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/*
 * jQuery UI Datepicker 1.8.6
 *
 * Copyright 2010, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Datepicker
 *
 * Depends:
 *      jquery.ui.core.js
 */
(function( $, undefined ) {

$.extend($.ui, { datepicker: { version: "1.8.6" } });

var PROP_NAME = 'datepicker';
var dpuuid = new Date().getTime();

/* 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._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.regional = []; // Available regional settings, indexed by language code
        this.regional[''] = { // Default regional settings
                closeText: 'Done', // Display text for close link
                prevText: 'Prev', // Display text for previous month link
                nextText: 'Next', // Display text for next month link
                currentText: 'Today', // Display 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
                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
                weekHeader: 'Wk', // Column header for week of the year
                dateFormat: 'mm/dd/yy', // See format options on parseDate
                firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
                isRTL: false, // True if right-to-left language, false if left-to-right
                showMonthAfterYear: false, // True if the year select precedes month, false for month then year
                yearSuffix: '' // Additional text to append to the year in the month headers
        };
        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: 'fadeIn', // 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
                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
                gotoCurrent: false, // True if today link goes back to current selection instead
                changeMonth: false, // True if month can be selected directly, false if only prev/next
                changeYear: false, // True if year can be selected directly, false if only prev/next
                yearRange: 'c-10:c+10', // Range of years to display in drop-down,
                        // either relative to today's year (-nn:+nn), relative to currently displayed year
                        // (c-nn:c+nn), absolute (nnnn:nnnn), or a combination of the above (nnnn:-n)
                showOtherMonths: false, // True to show dates in other months, false to leave blank
                selectOtherMonths: false, // True to allow selection of dates in other months, false for unselectable
                showWeek: false, // True to show week of the year, false to not show it
                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
                minDate: null, // The earliest selectable date, or null for no limit
                maxDate: null, // The latest selectable date, or null for no limit
                duration: 'fast', // 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
                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
                showButtonPanel: false, // True to show button panel, false to not show it
                autoSize: false // True to size the input for the date format, false to leave as is
        };
        $.extend(this._defaults, this.regional['']);
        this.dpDiv = $('<div id="' + this._mainDivId + '" class="ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all ui-helper-hidden-accessible"></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);
        },
        
        // TODO rename to "widget" when switching to widget factory
        _widgetDatepicker: function() {
                return this.dpDiv;
        },

        /* 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 (var 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) {
                        this.uuid += 1;
                        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(/([^A-Za-z0-9_-])/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 + ' ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all"></div>'))};
        },

        /* Attach the date picker to an input field. */
        _connectDatepicker: function(target, inst) {
                var input = $(target);
                inst.append = $([]);
                inst.trigger = $([]);
                if (input.hasClass(this.markerClassName))
                        return;
                this._attachments(input, inst);
                input.addClass(this.markerClassName).keydown(this._doKeyDown).
                        keypress(this._doKeyPress).keyup(this._doKeyUp).
                        bind("setData.datepicker", function(event, key, value) {
                                inst.settings[key] = value;
                        }).bind("getData.datepicker", function(event, key) {
                                return this._get(inst, key);
                        });
                this._autoSize(inst);
                $.data(target, PROP_NAME, inst);
        },

        /* Make attachments based on settings. */
        _attachments: function(input, inst) {
                var appendText = this._get(inst, 'appendText');
                var isRTL = this._get(inst, 'isRTL');
                if (inst.append)
                        inst.append.remove();
                if (appendText) {
                        inst.append = $('<span class="' + this._appendClass + '">' + appendText + '</span>');
                        input[isRTL ? 'before' : 'after'](inst.append);
                }
                input.unbind('focus', this._showDatepicker);
                if (inst.trigger)
                        inst.trigger.remove();
                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');
                        inst.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 : $('<img/>').attr(
                                        { src:buttonImage, alt:buttonText, title:buttonText })));
                        input[isRTL ? 'before' : 'after'](inst.trigger);
                        inst.trigger.click(function() {
                                if ($.datepicker._datepickerShowing && $.datepicker._lastInput == input[0])
                                        $.datepicker._hideDatepicker();
                                else
                                        $.datepicker._showDatepicker(input[0]);
                                return false;
                        });
                }
        },

        /* Apply the maximum length for the date format. */
        _autoSize: function(inst) {
                if (this._get(inst, 'autoSize') && !inst.inline) {
                        var date = new Date(2009, 12 - 1, 20); // Ensure double digits
                        var dateFormat = this._get(inst, 'dateFormat');
                        if (dateFormat.match(/[DM]/)) {
                                var findMax = function(names) {
                                        var max = 0;
                                        var maxI = 0;
                                        for (var i = 0; i < names.length; i++) {
                                                if (names[i].length > max) {
                                                        max = names[i].length;
                                                        maxI = i;
                                                }
                                        }
                                        return maxI;
                                };
                                date.setMonth(findMax(this._get(inst, (dateFormat.match(/MM/) ?
                                        'monthNames' : 'monthNamesShort'))));
                                date.setDate(findMax(this._get(inst, (dateFormat.match(/DD/) ?
                                        'dayNames' : 'dayNamesShort'))) + 20 - date.getDay());
                        }
                        inst.input.attr('size', this._formatDate(inst, date).length);
                }
        },

        /* 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), true);
                this._updateDatepicker(inst);
                this._updateAlternate(inst);
        },

        /* Pop-up the date picker in a "dialog" box.
           @param  input     element - ignored
           @param  date      string or Date - the initial date to display
           @param  onSelect  function - the function 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, date, onSelect, settings, pos) {
                var inst = this._dialogInst; // internal instance
                if (!inst) {
                        this.uuid += 1;
                        var id = 'dp' + this.uuid;
                        this._dialogInput = $('<input type="text" id="' + id +
                                '" style="position: absolute; top: -100px; width: 0px; z-index: -10;"/>');
                        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 || {});
                date = (date && date.constructor == Date ? this._formatDate(inst, date) : date);
                this._dialogInput.val(date);

                this._pos = (pos ? (pos.length ? pos : [pos.pageX, pos.pageY]) : null);
                if (!this._pos) {
                        var browserWidth = document.documentElement.clientWidth;
                        var browserHeight = document.documentElement.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] + 20) + '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);
                var inst = $.data(target, PROP_NAME);
                if (!$target.hasClass(this.markerClassName)) {
                        return;
                }
                var nodeName = target.nodeName.toLowerCase();
                $.removeData(target, PROP_NAME);
                if (nodeName == 'input') {
                        inst.append.remove();
                        inst.trigger.remove();
                        $target.removeClass(this.markerClassName).
                                unbind('focus', this._showDatepicker).
                                unbind('keydown', this._doKeyDown).
                                unbind('keypress', this._doKeyPress).
                                unbind('keyup', this._doKeyUp);
                } 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);
                var inst = $.data(target, PROP_NAME);
                if (!$target.hasClass(this.markerClassName)) {
                        return;
                }
                var nodeName = target.nodeName.toLowerCase();
                if (nodeName == 'input') {
                        target.disabled = false;
                        inst.trigger.filter('button').
                                each(function() { this.disabled = false; }).end().
                                filter('img').css({opacity: '1.0', cursor: ''});
                }
                else if (nodeName == 'div' || nodeName == 'span') {
                        var inline = $target.children('.' + this._inlineClass);
                        inline.children().removeClass('ui-state-disabled');
                }
                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);
                var inst = $.data(target, PROP_NAME);
                if (!$target.hasClass(this.markerClassName)) {
                        return;
                }
                var nodeName = target.nodeName.toLowerCase();
                if (nodeName == 'input') {
                        target.disabled = true;
                        inst.trigger.filter('button').
                                each(function() { this.disabled = true; }).end().
                                filter('img').css({opacity: '0.5', cursor: 'default'});
                }
                else if (nodeName == 'div' || nodeName == 'span') {
                        var inline = $target.children('.' + this._inlineClass);
                        inline.children().addClass('ui-state-disabled');
                }
                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 or retrieve 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 retrieve,
                           when retrieving also 'all' for all instance settings or
                           'defaults' for all global defaults
           @param  value   any - the new value for the setting
                           (omit if above is an object or to retrieve a value) */
        _optionDatepicker: function(target, name, value) {
                var inst = this._getInst(target);
                if (arguments.length == 2 && typeof name == 'string') {
                        return (name == 'defaults' ? $.extend({}, $.datepicker._defaults) :
                                (inst ? (name == 'all' ? $.extend({}, inst.settings) :
                                this._get(inst, name)) : null));
                }
                var settings = name || {};
                if (typeof name == 'string') {
                        settings = {};
                        settings[name] = value;
                }
                if (inst) {
                        if (this._curInst == inst) {
                                this._hideDatepicker();
                        }
                        var date = this._getDateDatepicker(target, true);
                        extendRemove(inst.settings, settings);
                        this._attachments($(target), inst);
                        this._autoSize(inst);
                        this._setDateDatepicker(target, date);
                        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 */
        _setDateDatepicker: function(target, date) {
                var inst = this._getInst(target);
                if (inst) {
                        this._setDate(inst, date);
                        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
           @param  noDefault  boolean - true if no default date is to be used
           @return Date - the current date */
        _getDateDatepicker: function(target, noDefault) {
                var inst = this._getInst(target);
                if (inst && !inst.inline)
                        this._setDateFromField(inst, noDefault);
                return (inst ? this._getDate(inst) : null);
        },

        /* Handle keystrokes. */
        _doKeyDown: function(event) {
                var inst = $.datepicker._getInst(event.target);
                var handled = true;
                var isRTL = inst.dpDiv.is('.ui-datepicker-rtl');
                inst._keyEvent = true;
                if ($.datepicker._datepickerShowing)
                        switch (event.keyCode) {
                                case 9: $.datepicker._hideDatepicker();
                                                handled = false;
                                                break; // hide on tab out
                                case 13: var sel = $('td.' + $.datepicker._dayOverClass, inst.dpDiv).
                                                        add($('td.' + $.datepicker._currentClass, inst.dpDiv));
                                                if (sel[0])
                                                        $.datepicker._selectDay(event.target, inst.selectedMonth, inst.selectedYear, sel[0]);
                                                else
                                                        $.datepicker._hideDatepicker();
                                                return false; // don't submit the form
                                                break; // select the value on enter
                                case 27: $.datepicker._hideDatepicker();
                                                break; // hide on escape
                                case 33: $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                                                        -$.datepicker._get(inst, 'stepBigMonths') :
                                                        -$.datepicker._get(inst, 'stepMonths')), 'M');
                                                break; // previous month/year on page up/+ ctrl
                                case 34: $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                                                        +$.datepicker._get(inst, 'stepBigMonths') :
                                                        +$.datepicker._get(inst, 'stepMonths')), 'M');
                                                break; // next month/year on page down/+ ctrl
                                case 35: if (event.ctrlKey || event.metaKey) $.datepicker._clearDate(event.target);
                                                handled = event.ctrlKey || event.metaKey;
                                                break; // clear on ctrl or command +end
                                case 36: if (event.ctrlKey || event.metaKey) $.datepicker._gotoToday(event.target);
                                                handled = event.ctrlKey || event.metaKey;
                                                break; // current on ctrl or command +home
                                case 37: if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, (isRTL ? +1 : -1), 'D');
                                                handled = event.ctrlKey || event.metaKey;
                                                // -1 day on ctrl or command +left
                                                if (event.originalEvent.altKey) $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                                                                        -$.datepicker._get(inst, 'stepBigMonths') :
                                                                        -$.datepicker._get(inst, 'stepMonths')), 'M');
                                                // next month/year on alt +left on Mac
                                                break;
                                case 38: if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, -7, 'D');
                                                handled = event.ctrlKey || event.metaKey;
                                                break; // -1 week on ctrl or command +up
                                case 39: if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, (isRTL ? -1 : +1), 'D');
                                                handled = event.ctrlKey || event.metaKey;
                                                // +1 day on ctrl or command +right
                                                if (event.originalEvent.altKey) $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                                                                        +$.datepicker._get(inst, 'stepBigMonths') :
                                                                        +$.datepicker._get(inst, 'stepMonths')), 'M');
                                                // next month/year on alt +right
                                                break;
                                case 40: if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, +7, 'D');
                                                handled = event.ctrlKey || event.metaKey;
                                                break; // +1 week on ctrl or command +down
                                default: handled = false;
                        }
                else if (event.keyCode == 36 && event.ctrlKey) // display the date picker on ctrl+home
                        $.datepicker._showDatepicker(this);
                else {
                        handled = false;
                }
                if (handled) {
                        event.preventDefault();
                        event.stopPropagation();
                }
        },

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

        /* Synchronise manual entry and field/alternate field. */
        _doKeyUp: function(event) {
                var inst = $.datepicker._getInst(event.target);
                if (inst.input.val() != inst.lastVal) {
                        try {
                                var date = $.datepicker.parseDate($.datepicker._get(inst, 'dateFormat'),
                                        (inst.input ? inst.input.val() : null),
                                        $.datepicker._getFormatConfig(inst));
                                if (date) { // only if valid
                                        $.datepicker._setDateFromField(inst);
                                        $.datepicker._updateAlternate(inst);
                                        $.datepicker._updateDatepicker(inst);
                                }
                        }
                        catch (event) {
                                $.datepicker.log(event);
                        }
                }
                return true;
        },

        /* 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 = $.datepicker._getInst(input);
                if ($.datepicker._curInst && $.datepicker._curInst != inst) {
                        $.datepicker._curInst.dpDiv.stop(true, true);
                }
                var beforeShow = $.datepicker._get(inst, 'beforeShow');
                extendRemove(inst.settings, (beforeShow ? beforeShow.apply(input, [input, inst]) : {}));
                inst.lastVal = 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;
                // determine sizing offscreen
                inst.dpDiv.css({position: 'absolute', display: 'block', top: '-1000px'});
                $.datepicker._updateDatepicker(inst);
                // fix width for dynamic number of date pickers
                // 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');
                        var duration = $.datepicker._get(inst, 'duration');
                        var postProcess = function() {
                                $.datepicker._datepickerShowing = true;
                                var borders = $.datepicker._getBorders(inst.dpDiv);
                                inst.dpDiv.find('iframe.ui-datepicker-cover'). // IE6- only
                                        css({left: -borders[0], top: -borders[1],
                                                width: inst.dpDiv.outerWidth(), height: inst.dpDiv.outerHeight()});
                        };
                        inst.dpDiv.zIndex($(input).zIndex()+1);
                        if ($.effects && $.effects[showAnim])
                                inst.dpDiv.show(showAnim, $.datepicker._get(inst, 'showOptions'), duration, postProcess);
                        else
                                inst.dpDiv[showAnim || 'show']((showAnim ? duration : null), postProcess);
                        if (!showAnim || !duration)
                                postProcess();
                        if (inst.input.is(':visible') && !inst.input.is(':disabled'))
                                inst.input.focus();
                        $.datepicker._curInst = inst;
                }
        },

        /* Generate the date picker content. */
        _updateDatepicker: function(inst) {
                var self = this;
                var borders = $.datepicker._getBorders(inst.dpDiv);
                inst.dpDiv.empty().append(this._generateHTML(inst))
                        .find('iframe.ui-datepicker-cover') // IE6- only
                                .css({left: -borders[0], top: -borders[1],
                                        width: inst.dpDiv.outerWidth(), height: inst.dpDiv.outerHeight()})
                        .end()
                        .find('button, .ui-datepicker-prev, .ui-datepicker-next, .ui-datepicker-calendar td a')
                                .bind('mouseout', function(){
                                        $(this).removeClass('ui-state-hover');
                                        if(this.className.indexOf('ui-datepicker-prev') != -1) $(this).removeClass('ui-datepicker-prev-hover');
                                        if(this.className.indexOf('ui-datepicker-next') != -1) $(this).removeClass('ui-datepicker-next-hover');
                                })
                                .bind('mouseover', function(){
                                        if (!self._isDisabledDatepicker( inst.inline ? inst.dpDiv.parent()[0] : inst.input[0])) {
                                                $(this).parents('.ui-datepicker-calendar').find('a').removeClass('ui-state-hover');
                                                $(this).addClass('ui-state-hover');
                                                if(this.className.indexOf('ui-datepicker-prev') != -1) $(this).addClass('ui-datepicker-prev-hover');
                                                if(this.className.indexOf('ui-datepicker-next') != -1) $(this).addClass('ui-datepicker-next-hover');
                                        }
                                })
                        .end()
                        .find('.' + this._dayOverClass + ' a')
                                .trigger('mouseover')
                        .end();
                var numMonths = this._getNumberOfMonths(inst);
                var cols = numMonths[1];
                var width = 17;
                if (cols > 1)
                        inst.dpDiv.addClass('ui-datepicker-multi-' + cols).css('width', (width * cols) + 'em');
                else
                        inst.dpDiv.removeClass('ui-datepicker-multi-2 ui-datepicker-multi-3 ui-datepicker-multi-4').width('');
                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 == $.datepicker._curInst && $.datepicker._datepickerShowing && inst.input &&
                                inst.input.is(':visible') && !inst.input.is(':disabled'))
                        inst.input.focus();
        },

        /* Retrieve the size of left and top borders for an element.
           @param  elem  (jQuery object) the element of interest
           @return  (number[2]) the left and top borders */
        _getBorders: function(elem) {
                var convert = function(value) {
                        return {thin: 1, medium: 2, thick: 3}[value] || value;
                };
                return [parseFloat(convert(elem.css('border-left-width'))),
                        parseFloat(convert(elem.css('border-top-width')))];
        },

        /* Check positioning to remain on screen. */
        _checkOffset: function(inst, offset, isFixed) {
                var dpWidth = inst.dpDiv.outerWidth();
                var dpHeight = inst.dpDiv.outerHeight();
                var inputWidth = inst.input ? inst.input.outerWidth() : 0;
                var inputHeight = inst.input ? inst.input.outerHeight() : 0;
                var viewWidth = document.documentElement.clientWidth + $(document).scrollLeft();
                var viewHeight = document.documentElement.clientHeight + $(document).scrollTop();

                offset.left -= (this._get(inst, 'isRTL') ? (dpWidth - inputWidth) : 0);
                offset.left -= (isFixed && offset.left == inst.input.offset().left) ? $(document).scrollLeft() : 0;
                offset.top -= (isFixed && offset.top == (inst.input.offset().top + inputHeight)) ? $(document).scrollTop() : 0;

                // now check if datepicker is showing outside window viewport - move to a better place if so.
                offset.left -= Math.min(offset.left, (offset.left + dpWidth > viewWidth && viewWidth > dpWidth) ?
                        Math.abs(offset.left + dpWidth - viewWidth) : 0);
                offset.top -= Math.min(offset.top, (offset.top + dpHeight > viewHeight && viewHeight > dpHeight) ?
                        Math.abs(dpHeight + inputHeight) : 0);

                return offset;
        },

        /* Find an object's position on the screen. */
        _findPos: function(obj) {
                var inst = this._getInst(obj);
                var isRTL = this._get(inst, 'isRTL');
        while (obj && (obj.type == 'hidden' || obj.nodeType != 1)) {
            obj = obj[isRTL ? 'previousSibling' : '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 */
        _hideDatepicker: function(input) {
                var inst = this._curInst;
                if (!inst || (input && inst != $.data(input, PROP_NAME)))
                        return;
                if (this._datepickerShowing) {
                        var showAnim = this._get(inst, 'showAnim');
                        var duration = this._get(inst, 'duration');
                        var postProcess = function() {
                                $.datepicker._tidyDialog(inst);
                                this._curInst = null;
                        };
                        if ($.effects && $.effects[showAnim])
                                inst.dpDiv.hide(showAnim, $.datepicker._get(inst, 'showOptions'), duration, postProcess);
                        else
                                inst.dpDiv[(showAnim == 'slideDown' ? 'slideUp' :
                                        (showAnim == 'fadeIn' ? 'fadeOut' : 'hide'))]((showAnim ? duration : null), postProcess);
                        if (!showAnim)
                                postProcess();
                        var onClose = this._get(inst, 'onClose');
                        if (onClose)
                                onClose.apply((inst.input ? inst.input[0] : null),
                                        [(inst.input ? inst.input.val() : ''), inst]);  // trigger custom callback
                        this._datepickerShowing = false;
                        this._lastInput = null;
                        if (this._inDialog) {
                                this._dialogInput.css({ position: 'absolute', left: '0', top: '-100px' });
                                if ($.blockUI) {
                                        $.unblockUI();
                                        $('body').append(this.dpDiv);
                                }
                        }
                        this._inDialog = false;
                }
        },

        /* Tidy up after a dialog display. */
        _tidyDialog: function(inst) {
                inst.dpDiv.removeClass(this._dialogClass).unbind('.ui-datepicker-calendar');
        },

        /* Close date picker if clicked elsewhere. */
        _checkExternalClick: function(event) {
                if (!$.datepicker._curInst)
                        return;
                var $target = $(event.target);
                if ($target[0].id != $.datepicker._mainDivId &&
                                $target.parents('#' + $.datepicker._mainDivId).length == 0 &&
                                !$target.hasClass($.datepicker.markerClassName) &&
                                !$target.hasClass($.datepicker._triggerClass) &&
                                $.datepicker._datepickerShowing && !($.datepicker._inDialog && $.blockUI))
                        $.datepicker._hideDatepicker();
        },

        /* Adjust one of the date sub-fields. */
        _adjustDate: function(id, offset, period) {
                var target = $(id);
                var inst = this._getInst(target[0]);
                if (this._isDisabledDatepicker(target[0])) {
                        return;
                }
                this._adjustInstDate(inst, offset +
                        (period == 'M' ? this._get(inst, 'showCurrentAtPos') : 0), // undo positioning
                        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) {
                        setTimeout(function() {
                                inst.input.focus();
                        }, 0);
                }
                inst._selectingMonthYear = !inst._selectingMonthYear;
        },

        /* Action for selecting a day. */
        _selectDay: function(id, month, year, td) {
                var target = $(id);
                if ($(td).hasClass(this._unselectableClass) || this._isDisabledDatepicker(target[0])) {
                        return;
                }
                var inst = this._getInst(target[0]);
                inst.selectedDay = inst.currentDay = $('a', td).html();
                inst.selectedMonth = inst.currentMonth = month;
                inst.selectedYear = inst.currentYear = year;
                this._selectDate(id, this._formatDate(inst,
                        inst.currentDay, inst.currentMonth, inst.currentYear));
        },

        /* Erase the input field and hide the date picker. */
        _clearDate: function(id) {
                var target = $(id);
                var inst = this._getInst(target[0]);
                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 (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 {
                        this._hideDatepicker();
                        this._lastInput = inst.input[0];
                        if (typeof(inst.input[0]) != 'object')
                                inst.input.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') || this._get(inst, 'dateFormat');
                        var date = this._getDate(inst);
                        var dateStr = 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.getTime());
                // Find Thursday of this week starting on Monday
                checkDate.setDate(checkDate.getDate() + 4 - (checkDate.getDay() || 7));
                var time = checkDate.getTime();
                checkDate.setMonth(0); // Compare with Jan 1
                checkDate.setDate(1);
                return Math.floor(Math.round((time - checkDate) / 86400000) / 7) + 1;
        },

        /* 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 size = (match == '@' ? 14 : (match == '!' ? 20 :
                                (match == 'y' ? 4 : (match == 'o' ? 3 : 2))));
                        var digits = new RegExp('^\\d{1,' + size + '}');
                        var num = value.substring(iValue).match(digits);
                        if (!num)
                                throw 'Missing number at position ' + iValue;
                        iValue += num[0].length;
                        return parseInt(num[0], 10);
                };
                // Extract a name from the string value and convert to an index
                var getName = function(match, shortNames, longNames) {
                        var names = (lookAhead(match) ? longNames : shortNames);
                        for (var i = 0; i < names.length; i++) {
                                if (value.substr(iValue, names[i].length).toLowerCase() == names[i].toLowerCase()) {
                                        iValue += names[i].length;
                                        return i + 1;
                                }
                        }
                        throw 'Unknown name at position ' + iValue;
                };
                // 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 '!':
                                                var date = new Date((getNumber('!') - this._ticksTo1970) / 10000);
                                                year = date.getFullYear();
                                                month = date.getMonth() + 1;
                                                day = date.getDate();
                                                break;
                                        case "'":
                                                if (lookAhead("'"))
                                                        checkLiteral();
                                                else
                                                        literal = true;
                                                break;
                                        default:
                                                checkLiteral();
                                }
                }
                if (year == -1)
                        year = new Date().getFullYear();
                else 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 = this._daylightSavingAdjust(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
        TICKS: '!',
        TIMESTAMP: '@',
        W3C: 'yy-mm-dd', // ISO 8601

        _ticksTo1970: (((1970 - 1) * 365 + Math.floor(1970 / 4) - Math.floor(1970 / 100) +
                Math.floor(1970 / 400)) * 24 * 60 * 60 * 10000000),

        /* 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)
           ! - Windows ticks (100ns since 01/01/0001)
           '...' - 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':
                                                        output += formatNumber('o',
                                                                (date.getTime() - new Date(date.getFullYear(), 0, 0).getTime()) / 86400000, 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 '!':
                                                        output += date.getTime() * 10000 + this._ticksTo1970;
                                                        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;
                // 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;
                };
                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, noDefault) {
                if (inst.input.val() == inst.lastVal) {
                        return;
                }
                var dateFormat = this._get(inst, 'dateFormat');
                var dates = inst.lastVal = inst.input ? inst.input.val() : null;
                var date, defaultDate;
                date = defaultDate = this._getDefaultDate(inst);
                var settings = this._getFormatConfig(inst);
                try {
                        date = this.parseDate(dateFormat, dates, settings) || defaultDate;
                } catch (event) {
                        this.log(event);
                        dates = (noDefault ? '' : dates);
                }
                inst.selectedDay = date.getDate();
                inst.drawMonth = inst.selectedMonth = date.getMonth();
                inst.drawYear = inst.selectedYear = date.getFullYear();
                inst.currentDay = (dates ? date.getDate() : 0);
                inst.currentMonth = (dates ? date.getMonth() : 0);
                inst.currentYear = (dates ? date.getFullYear() : 0);
                this._adjustInstDate(inst);
        },

        /* Retrieve the default date shown on opening. */
        _getDefaultDate: function(inst) {
                return this._restrictMinMax(inst,
                        this._determineDate(inst, this._get(inst, 'defaultDate'), new Date()));
        },

        /* A date may be specified as an exact value or a relative one. */
        _determineDate: function(inst, date, defaultDate) {
                var offsetNumeric = function(offset) {
                        var date = new Date();
                        date.setDate(date.getDate() + offset);
                        return date;
                };
                var offsetString = function(offset) {
                        try {
                                return $.datepicker.parseDate($.datepicker._get(inst, 'dateFormat'),
                                        offset, $.datepicker._getFormatConfig(inst));
                        }
                        catch (e) {
                                // Ignore
                        }
                        var date = (offset.toLowerCase().match(/^c/) ?
                                $.datepicker._getDate(inst) : null) || 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, $.datepicker._getDaysInMonth(year, month));
                                                break;
                                        case 'y': case 'Y' :
                                                year += parseInt(matches[1],10);
                                                day = Math.min(day, $.datepicker._getDaysInMonth(year, month));
                                                break;
                                }
                                matches = pattern.exec(offset);
                        }
                        return new Date(year, month, day);
                };
                date = (date == null ? defaultDate : (typeof date == 'string' ? offsetString(date) :
                        (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 this._daylightSavingAdjust(date);
        },

        /* Handle switch to/from daylight saving.
           Hours may be non-zero on daylight saving cut-over:
           > 12 when midnight changeover, but then cannot generate
           midnight datetime, so jump to 1AM, otherwise reset.
           @param  date  (Date) the date to check
           @return  (Date) the corrected date */
        _daylightSavingAdjust: function(date) {
                if (!date) return null;
                date.setHours(date.getHours() > 12 ? date.getHours() + 2 : 0);
                return date;
        },

        /* Set the date(s) directly. */
        _setDate: function(inst, date, noChange) {
                var clear = !(date);
                var origMonth = inst.selectedMonth;
                var origYear = inst.selectedYear;
                date = this._restrictMinMax(inst, this._determineDate(inst, 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 ((origMonth != inst.selectedMonth || origYear != inst.selectedYear) && !noChange)
                        this._notifyChange(inst);
                this._adjustInstDate(inst);
                if (inst.input) {
                        inst.input.val(clear ? '' : this._formatDate(inst));
                }
        },

        /* Retrieve the date(s) directly. */
        _getDate: function(inst) {
                var startDate = (!inst.currentYear || (inst.input && inst.input.val() == '') ? null :
                        this._daylightSavingAdjust(new Date(
                        inst.currentYear, inst.currentMonth, inst.currentDay)));
                        return startDate;
        },

        /* Generate the HTML for the current state of the date picker. */
        _generateHTML: function(inst) {
                var today = new Date();
                today = this._daylightSavingAdjust(
                        new Date(today.getFullYear(), today.getMonth(), today.getDate())); // clear time
                var isRTL = this._get(inst, 'isRTL');
                var showButtonPanel = this._get(inst, 'showButtonPanel');
                var hideIfNoPrevNext = this._get(inst, 'hideIfNoPrevNext');
                var navigationAsDateFormat = this._get(inst, 'navigationAsDateFormat');
                var numMonths = this._getNumberOfMonths(inst);
                var showCurrentAtPos = this._get(inst, 'showCurrentAtPos');
                var stepMonths = this._get(inst, 'stepMonths');
                var isMultiMonth = (numMonths[0] != 1 || numMonths[1] != 1);
                var currentDate = this._daylightSavingAdjust((!inst.currentDay ? new Date(9999, 9, 9) :
                        new Date(inst.currentYear, inst.currentMonth, inst.currentDay)));
                var minDate = this._getMinMaxDate(inst, 'min');
                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 = this._daylightSavingAdjust(new Date(maxDate.getFullYear(),
                                maxDate.getMonth() - (numMonths[0] * numMonths[1]) + 1, maxDate.getDate()));
                        maxDraw = (minDate && maxDraw < minDate ? minDate : maxDraw);
                        while (this._daylightSavingAdjust(new Date(drawYear, drawMonth, 1)) > maxDraw) {
                                drawMonth--;
                                if (drawMonth < 0) {
                                        drawMonth = 11;
                                        drawYear--;
                                }
                        }
                }
                inst.drawMonth = drawMonth;
                inst.drawYear = drawYear;
                var prevText = this._get(inst, 'prevText');
                prevText = (!navigationAsDateFormat ? prevText : this.formatDate(prevText,
                        this._daylightSavingAdjust(new Date(drawYear, drawMonth - stepMonths, 1)),
                        this._getFormatConfig(inst)));
                var prev = (this._canAdjustMonth(inst, -1, drawYear, drawMonth) ?
                        '<a class="ui-datepicker-prev ui-corner-all" onclick="DP_jQuery_' + dpuuid +
                        '.datepicker._adjustDate(\'#' + inst.id + '\', -' + stepMonths + ', \'M\');"' +
                        ' title="' + prevText + '"><span class="ui-icon ui-icon-circle-triangle-' + ( isRTL ? 'e' : 'w') + '">' + prevText + '</span></a>' :
                        (hideIfNoPrevNext ? '' : '<a class="ui-datepicker-prev ui-corner-all ui-state-disabled" title="'+ prevText +'"><span class="ui-icon ui-icon-circle-triangle-' + ( isRTL ? 'e' : 'w') + '">' + prevText + '</span></a>'));
                var nextText = this._get(inst, 'nextText');
                nextText = (!navigationAsDateFormat ? nextText : this.formatDate(nextText,
                        this._daylightSavingAdjust(new Date(drawYear, drawMonth + stepMonths, 1)),
                        this._getFormatConfig(inst)));
                var next = (this._canAdjustMonth(inst, +1, drawYear, drawMonth) ?
                        '<a class="ui-datepicker-next ui-corner-all" onclick="DP_jQuery_' + dpuuid +
                        '.datepicker._adjustDate(\'#' + inst.id + '\', +' + stepMonths + ', \'M\');"' +
                        ' title="' + nextText + '"><span class="ui-icon ui-icon-circle-triangle-' + ( isRTL ? 'w' : 'e') + '">' + nextText + '</span></a>' :
                        (hideIfNoPrevNext ? '' : '<a class="ui-datepicker-next ui-corner-all ui-state-disabled" title="'+ nextText + '"><span class="ui-icon ui-icon-circle-triangle-' + ( isRTL ? 'w' : 'e') + '">' + nextText + '</span></a>'));
                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 controls = (!inst.inline ? '<button type="button" class="ui-datepicker-close ui-state-default ui-priority-primary ui-corner-all" onclick="DP_jQuery_' + dpuuid +
                        '.datepicker._hideDatepicker();">' + this._get(inst, 'closeText') + '</button>' : '');
                var buttonPanel = (showButtonPanel) ? '<div class="ui-datepicker-buttonpane ui-widget-content">' + (isRTL ? controls : '') +
                        (this._isInRange(inst, gotoDate) ? '<button type="button" class="ui-datepicker-current ui-state-default ui-priority-secondary ui-corner-all" onclick="DP_jQuery_' + dpuuid +
                        '.datepicker._gotoToday(\'#' + inst.id + '\');"' +
                        '>' + currentText + '</button>' : '') + (isRTL ? '' : controls) + '</div>' : '';
                var firstDay = parseInt(this._get(inst, 'firstDay'),10);
                firstDay = (isNaN(firstDay) ? 0 : firstDay);
                var showWeek = this._get(inst, 'showWeek');
                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 monthNamesShort = this._get(inst, 'monthNamesShort');
                var beforeShowDay = this._get(inst, 'beforeShowDay');
                var showOtherMonths = this._get(inst, 'showOtherMonths');
                var selectOtherMonths = this._get(inst, 'selectOtherMonths');
                var calculateWeek = this._get(inst, 'calculateWeek') || this.iso8601Week;
                var defaultDate = this._getDefaultDate(inst);
                var html = '';
                for (var row = 0; row < numMonths[0]; row++) {
                        var group = '';
                        for (var col = 0; col < numMonths[1]; col++) {
                                var selectedDate = this._daylightSavingAdjust(new Date(drawYear, drawMonth, inst.selectedDay));
                                var cornerClass = ' ui-corner-all';
                                var calender = '';
                                if (isMultiMonth) {
                                        calender += '<div class="ui-datepicker-group';
                                        if (numMonths[1] > 1)
                                                switch (col) {
                                                        case 0: calender += ' ui-datepicker-group-first';
                                                                cornerClass = ' ui-corner-' + (isRTL ? 'right' : 'left'); break;
                                                        case numMonths[1]-1: calender += ' ui-datepicker-group-last';
                                                                cornerClass = ' ui-corner-' + (isRTL ? 'left' : 'right'); break;
                                                        default: calender += ' ui-datepicker-group-middle'; cornerClass = ''; break;
                                                }
                                        calender += '">';
                                }
                                calender += '<div class="ui-datepicker-header ui-widget-header ui-helper-clearfix' + cornerClass + '">' +
                                        (/all|left/.test(cornerClass) && row == 0 ? (isRTL ? next : prev) : '') +
                                        (/all|right/.test(cornerClass) && row == 0 ? (isRTL ? prev : next) : '') +
                                        this._generateMonthYearHeader(inst, drawMonth, drawYear, minDate, maxDate,
                                        row > 0 || col > 0, monthNames, monthNamesShort) + // draw month headers
                                        '</div><table class="ui-datepicker-calendar"><thead>' +
                                        '<tr>';
                                var thead = (showWeek ? '<th class="ui-datepicker-week-col">' + this._get(inst, 'weekHeader') + '</th>' : '');
                                for (var dow = 0; dow < 7; dow++) { // days of the week
                                        var day = (dow + firstDay) % 7;
                                        thead += '<th' + ((dow + firstDay + 6) % 7 >= 5 ? ' class="ui-datepicker-week-end"' : '') + '>' +
                                                '<span title="' + dayNames[day] + '">' + dayNamesMin[day] + '</span></th>';
                                }
                                calender += thead + '</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 numRows = (isMultiMonth ? 6 : Math.ceil((leadDays + daysInMonth) / 7)); // calculate the number of rows to generate
                                var printDate = this._daylightSavingAdjust(new Date(drawYear, drawMonth, 1 - leadDays));
                                for (var dRow = 0; dRow < numRows; dRow++) { // create date picker rows
                                        calender += '<tr>';
                                        var tbody = (!showWeek ? '' : '<td class="ui-datepicker-week-col">' +
                                                this._get(inst, '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 && !selectOtherMonths) || !daySettings[0] ||
                                                        (minDate && printDate < minDate) || (maxDate && printDate > maxDate);
                                                tbody += '<td class="' +
                                                        ((dow + firstDay + 6) % 7 >= 5 ? ' ui-datepicker-week-end' : '') + // 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
                                                        ' ' + this._dayOverClass : '') + // highlight selected day
                                                        (unselectable ? ' ' + this._unselectableClass + ' ui-state-disabled': '') +  // highlight unselectable days
                                                        (otherMonth && !showOtherMonths ? '' : ' ' + daySettings[1] + // highlight custom dates
                                                        (printDate.getTime() == currentDate.getTime() ? ' ' + 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 ? '' : ' onclick="DP_jQuery_' + dpuuid + '.datepicker._selectDay(\'#' +
                                                        inst.id + '\',' + printDate.getMonth() + ',' + printDate.getFullYear() + ', this);return false;"') + '>' + // actions
                                                        (otherMonth && !showOtherMonths ? '&#xa0;' : // display for other months
                                                        (unselectable ? '<span class="ui-state-default">' + printDate.getDate() + '</span>' : '<a class="ui-state-default' +
                                                        (printDate.getTime() == today.getTime() ? ' ui-state-highlight' : '') +
                                                        (printDate.getTime() == currentDate.getTime() ? ' ui-state-active' : '') + // highlight selected day
                                                        (otherMonth ? ' ui-priority-secondary' : '') + // distinguish dates from other months
                                                        '" href="#">' + printDate.getDate() + '</a>')) + '</td>'; // display selectable date
                                                printDate.setDate(printDate.getDate() + 1);
                                                printDate = this._daylightSavingAdjust(printDate);
                                        }
                                        calender += tbody + '</tr>';
                                }
                                drawMonth++;
                                if (drawMonth > 11) {
                                        drawMonth = 0;
                                        drawYear++;
                                }
                                calender += '</tbody></table>' + (isMultiMonth ? '</div>' + 
                                                        ((numMonths[0] > 0 && col == numMonths[1]-1) ? '<div class="ui-datepicker-row-break"></div>' : '') : '');
                                group += calender;
                        }
                        html += group;
                }
                html += buttonPanel + ($.browser.msie && parseInt($.browser.version,10) < 7 && !inst.inline ?
                        '<iframe src="javascript:false;" class="ui-datepicker-cover" frameborder="0"></iframe>' : '');
                inst._keyEvent = false;
                return html;
        },

        /* Generate the month and year header. */
        _generateMonthYearHeader: function(inst, drawMonth, drawYear, minDate, maxDate,
                        secondary, monthNames, monthNamesShort) {
                var changeMonth = this._get(inst, 'changeMonth');
                var changeYear = this._get(inst, 'changeYear');
                var showMonthAfterYear = this._get(inst, 'showMonthAfterYear');
                var html = '<div class="ui-datepicker-title">';
                var monthHtml = '';
                // month selection
                if (secondary || !changeMonth)
                        monthHtml += '<span class="ui-datepicker-month">' + monthNames[drawMonth] + '</span>';
                else {
                        var inMinYear = (minDate && minDate.getFullYear() == drawYear);
                        var inMaxYear = (maxDate && maxDate.getFullYear() == drawYear);
                        monthHtml += '<select class="ui-datepicker-month" ' +
                                'onchange="DP_jQuery_' + dpuuid + '.datepicker._selectMonthYear(\'#' + inst.id + '\', this, \'M\');" ' +
                                'onclick="DP_jQuery_' + dpuuid + '.datepicker._clickMonthYear(\'#' + inst.id + '\');"' +
                                '>';
                        for (var month = 0; month < 12; month++) {
                                if ((!inMinYear || month >= minDate.getMonth()) &&
                                                (!inMaxYear || month <= maxDate.getMonth()))
                                        monthHtml += '<option value="' + month + '"' +
                                                (month == drawMonth ? ' selected="selected"' : '') +
                                                '>' + monthNamesShort[month] + '</option>';
                        }
                        monthHtml += '</select>';
                }
                if (!showMonthAfterYear)
                        html += monthHtml + (secondary || !(changeMonth && changeYear) ? '&#xa0;' : '');
                // year selection
                if (secondary || !changeYear)
                        html += '<span class="ui-datepicker-year">' + drawYear + '</span>';
                else {
                        // determine range of years to display
                        var years = this._get(inst, 'yearRange').split(':');
                        var thisYear = new Date().getFullYear();
                        var determineYear = function(value) {
                                var year = (value.match(/c[+-].*/) ? drawYear + parseInt(value.substring(1), 10) :
                                        (value.match(/[+-].*/) ? thisYear + parseInt(value, 10) :
                                        parseInt(value, 10)));
                                return (isNaN(year) ? thisYear : year);
                        };
                        var year = determineYear(years[0]);
                        var endYear = Math.max(year, determineYear(years[1] || ''));
                        year = (minDate ? Math.max(year, minDate.getFullYear()) : year);
                        endYear = (maxDate ? Math.min(endYear, maxDate.getFullYear()) : endYear);
                        html += '<select class="ui-datepicker-year" ' +
                                'onchange="DP_jQuery_' + dpuuid + '.datepicker._selectMonthYear(\'#' + inst.id + '\', this, \'Y\');" ' +
                                'onclick="DP_jQuery_' + dpuuid + '.datepicker._clickMonthYear(\'#' + inst.id + '\');"' +
                                '>';
                        for (; year <= endYear; year++) {
                                html += '<option value="' + year + '"' +
                                        (year == drawYear ? ' selected="selected"' : '') +
                                        '>' + year + '</option>';
                        }
                        html += '</select>';
                }
                html += this._get(inst, 'yearSuffix');
                if (showMonthAfterYear)
                        html += (secondary || !(changeMonth && changeYear) ? '&#xa0;' : '') + monthHtml;
                html += '</div>'; // Close datepicker_header
                return html;
        },

        /* 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 = this._restrictMinMax(inst,
                        this._daylightSavingAdjust(new Date(year, month, day)));
                inst.selectedDay = date.getDate();
                inst.drawMonth = inst.selectedMonth = date.getMonth();
                inst.drawYear = inst.selectedYear = date.getFullYear();
                if (period == 'M' || period == 'Y')
                        this._notifyChange(inst);
        },

        /* Ensure a date is within any min/max bounds. */
        _restrictMinMax: function(inst, date) {
                var minDate = this._getMinMaxDate(inst, 'min');
                var maxDate = this._getMinMaxDate(inst, 'max');
                date = (minDate && date < minDate ? minDate : date);
                date = (maxDate && date > maxDate ? maxDate : date);
                return date;
        },

        /* 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. */
        _getMinMaxDate: function(inst, minMax) {
                return this._determineDate(inst, this._get(inst, minMax + 'Date'), null);
        },

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

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

        /* Determines if we should allow a "next/prev" month display change. */
        _canAdjustMonth: function(inst, offset, curYear, curMonth) {
                var numMonths = this._getNumberOfMonths(inst);
                var date = this._daylightSavingAdjust(new Date(curYear,
                        curMonth + (offset < 0 ? offset : numMonths[0] * 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) {
                var minDate = this._getMinMaxDate(inst, 'min');
                var maxDate = this._getMinMaxDate(inst, 'max');
                return ((!minDate || date.getTime() >= minDate.getTime()) &&
                        (!maxDate || date.getTime() <= maxDate.getTime()));
        },

        /* 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 :
                        this._daylightSavingAdjust(new Date(year, month, day))) :
                        this._daylightSavingAdjust(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) {
                $(document).mousedown($.datepicker._checkExternalClick).
                        find('body').append($.datepicker.dpDiv);
                $.datepicker.initialized = true;
        }

        var otherArgs = Array.prototype.slice.call(arguments, 1);
        if (typeof options == 'string' && (options == 'isDisabled' || options == 'getDate' || options == 'widget'))
                return $.datepicker['_' + options + 'Datepicker'].
                        apply($.datepicker, [this[0]].concat(otherArgs));
        if (options == 'option' && arguments.length == 2 && typeof arguments[1] == 'string')
                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 = "1.8.6";

// Workaround for #4055
// Add another global to avoid noConflict issues with inline event handlers
window['DP_jQuery_' + dpuuid] = $;

})(jQuery);