inst.endDay, inst.endMonth, inst.endYear)));
        },
        
        /* Retrieve the date(s) directly. */
        _getDate: function(inst) {
                var startDate = (!inst.currentYear || (inst.input && inst.input.val() == '') ? null :
                        new Date(inst.currentYear, inst.currentMonth, inst.currentDay));
                if (this._get(inst, 'rangeSelect')) {
                        return [inst.rangeStart || startDate,
                                (!inst.endYear ? inst.rangeStart || startDate :
                                new Date(inst.endYear, inst.endMonth, inst.endDay))];
                } else
                        return startDate;
        },
        
        /* Generate the HTML for the current state of the date picker. */
        _generateHTML: function(inst) {
                var today = new Date();
                today = new Date(today.getFullYear(), today.getMonth(), today.getDate()); // clear time
                var showStatus = this._get(inst, 'showStatus');
                var initStatus = this._get(inst, 'initStatus') || '&#xa0;';
                var isRTL = this._get(inst, 'isRTL');
                // build the date picker HTML
                var clear = (this._get(inst, 'mandatory') ? '' :
                        '<div class="ui-datepicker-clear"><a onclick="jQuery.datepicker._clearDate(\'#' + inst.id + '\');"' +
                        this._addStatus(showStatus, inst.id, this._get(inst, 'clearStatus'), initStatus) + '>' +
                        this._get(inst, 'clearText') + '</a></div>');
                var controls = '<div class="ui-datepicker-control">' + (isRTL ? '' : clear) +
                        '<div class="ui-datepicker-close"><a onclick="jQuery.datepicker._hideDatepicker();"' +
                        this._addStatus(showStatus, inst.id, this._get(inst, 'closeStatus'), initStatus) + '>' +
                        this._get(inst, 'closeText') + '</a></div>' + (isRTL ? clear : '')  + '</div>';
                var prompt = this._get(inst, 'prompt');
                var closeAtTop = this._get(inst, 'closeAtTop');
                var hideIfNoPrevNext = this._get(inst, 'hideIfNoPrevNext');
                var navigationAsDateFormat = this._get(inst, 'navigationAsDateFormat');
                var showBigPrevNext = this._get(inst, 'showBigPrevNext');
                var numMonths = this._getNumberOfMonths(inst);
                var showCurrentAtPos = this._get(inst, 'showCurrentAtPos');
                var stepMonths = this._get(inst, 'stepMonths');
                var stepBigMonths = this._get(inst, 'stepBigMonths');
                var isMultiMonth = (numMonths[0] != 1 || numMonths[1] != 1);
                var currentDate = (!inst.currentDay ? new Date(9999, 9, 9) :
                        new Date(inst.currentYear, inst.currentMonth, inst.currentDay));
                var minDate = this._getMinMaxDate(inst, 'min', true);
                var maxDate = this._getMinMaxDate(inst, 'max');
                var drawMonth = inst.drawMonth - showCurrentAtPos;
                var drawYear = inst.drawYear;
                if (drawMonth < 0) {
                        drawMonth += 12;
                        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 prevText = this._get(inst, 'prevText');
                prevText = (!navigationAsDateFormat ? prevText : this.formatDate(
                        prevText, new Date(drawYear, drawMonth - stepMonths, 1), this._getFormatConfig(inst)));
                var prevBigText = (showBigPrevNext ? this._get(inst, 'prevBigText') : '');
                prevBigText = (!navigationAsDateFormat ? prevBigText : this.formatDate(
                        prevBigText, new Date(drawYear, drawMonth - stepBigMonths, 1), this._getFormatConfig(inst)));
                var prev = '<div class="ui-datepicker-prev">' + (this._canAdjustMonth(inst, -1, drawYear, drawMonth) ? 
                        (showBigPrevNext ? '<a onclick="jQuery.datepicker._adjustDate(\'#' + inst.id + '\', -' + stepBigMonths + ', \'M\');"' +
                        this._addStatus(showStatus, inst.id, this._get(inst, 'prevBigStatus'), initStatus) + '>' + prevBigText + '</a>' : '') +
                        '<a onclick="jQuery.datepicker._adjustDate(\'#' + inst.id + '\', -' + stepMonths + ', \'M\');"' +
                        this._addStatus(showStatus, inst.id, this._get(inst, 'prevStatus'), initStatus) + '>' + prevText + '</a>' :
                        (hideIfNoPrevNext ? '' : '<label>' + prevBigText + '</label><label>' + prevText + '</label>')) + '</div>';
                var nextText = this._get(inst, 'nextText');
                nextText = (!navigationAsDateFormat ? nextText : this.formatDate(
                        nextText, new Date(drawYear, drawMonth + stepMonths, 1), this._getFormatConfig(inst)));
                var nextBigText = (showBigPrevNext ? this._get(inst, 'nextBigText') : '');
                nextBigText = (!navigationAsDateFormat ? nextBigText : this.formatDate(
                        nextBigText, new Date(drawYear, drawMonth + stepBigMonths, 1), this._getFormatConfig(inst)));
                var next = '<div class="ui-datepicker-next">' + (this._canAdjustMonth(inst, +1, drawYear, drawMonth) ?
                        '<a onclick="jQuery.datepicker._adjustDate(\'#' + inst.id + '\', +' + stepMonths + ', \'M\');"' +
                        this._addStatus(showStatus, inst.id, this._get(inst, 'nextStatus'), initStatus) + '>' + nextText + '</a>' +
                        (showBigPrevNext ? '<a onclick="jQuery.datepicker._adjustDate(\'#' + inst.id + '\', +' + stepBigMonths + ', \'M\');"' +
                        this._addStatus(showStatus, inst.id, this._get(inst, 'nextBigStatus'), initStatus) + '>' + nextBigText + '</a>' : '') :
                        (hideIfNoPrevNext ? '' : '<label>' + nextText + '</label><label>' + nextBigText + '</label>')) + '</div>';
                var currentText = this._get(inst, 'currentText');
                var gotoDate = (this._get(inst, 'gotoCurrent') && inst.currentDay ? currentDate : today); 
                currentText = (!navigationAsDateFormat ? currentText :
                        this.formatDate(currentText, gotoDate, this._getFormatConfig(inst)));
                var html = (prompt ? '<div class="' + this._promptClass + '">' + prompt + '</div>' : '') +
                        (closeAtTop && !inst.inline ? controls : '') +
                        '<div class="ui-datepicker-links">' + (isRTL ? next : prev) +
                        (this._isInRange(inst, gotoDate) ? '<div class="ui-datepicker-current">' +
                        '<a onclick="jQuery.datepicker._gotoToday(\'#' + inst.id + '\');"' +
                        this._addStatus(showStatus, inst.id, this._get(inst, 'currentStatus'), initStatus) + '>' +
                        currentText + '</a></div>' : '') + (isRTL ? prev : next) + '</div>';
                var firstDay = this._get(inst, 'firstDay');
                var changeFirstDay = this._get(inst, 'changeFirstDay');
                var dayNames = this._get(inst, 'dayNames');
                var dayNamesShort = this._get(inst, 'dayNamesShort');
                var dayNamesMin = this._get(inst, 'dayNamesMin');
                var monthNames = this._get(inst, 'monthNames');
                var beforeShowDay = this._get(inst, 'beforeShowDay');
                var highlightWeek = this._get(inst, 'highlightWeek');
                var showOtherMonths = this._get(inst, 'showOtherMonths');
                var showWeeks = this._get(inst, 'showWeeks');
                var calculateWeek = this._get(inst, 'calculateWeek') || this.iso8601Week;
                var weekStatus = this._get(inst, 'weekStatus');
                var status = (showStatus ? this._get(inst, 'dayStatus') || initStatus : '');
                var dateStatus = this._get(inst, 'statusForDate') || this.dateStatus;
                var endDate = inst.endDay ? new Date(inst.endYear, inst.endMonth, inst.endDay) : currentDate;
                var defaultDate = this._getDefaultDate(inst);
                for (var row = 0; row < numMonths[0]; row++)
                        for (var col = 0; col < numMonths[1]; col++) {
                                var selectedDate = new Date(drawYear, drawMonth, inst.selectedDay);
                                html += '<div class="ui-datepicker-one-month' + (col == 0 ? ' ui-datepicker-new-row' : '') + '">' +
                                        this._generateMonthYearHeader(inst, drawMonth, drawYear, minDate, maxDate,
                                        selectedDate, row > 0 || col > 0, showStatus, initStatus, monthNames) + // draw month headers
                                        '<table class="ui-datepicker" cellpadding="0" cellspacing="0"><thead>' + 
                                        '<tr class="ui-datepicker-title-row">' +
                                        (showWeeks ? '<td' + this._addStatus(showStatus, inst.id, weekStatus, initStatus) + '>' +
                                        this._get(inst, 'weekHeader') + '</td>' : '');
                                for (var dow = 0; dow < 7; dow++) { // days of the week
                                        var day = (dow + firstDay) % 7;
                                        var dayStatus = (status.indexOf('DD') > -1 ? status.replace(/DD/, dayNames[day]) :
                                                status.replace(/D/, dayNamesShort[day]));
                                        html += '<td' + ((dow + firstDay + 6) % 7 >= 5 ? ' class="ui-datepicker-week-end-cell"' : '') + '>' +
                                                (!changeFirstDay ? '<span' :
                                                '<a onclick="jQuery.datepicker._changeFirstDay(\'#' + inst.id + '\', ' + day + ');"') + 
                                                this._addStatus(showStatus, inst.id, dayStatus, initStatus) + ' title="' + dayNames[day] + '">' +
                                                dayNamesMin[day] + (changeFirstDay ? '</a>' : '</span>') + '</td>';
                                }
                                html += '</tr></thead><tbody>';
                                var daysInMonth = this._getDaysInMonth(drawYear, drawMonth);
                                if (drawYear == inst.selectedYear && drawMonth == inst.selectedMonth)
                                        inst.selectedDay = Math.min(inst.selectedDay, daysInMonth);
                                var leadDays = (this._getFirstDayOfMonth(drawYear, drawMonth) - firstDay + 7) % 7;
                                var tzDate = new Date(drawYear, drawMonth, 1 - leadDays);
                                var utcDate = new Date(drawYear, drawMonth, 1 - leadDays);
                                var printDate = utcDate;
                                var numRows = (isMultiMonth ? 6 : Math.ceil((leadDays + daysInMonth) / 7)); // calculate the number of rows to generate
                                for (var dRow = 0; dRow < numRows; dRow++) { // create date picker rows
                                        html += '<tr class="ui-datepicker-days-row">' +
                                                (showWeeks ? '<td class="ui-datepicker-week-col"' +
                                                this._addStatus(showStatus, inst.id, weekStatus, initStatus) + '>' +
                                                calculateWeek(printDate) + '</td>' : '');
                                        for (var dow = 0; dow < 7; dow++) { // create date picker days
                                                var daySettings = (beforeShowDay ?
                                                        beforeShowDay.apply((inst.input ? inst.input[0] : null), [printDate]) : [true, '']);
                                                var otherMonth = (printDate.getMonth() != drawMonth);
                                                var unselectable = otherMonth || !daySettings[0] ||
                                                        (minDate && printDate < minDate) || (maxDate && printDate > maxDate);
                                                html += '<td class="ui-datepicker-days-cell' +
                                                        ((dow + firstDay + 6) % 7 >= 5 ? ' ui-datepicker-week-end-cell' : '') + // highlight weekends
                                                        (otherMonth ? ' ui-datepicker-other-month' : '') + // highlight days from other months
                                                        ((printDate.getTime() == selectedDate.getTime() && drawMonth == inst.selectedMonth && inst._keyEvent) // user pressed key
                                                         || (defaultDate.getTime() == printDate.getTime() && defaultDate.getTime() == selectedDate.getTime()) ?
                                                         // or defaultDate is current printedDate and defaultDate is selectedDate
                                                        ' ' + $.datepicker._dayOverClass : '') + // highlight selected day
                                                        (unselectable ? ' ' + this._unselectableClass : '') +  // highlight unselectable days
                                                        (otherMonth && !showOtherMonths ? '' : ' ' + daySettings[1] + // highlight custom dates
                                                        (printDate.getTime() >= currentDate.getTime() && printDate.getTime() <= endDate.getTime() ? // in current range
                                                        ' ' + this._currentClass : '') + // highlight selected day
                                                        (printDate.getTime() == today.getTime() ? ' ui-datepicker-today' : '')) + '"' + // highlight today (if different)
                                                        ((!otherMonth || showOtherMonths) && daySettings[2] ? ' title="' + daySettings[2] + '"' : '') + // cell title
                                                        (unselectable ? (highlightWeek ? ' onmouseover="jQuery(this).parent().addClass(\'' + this._weekOverClass + '\');"' + // highlight selection week
                                                        ' onmouseout="jQuery(this).parent().removeClass(\'' + this._weekOverClass + '\');"' : '') : // unhighlight selection week
                                                        ' onmouseover="jQuery(this).addClass(\'' + this._dayOverClass + '\')' + // highlight selection
                                                        (highlightWeek ? '.parent().addClass(\'' + this._weekOverClass + '\')' : '') + ';' + // highlight selection week
                                                        (!showStatus || (otherMonth && !showOtherMonths) ? '' : 'jQuery(\'#ui-datepicker-status-' +
                                                        inst.id + '\').html(\'' + (dateStatus.apply((inst.input ? inst.input[0] : null),
                                                        [printDate, inst]) || initStatus) +'\');') + '"' +
                                                        ' onmouseout="jQuery(this).removeClass(\'' + this._dayOverClass + '\')' + // unhighlight selection
                                                        (highlightWeek ? '.parent().removeClass(\'' + this._weekOverClass + '\')' : '') + ';' + // unhighlight selection week
                                                        (!showStatus || (otherMonth && !showOtherMonths) ? '' : 'jQuery(\'#ui-datepicker-status-' +
                                                        inst.id + '\').html(\'' + initStatus + '\');') + '" onclick="jQuery.datepicker._selectDay(\'#' +
                                                        inst.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
                                                tzDate.setDate(tzDate.getDate() + 1);
                                                utcDate.setUTCDate(utcDate.getUTCDate() + 1);
                                                printDate = (tzDate > utcDate ? tzDate : utcDate);
                                        }
                                        html += '</tr>';
                                }
                                drawMonth++;
                                if (drawMonth > 11) {
                                        drawMonth = 0;
                                        drawYear++;
                                }
                                html += '</tbody></table></div>';
                        }
                html += (showStatus ? '<div style="clear: both;"></div><div id="ui-datepicker-status-' + inst.id + 
                        '" class="ui-datepicker-status">' + initStatus + '</div>' : '') +
                        (!closeAtTop && !inst.inline ? controls : '') +
                        '<div style="clear: both;"></div>' + 
                        ($.browser.msie && parseInt($.browser.version,10) < 7 && !inst.inline ? 
                        '<iframe src="javascript:false;" class="ui-datepicker-cover"></iframe>' : '');
                inst._keyEvent = false;
                return html;
        },
        
        /* Generate the month and year header. */
        _generateMonthYearHeader: function(inst, drawMonth, drawYear, minDate, maxDate,
                        selectedDate, secondary, showStatus, initStatus, monthNames) {
                minDate = (inst.rangeStart && minDate && selectedDate < minDate ? selectedDate : minDate);
                var showMonthAfterYear = this._get(inst, 'showMonthAfterYear');
                var html = '<div class="ui-datepicker-header">';
                var monthHtml = '';
                // month selection
                if (secondary || !this._get(inst, 'changeMonth'))
                        monthHtml += monthNames[drawMonth] + '&#xa0;';
                else {
                        var inMinYear = (minDate && minDate.getFullYear() == drawYear);
                        var inMaxYear = (maxDate && maxDate.getFullYear() == drawYear);
                        monthHtml += '<select class="ui-datepicker-new-month" ' +
                                'onchange="jQuery.datepicker._selectMonthYear(\'#' + inst.id + '\', this, \'M\');" ' +
                                'onclick="jQuery.datepicker._clickMonthYear(\'#' + inst.id + '\');"' +
                                this._addStatus(showStatus, inst.id, this._get(inst, 'monthStatus'), initStatus) + '>';
                        for (var month = 0; month < 12; month++) {
                                if ((!inMinYear || month >= minDate.getMonth()) &&
                                                (!inMaxYear || month <= maxDate.getMonth()))
                                        monthHtml += '<option value="' + month + '"' +
                                                (month == drawMonth ? ' selected="selected"' : '') +
                                                '>' + monthNames[month] + '</option>';
                        }
                        monthHtml += '</select>';
                }
                if (!showMonthAfterYear)
                        html += monthHtml;
                // year selection
                if (secondary || !this._get(inst, 'changeYear'))
                        html += drawYear;
                else {
                        // determine range of years to display
                        var years = this._get(inst, '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 = endYear = new Date().getFullYear();
                                year += parseInt(years[0], 10);
                                endYear += 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="ui-datepicker-new-year" ' +
                                'onchange="jQuery.datepicker._selectMonthYear(\'#' + inst.id + '\', this, \'Y\');" ' +
                                'onclick="jQuery.datepicker._clickMonthYear(\'#' + inst.id + '\');"' +
                                this._addStatus(showStatus, inst.id, this._get(inst, 'yearStatus'), initStatus) + '>';
                        for (; year <= endYear; year++) {
                                html += '<option value="' + year + '"' +
                                        (year == drawYear ? ' selected="selected"' : '') +
                                        '>' + year + '</option>';
                        }
                        html += '</select>';
                }
                if (showMonthAfterYear)
                        html += monthHtml;
                html += '</div>'; // Close datepicker_header
                return html;
        },
        
        /* Provide code to set and clear the status panel. */
        _addStatus: function(showStatus, id, text, initStatus) {
                return (showStatus ? ' onmouseover="jQuery(\'#ui-datepicker-status-' + id +
                        '\').html(\'' + (text || initStatus) + '\');" ' +
                        'onmouseout="jQuery(\'#ui-datepicker-status-' + id +
                        '\').html(\'' + initStatus + '\');"' : '');
        },
        
        /* Adjust one of the date sub-fields. */
        _adjustInstDate: function(inst, offset, period) {
                var year = inst.drawYear + (period == 'Y' ? offset : 0);
                var month = inst.drawMonth + (period == 'M' ? offset : 0);
                var day = Math.min(inst.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(inst, 'min', true);
                var maxDate = this._getMinMaxDate(inst, 'max');
                date = (minDate && date < minDate ? minDate : date);
                date = (maxDate && date > maxDate ? maxDate : date);
                inst.selectedDay = date.getDate();
                inst.drawMonth = inst.selectedMonth = date.getMonth();
                inst.drawYear = inst.selectedYear = date.getFullYear();
                if (period == 'M' || period == 'Y')
                        this._notifyChange(inst);
        },
        
        /* Notify change of month/year. */
        _notifyChange: function(inst) {
                var onChange = this._get(inst, 'onChangeMonthYear');
                if (onChange)
                        onChange.apply((inst.input ? inst.input[0] : null),
                                [inst.selectedYear, inst.selectedMonth + 1, inst]);
        },
        
        /* Determine the number of months to show. */
        _getNumberOfMonths: function(inst) {
                var numMonths = this._get(inst, '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(inst, minMax, checkRange) {
                var date = this._determineDate(this._get(inst, minMax + 'Date'), null);
                if (date) {
                        date.setHours(0);
                        date.setMinutes(0);
                        date.setSeconds(0);
                        date.setMilliseconds(0);
                }
                return (!checkRange || !inst.rangeStart ? date :
                        (!date || inst.rangeStart > date ? inst.rangeStart : date));
        },
        
        /* 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(inst, offset, curYear, curMonth) {
                var numMonths = this._getNumberOfMonths(inst);
                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(inst, date);
        },
        
        /* Is the given date in the accepted range? */
        _isInRange: function(inst, date) {
                // during range selection, use minimum of selected date and range start
                var newMinDate = (!inst.rangeStart ? null :
                        new Date(inst.selectedYear, inst.selectedMonth, inst.selectedDay));
                newMinDate = (newMinDate && inst.rangeStart < newMinDate ? inst.rangeStart : newMinDate);
                var minDate = newMinDate || this._getMinMaxDate(inst, 'min');
                var maxDate = this._getMinMaxDate(inst, 'max');
                return ((!minDate || date >= minDate) && (!maxDate || date <= maxDate));
        },
        
        /* Provide the configuration settings for formatting/parsing. */
        _getFormatConfig: function(inst) {
                var shortYearCutoff = this._get(inst, 'shortYearCutoff');
                shortYearCutoff = (typeof shortYearCutoff != 'string' ? shortYearCutoff :
                        new Date().getFullYear() % 100 + parseInt(shortYearCutoff, 10));
                return {shortYearCutoff: shortYearCutoff,
                        dayNamesShort: this._get(inst, 'dayNamesShort'), dayNames: this._get(inst, 'dayNames'),
                        monthNamesShort: this._get(inst, 'monthNamesShort'), monthNames: this._get(inst, 'monthNames')};
        },
        
        /* Format the given date for display. */
        _formatDate: function(inst, day, month, year) {
                if (!day) {
                        inst.currentDay = inst.selectedDay;
                        inst.currentMonth = inst.selectedMonth;
                        inst.currentYear = inst.selectedYear;
                }
                var date = (day ? (typeof day == 'object' ? day : new Date(year, month, day)) :
                        new Date(inst.currentYear, inst.currentMonth, inst.currentDay));
                return this.formatDate(this._get(inst, 'dateFormat'), date, this._getFormatConfig(inst));
        }
});

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

/* Determine whether an object is an array. */
function isArray(a) {
        return (a && (($.browser.safari && typeof a == 'object' && a.length) ||
                (a.constructor && a.constructor.toString().match(/\Array\(\)/))));
};

/* 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){
        
        /* Initialise the date picker. */
        if (!$.datepicker.initialized) {
                $(document.body).append($.datepicker.dpDiv).
                        mousedown($.datepicker._checkExternalClick);
                $.datepicker.initialized = true;
        }
        
        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);
        });
};

$.datepicker = new Datepicker(); // singleton instance
$.datepicker.initialized = false;
$.datepicker.uuid = new Date().getTime();
$.datepicker.version = "@VERSION";

})(jQuery);