/* http://keith-wood.name/datepick.html
Date picker for jQuery v4.0.6.
Written by Keith Wood (kbwood{at}iinet.com.au) February 2010.
Dual licensed under the GPL (http://dev.jquery.com/browser/trunk/jquery/GPL-LICENSE.txt) and 
MIT (http://dev.jquery.com/browser/trunk/jquery/MIT-LICENSE.txt) licenses. 
Please attribute the author if you use it. */

(function ($) { // Hide scope, no $ conflict

    /* Datepicker manager. */
    function Datepicker() {
        this._defaults = {
            pickerClass: '', // CSS class to add to this instance of the datepicker
            showOnFocus: true, // True for popup on focus, false for not
            showTrigger: null, // Element to be cloned for a trigger, null for none
            showAnim: 'show', // Name of jQuery animation for popup, '' for no animation
            showOptions: {}, // Options for enhanced animations
            showSpeed: 'normal', // Duration of display/closure
            popupContainer: null, // The element to which a popup calendar is added, null for body
            alignment: 'bottom', // Alignment of popup - with nominated corner of input:
            // 'top' or 'bottom' aligns depending on language direction,
            // 'topLeft', 'topRight', 'bottomLeft', 'bottomRight'
            fixedWeeks: false, // True to always show 6 weeks, false to only show as many as are needed
            firstDay: 0, // First day of the week, 0 = Sunday, 1 = Monday, ...
            calculateWeek: this.iso8601Week, // Calculate week of the year from a date, null for ISO8601
            monthsToShow: 1, // How many months to show, cols or [rows, cols]
            monthsOffset: 0, // How many months to offset the primary month by;
            // may be a function that takes the date and returns the offset
            monthsToStep: 1, // How many months to move when prev/next clicked
            monthsToJump: 12, // How many months to move when large prev/next clicked
            useMouseWheel: true, // True to use mousewheel if available, false to never use it
            changeMonth: true, // True to change month/year via drop-down, false for navigation only
            yearRange: 'c-10:c+10', // Range of years to show in drop-down: 'any' for direct text entry
            // or 'start:end', where start/end are '+-nn' for relative to today
            // or 'c+-nn' for relative to the currently selected date
            // or 'nnnn' for an absolute year
            shortYearCutoff: '+10', // Cutoff for two-digit year in the current century
            showOtherMonths: false, // True to show dates from other months, false to not show them
            selectOtherMonths: false, // True to allow selection of dates from other months too
            defaultDate: null, // Date to show if no other selected
            selectDefaultDate: false, // True to pre-select the default date if no other is chosen
            minDate: null, // The minimum selectable date
            maxDate: null, // The maximum selectable date
            dateFormat: 'mm/dd/yyyy', // Format for dates
            autoSize: false, // True to size the input field according to the date format
            rangeSelect: false, // Allows for selecting a date range on one date picker
            rangeSeparator: ' - ', // Text between two dates in a range
            multiSelect: 0, // Maximum number of selectable dates, zero for single select
            multiSeparator: ',', // Text between multiple dates
            onDate: null, // Callback as a date is added to the datepicker
            onShow: null, // Callback just before a datepicker is shown
            onChangeMonthYear: null, // Callback when a new month/year is selected
            onSelect: null, // Callback when a date is selected
            onClose: null, // Callback when a datepicker is closed
            altField: null, // Alternate field to update in synch with the datepicker
            altFormat: null, // Date format for alternate field, defaults to dateFormat
            constrainInput: true, // True to constrain typed input to dateFormat allowed characters
            commandsAsDateFormat: false, // True to apply formatDate to the command texts
            commands: this.commands // Command actions that may be added to a layout by name
        };
        this.regional = {
            '': { // US/English
                monthNames: ['January', 'February', 'March', 'April', 'May', 'June',
			'July', 'August', 'September', 'October', 'November', 'December'],
                monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
                dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
                dayNamesShort: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
                dayNamesMin: ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'],
                dateFormat: 'mm/dd/yyyy', // See options on formatDate
                firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
                renderer: this.defaultRenderer, // The rendering templates
                prevText: '&lt;Prev', // Text for the previous month command
                prevStatus: 'Show the previous month', // Status text for the previous month command
                prevJumpText: '&lt;&lt;', // Text for the previous year command
                prevJumpStatus: 'Show the previous year', // Status text for the previous year command
                nextText: 'Next&gt;', // Text for the next month command
                nextStatus: 'Show the next month', // Status text for the next month command
                nextJumpText: '&gt;&gt;', // Text for the next year command
                nextJumpStatus: 'Show the next year', // Status text for the next year command
                currentText: 'Current', // Text for the current month command
                currentStatus: 'Show the current month', // Status text for the current month command
                todayText: 'Today', // Text for the today's month command
                todayStatus: 'Show today\'s month', // Status text for the today's month command
                clearText: 'Clear', // Text for the clear command
                clearStatus: 'Clear all the dates', // Status text for the clear command
                closeText: 'Close', // Text for the close command
                closeStatus: 'Close the datepicker', // Status text for the close command
                yearStatus: 'Change the year', // Status text for year selection
                monthStatus: 'Change the month', // Status text for month selection
                weekText: 'Wk', // Text for week of the year column header
                weekStatus: 'Week of the year', // Status text for week of the year column header
                dayStatus: 'Select DD, M d, yyyy', // Status text for selectable days
                defaultStatus: 'Select a date', // Status text shown by default
                isRTL: false // True if language is right-to-left
            }
        };
        $.extend(this._defaults, this.regional['']);
        this._disabled = [];
    }

    $.extend(Datepicker.prototype, {
        dataName: 'datepick',

        /* Class name added to elements to indicate already configured with datepicker. */
        markerClass: 'hasDatepick',

        _popupClass: 'datepick-popup', // Marker for popup division
        _triggerClass: 'datepick-trigger', // Marker for trigger element
        _disableClass: 'datepick-disable', // Marker for disabled element
        _coverClass: 'datepick-cover', // Marker for iframe backing element
        _monthYearClass: 'datepick-month-year', // Marker for month/year inputs
        _curMonthClass: 'datepick-month-', // Marker for current month/year
        _anyYearClass: 'datepick-any-year', // Marker for year direct input
        _curDoWClass: 'datepick-dow-', // Marker for day of week

        commands: { // Command actions that may be added to a layout by name
            // name: { // The command name, use '{button:name}' or '{link:name}' in layouts
            //		text: '', // The field in the regional settings for the displayed text
            //		status: '', // The field in the regional settings for the status text
            //      // The keystroke to trigger the action
            //		keystroke: {keyCode: nn, ctrlKey: boolean, altKey: boolean, shiftKey: boolean},
            //		enabled: fn, // The function that indicates the command is enabled
            //		date: fn, // The function to get the date associated with this action
            //		action: fn} // The function that implements the action
            prev: { text: 'prevText', status: 'prevStatus', // Previous month
                keystroke: { keyCode: 33 }, // Page up
                enabled: function (inst) {
                    var minDate = inst.curMinDate();
                    return (!minDate || $.datepick.add($.datepick.day(
					$.datepick._applyMonthsOffset($.datepick.add($.datepick.newDate(inst.drawDate),
					1 - inst.get('monthsToStep'), 'm'), inst), 1), -1, 'd').
					getTime() >= minDate.getTime());
                },
                date: function (inst) {
                    return $.datepick.day($.datepick._applyMonthsOffset($.datepick.add(
					$.datepick.newDate(inst.drawDate), -inst.get('monthsToStep'), 'm'), inst), 1);
                },
                action: function (inst) {
                    $.datepick.changeMonth(this, -inst.get('monthsToStep'));
                }
            },
            prevJump: { text: 'prevJumpText', status: 'prevJumpStatus', // Previous year
                keystroke: { keyCode: 33, ctrlKey: true }, // Ctrl + Page up
                enabled: function (inst) {
                    var minDate = inst.curMinDate();
                    return (!minDate || $.datepick.add($.datepick.day(
					$.datepick._applyMonthsOffset($.datepick.add($.datepick.newDate(inst.drawDate),
					1 - inst.get('monthsToJump'), 'm'), inst), 1), -1, 'd').
					getTime() >= minDate.getTime());
                },
                date: function (inst) {
                    return $.datepick.day($.datepick._applyMonthsOffset($.datepick.add(
					$.datepick.newDate(inst.drawDate), -inst.get('monthsToJump'), 'm'), inst), 1);
                },
                action: function (inst) {
                    $.datepick.changeMonth(this, -inst.get('monthsToJump'));
                }
            },
            next: { text: 'nextText', status: 'nextStatus', // Next month
                keystroke: { keyCode: 34 }, // Page down
                enabled: function (inst) {
                    var maxDate = inst.get('maxDate');
                    return (!maxDate || $.datepick.day($.datepick._applyMonthsOffset($.datepick.add(
					$.datepick.newDate(inst.drawDate), inst.get('monthsToStep'), 'm'), inst), 1).
					getTime() <= maxDate.getTime());
                },
                date: function (inst) {
                    return $.datepick.day($.datepick._applyMonthsOffset($.datepick.add(
					$.datepick.newDate(inst.drawDate), inst.get('monthsToStep'), 'm'), inst), 1);
                },
                action: function (inst) {
                    $.datepick.changeMonth(this, inst.get('monthsToStep'));
                }
            },
            nextJump: { text: 'nextJumpText', status: 'nextJumpStatus', // Next year
                keystroke: { keyCode: 34, ctrlKey: true }, // Ctrl + Page down
                enabled: function (inst) {
                    var maxDate = inst.get('maxDate');
                    return (!maxDate || $.datepick.day($.datepick._applyMonthsOffset($.datepick.add(
					$.datepick.newDate(inst.drawDate), inst.get('monthsToJump'), 'm'), inst), 1).
					getTime() <= maxDate.getTime());
                },
                date: function (inst) {
                    return $.datepick.day($.datepick._applyMonthsOffset($.datepick.add(
					$.datepick.newDate(inst.drawDate), inst.get('monthsToJump'), 'm'), inst), 1);
                },
                action: function (inst) {
                    $.datepick.changeMonth(this, inst.get('monthsToJump'));
                }
            },
            current: { text: 'currentText', status: 'currentStatus', // Current month
                keystroke: { keyCode: 36, ctrlKey: true }, // Ctrl + Home
                enabled: function (inst) {
                    var minDate = inst.curMinDate();
                    var maxDate = inst.get('maxDate');
                    var curDate = inst.selectedDates[0] || $.datepick.today();
                    return (!minDate || curDate.getTime() >= minDate.getTime()) &&
					(!maxDate || curDate.getTime() <= maxDate.getTime());
                },
                date: function (inst) {
                    return inst.selectedDates[0] || $.datepick.today();
                },
                action: function (inst) {
                    var curDate = inst.selectedDates[0] || $.datepick.today();
                    $.datepick.showMonth(this, curDate.getFullYear(), curDate.getMonth() + 1);
                }
            },
            today: { text: 'todayText', status: 'todayStatus', // Today's month
                keystroke: { keyCode: 36, ctrlKey: true }, // Ctrl + Home
                enabled: function (inst) {
                    var minDate = inst.curMinDate();
                    var maxDate = inst.get('maxDate');
                    return (!minDate || $.datepick.today().getTime() >= minDate.getTime()) &&
					(!maxDate || $.datepick.today().getTime() <= maxDate.getTime());
                },
                date: function (inst) { return $.datepick.today(); },
                action: function (inst) { $.datepick.showMonth(this); }
            },
            clear: { text: 'clearText', status: 'clearStatus', // Clear the datepicker
                keystroke: { keyCode: 35, ctrlKey: true }, // Ctrl + End
                enabled: function (inst) { return true; },
                date: function (inst) { return null; },
                action: function (inst) { $.datepick.clear(this); }
            },
            close: { text: 'closeText', status: 'closeStatus', // Close the datepicker
                keystroke: { keyCode: 27 }, // Escape
                enabled: function (inst) { return true; },
                date: function (inst) { return null; },
                action: function (inst) { $.datepick.hide(this); }
            },
            prevWeek: { text: 'prevWeekText', status: 'prevWeekStatus', // Previous week
                keystroke: { keyCode: 38, ctrlKey: true }, // Ctrl + Up
                enabled: function (inst) {
                    var minDate = inst.curMinDate();
                    return (!minDate || $.datepick.add($.datepick.newDate(inst.drawDate), -7, 'd').
					getTime() >= minDate.getTime());
                },
                date: function (inst) { return $.datepick.add($.datepick.newDate(inst.drawDate), -7, 'd'); },
                action: function (inst) { $.datepick.changeDay(this, -7); }
            },
            prevDay: { text: 'prevDayText', status: 'prevDayStatus', // Previous day
                keystroke: { keyCode: 37, ctrlKey: true }, // Ctrl + Left
                enabled: function (inst) {
                    var minDate = inst.curMinDate();
                    return (!minDate || $.datepick.add($.datepick.newDate(inst.drawDate), -1, 'd').
					getTime() >= minDate.getTime());
                },
                date: function (inst) { return $.datepick.add($.datepick.newDate(inst.drawDate), -1, 'd'); },
                action: function (inst) { $.datepick.changeDay(this, -1); }
            },
            nextDay: { text: 'nextDayText', status: 'nextDayStatus', // Next day
                keystroke: { keyCode: 39, ctrlKey: true }, // Ctrl + Right
                enabled: function (inst) {
                    var maxDate = inst.get('maxDate');
                    return (!maxDate || $.datepick.add($.datepick.newDate(inst.drawDate), 1, 'd').
					getTime() <= maxDate.getTime());
                },
                date: function (inst) { return $.datepick.add($.datepick.newDate(inst.drawDate), 1, 'd'); },
                action: function (inst) { $.datepick.changeDay(this, 1); }
            },
            nextWeek: { text: 'nextWeekText', status: 'nextWeekStatus', // Next week
                keystroke: { keyCode: 40, ctrlKey: true }, // Ctrl + Down
                enabled: function (inst) {
                    var maxDate = inst.get('maxDate');
                    return (!maxDate || $.datepick.add($.datepick.newDate(inst.drawDate), 7, 'd').
					getTime() <= maxDate.getTime());
                },
                date: function (inst) { return $.datepick.add($.datepick.newDate(inst.drawDate), 7, 'd'); },
                action: function (inst) { $.datepick.changeDay(this, 7); }
            }
        },

        /* Default template for generating a datepicker. */
        defaultRenderer: {
            // Anywhere: '{l10n:name}' to insert localised value for name,
            // '{link:name}' to insert a link trigger for command name,
            // '{button:name}' to insert a button trigger for command name,
            // '{popup:start}...{popup:end}' to mark a section for inclusion in a popup datepicker only,
            // '{inline:start}...{inline:end}' to mark a section for inclusion in an inline datepicker only
            // Overall structure: '{months}' to insert calendar months
            picker: '<div class="datepick">' +
		'<div class="datepick-nav">{link:prev}{link:today}{link:next}</div>{months}' +
		'{popup:start}<div class="datepick-ctrl">{link:clear}{link:close}</div>{popup:end}' +
		'<div class="datepick-clear-fix"></div></div>',
            // One row of months: '{months}' to insert calendar months
            monthRow: '<div class="datepick-month-row">{months}</div>',
            // A single month: '{monthHeader:dateFormat}' to insert the month header -
            // dateFormat is optional and defaults to 'MM yyyy',
            // '{weekHeader}' to insert a week header, '{weeks}' to insert the month's weeks
            month: '<div class="datepick-month"><div class="datepick-month-header">{monthHeader}</div>' +
		'<table><thead>{weekHeader}</thead><tbody>{weeks}</tbody></table></div>',
            // A week header: '{days}' to insert individual day names
            weekHeader: '<tr>{days}</tr>',
            // Individual day header: '{day}' to insert day name
            dayHeader: '<th>{day}</th>',
            // One week of the month: '{days}' to insert the week's days, '{weekOfYear}' to insert week of year
            week: '<tr>{days}</tr>',
            // An individual day: '{day}' to insert day value
            day: '<td>{day}</td>',
            // jQuery selector, relative to picker, for a single month
            monthSelector: '.datepick-month',
            // jQuery selector, relative to picker, for individual days
            daySelector: 'td',
            // Class for right-to-left (RTL) languages
            rtlClass: 'datepick-rtl',
            // Class for multi-month datepickers
            multiClass: 'datepick-multi',
            // Class for selectable dates
            defaultClass: '',
            // Class for currently selected dates
            selectedClass: 'datepick-selected',
            // Class for highlighted dates
            highlightedClass: 'datepick-highlight',
            // Class for today
            todayClass: 'datepick-today',
            // Class for days from other months
            otherMonthClass: 'datepick-other-month',
            // Class for days on weekends
            weekendClass: 'datepick-weekend',
            // Class prefix for commands
            commandClass: 'datepick-cmd',
            // Extra class(es) for commands that are buttons
            commandButtonClass: '',
            // Extra class(es) for commands that are links
            commandLinkClass: '',
            // Class for disabled commands
            disabledClass: 'datepick-disabled'
        },

        /* Override the default settings for all datepicker instances.
        @param  settings  (object) the new settings to use as defaults
        @return  (Datepicker) this object */
        setDefaults: function (settings) {
            $.extend(this._defaults, settings || {});
            return this;
        },

        _ticksTo1970: (((1970 - 1) * 365 + Math.floor(1970 / 4) - Math.floor(1970 / 100) +
		Math.floor(1970 / 400)) * 24 * 60 * 60 * 10000000),
        _msPerDay: 24 * 60 * 60 * 1000,

        ATOM: 'yyyy-mm-dd', // RFC 3339/ISO 8601
        COOKIE: 'D, dd M yyyy',
        FULL: 'DD, MM d, yyyy',
        ISO_8601: 'yyyy-mm-dd',
        JULIAN: 'J',
        RFC_822: 'D, d M yy',
        RFC_850: 'DD, dd-M-yy',
        RFC_1036: 'D, d M yy',
        RFC_1123: 'D, d M yyyy',
        RFC_2822: 'D, d M yyyy',
        RSS: 'D, d M yy', // RFC 822
        TICKS: '!',
        TIMESTAMP: '@',
        W3C: 'yyyy-mm-dd', // ISO 8601

        /* Format a date object into a string value.
        The format can be combinations of the following:
        d  - day of month (no leading zero)
        dd - day of month (two digit)
        o  - day of year (no leading zeros)
        oo - day of year (three digit)
        D  - day name short
        DD - day name long
        w  - week of year (no leading zero)
        ww - week of year (two digit)
        m  - month of year (no leading zero)
        mm - month of year (two digit)
        M  - month name short
        MM - month name long
        yy - year (two digit)
        yyyy - year (four digit)
        @  - Unix timestamp (s since 01/01/1970)
        !  - Windows ticks (100ns since 01/01/0001)
        '...' - literal text
        '' - single quote
        @param  format    (string) the desired format of the date (optional, default datepicker format)
        @param  date      (Date) the date value to format
        @param  settings  (object) attributes include:
        dayNamesShort    (string[]) abbreviated names of the days from Sunday (optional)
        dayNames         (string[]) names of the days from Sunday (optional)
        monthNamesShort  (string[]) abbreviated names of the months (optional)
        monthNames       (string[]) names of the months (optional)
        calculateWeek    (function) function that determines week of the year (optional)
        @return  (string) the date in the above format */
        formatDate: function (format, date, settings) {
            if (typeof format != 'string') {
                settings = date;
                date = format;
                format = '';
            }
            if (!date) {
                return '';
            }
            format = format || this._defaults.dateFormat;
            settings = settings || {};
            var dayNamesShort = settings.dayNamesShort || this._defaults.dayNamesShort;
            var dayNames = settings.dayNames || this._defaults.dayNames;
            var monthNamesShort = settings.monthNamesShort || this._defaults.monthNamesShort;
            var monthNames = settings.monthNames || this._defaults.monthNames;
            var calculateWeek = settings.calculateWeek || this._defaults.calculateWeek;
            // Check whether a format character is doubled
            var doubled = function (match, step) {
                var matches = 1;
                while (iFormat + matches < format.length && format.charAt(iFormat + matches) == match) {
                    matches++;
                }
                iFormat += matches - 1;
                return Math.floor(matches / (step || 1)) > 1;
            };
            // Format a number, with leading zeroes if necessary
            var formatNumber = function (match, value, len, step) {
                var num = '' + value;
                if (doubled(match, step)) {
                    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 (doubled(match) ? longNames[value] : shortNames[value]);
            };
            var output = '';
            var literal = false;
            for (var iFormat = 0; iFormat < format.length; iFormat++) {
                if (literal) {
                    if (format.charAt(iFormat) == "'" && !doubled("'")) {
                        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', this.dayOfYear(date), 3); break;
                        case 'w': output += formatNumber('w', calculateWeek(date), 2); break;
                        case 'm': output += formatNumber('m', date.getMonth() + 1, 2); break;
                        case 'M': output += formatName('M', date.getMonth(),
						monthNamesShort, monthNames); break;
                        case 'y':
                            output += (doubled('y', 2) ? date.getFullYear() :
							(date.getFullYear() % 100 < 10 ? '0' : '') + date.getFullYear() % 100);
                            break;
                        case '@': output += Math.floor(date.getTime() / 1000); break;
                        case '!': output += date.getTime() * 10000 + this._ticksTo1970; break;
                        case "'":
                            if (doubled("'")) {
                                output += "'";
                            }
                            else {
                                literal = true;
                            }
                            break;
                        default:
                            output += format.charAt(iFormat);
                    }
                }
            }
            return output;
        },

        /* Parse a string value into a date object.
        See formatDate for the possible formats, plus:
        * - ignore rest of string
        @param  format    (string) the expected format of the date ('' for default datepicker format)
        @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[]) abbreviated names of the days from Sunday (optional)
        dayNames         (string[]) names of the days from Sunday (optional)
        monthNamesShort  (string[]) abbreviated names of the months (optional)
        monthNames       (string[]) names of the months (optional)
        @return  (Date) the extracted date value or null if value is blank
        @throws  errors if the format and/or value are missing,
        if the value doesn't match the format,
        or if the date is invalid */
        parseDate: function (format, value, settings) {
            if (value == null) {
                throw 'Invalid arguments';
            }
            value = (typeof value == 'object' ? value.toString() : value + '');
            if (value == '') {
                return null;
            }
            format = format || this._defaults.dateFormat;
            settings = settings || {};
            var shortYearCutoff = settings.shortYearCutoff || this._defaults.shortYearCutoff;
            shortYearCutoff = (typeof shortYearCutoff != 'string' ? shortYearCutoff :
			this.today().getFullYear() % 100 + parseInt(shortYearCutoff, 10));
            var dayNamesShort = settings.dayNamesShort || this._defaults.dayNamesShort;
            var dayNames = settings.dayNames || this._defaults.dayNames;
            var monthNamesShort = settings.monthNamesShort || this._defaults.monthNamesShort;
            var monthNames = settings.monthNames || this._defaults.monthNames;
            var year = -1;
            var month = -1;
            var day = -1;
            var doy = -1;
            var shortYear = false;
            var literal = false;
            // Check whether a format character is doubled
            var doubled = function (match, step) {
                var matches = 1;
                while (iFormat + matches < format.length && format.charAt(iFormat + matches) == match) {
                    matches++;
                }
                iFormat += matches - 1;
                return Math.floor(matches / (step || 1)) > 1;
            };
            // Extract a number from the string value
            var getNumber = function (match, step) {
                var isDoubled = doubled(match, step);
                var size = [2, 3, isDoubled ? 4 : 2, 11, 20]['oy@!'.indexOf(match) + 1];
                var digits = new RegExp('^-?\\d{1,' + size + '}');
                var num = value.substring(iValue).match(digits);
                if (!num) {
                    throw 'Missing number at position {0}'.replace(/\{0\}/, 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, step) {
                var names = (doubled(match, step) ? longNames : shortNames);
                for (var i = 0; i < names.length; i++) {
                    if (value.substr(iValue, names[i].length) == names[i]) {
                        iValue += names[i].length;
                        return i + 1;
                    }
                }
                throw 'Unknown name at position {0}'.replace(/\{0\}/, 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 {0}'.replace(/\{0\}/, iValue);
                }
                iValue++;
            };
            var iValue = 0;
            for (var iFormat = 0; iFormat < format.length; iFormat++) {
                if (literal) {
                    if (format.charAt(iFormat) == "'" && !doubled("'")) {
                        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 'w': getNumber('w'); break;
                        case 'm': month = getNumber('m'); break;
                        case 'M': month = getName('M', monthNamesShort, monthNames); break;
                        case 'y':
                            var iSave = iFormat;
                            shortYear = !doubled('y', 2);
                            iFormat = iSave;
                            year = getNumber('y', 2);
                            break;
                        case '@':
                            var date = this._normaliseDate(new Date(getNumber('@') * 1000));
                            year = date.getFullYear();
                            month = date.getMonth() + 1;
                            day = date.getDate();
                            break;
                        case '!':
                            var date = this._normaliseDate(
							new Date((getNumber('!') - this._ticksTo1970) / 10000));
                            year = date.getFullYear();
                            month = date.getMonth() + 1;
                            day = date.getDate();
                            break;
                        case '*': iValue = value.length; break;
                        case "'":
                            if (doubled("'")) {
                                checkLiteral();
                            }
                            else {
                                literal = true;
                            }
                            break;
                        default: checkLiteral();
                    }
                }
            }
            if (iValue < value.length) {
                throw 'Additional text found at end';
            }
            if (year == -1) {
                year = this.today().getFullYear();
            }
            else if (year < 100 && shortYear) {
                year += (shortYearCutoff == -1 ? 1900 : this.today().getFullYear() -
				this.today().getFullYear() % 100 - (year <= shortYearCutoff ? 0 : 100));
            }
            if (doy > -1) {
                month = 1;
                day = doy;
                for (var dim = this.daysInMonth(year, month); day > dim;
					dim = this.daysInMonth(year, month)) {
                    month++;
                    day -= dim;
                }
            }
            var date = this.newDate(year, month, day);
            if (date.getFullYear() != year || date.getMonth() + 1 != month || date.getDate() != day) {
                throw 'Invalid date';
            }
            return date;
        },

        /* A date may be specified as an exact value or a relative one.
        @param  dateSpec     (Date or number or string) the date as an object or string
        in the given format or an offset - numeric days from today,
        or string amounts and periods, e.g. '+1m +2w'
        @param  defaultDate  (Date) the date to use if no other supplied, may be null
        @param  currentDate  (Date) the current date as a possible basis for relative dates,
        if null today is used (optional)
        @param  dateFormat   (string) the expected date format - see formatDate above (optional)
        @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 decoded date */
        determineDate: function (dateSpec, defaultDate, currentDate, dateFormat, settings) {
            if (currentDate && typeof currentDate != 'object') {
                settings = dateFormat;
                dateFormat = currentDate;
                currentDate = null;
            }
            if (typeof dateFormat != 'string') {
                settings = dateFormat;
                dateFormat = '';
            }
            var offsetString = function (offset) {
                try {
                    return $.datepick.parseDate(dateFormat, offset, settings);
                }
                catch (e) {
                    // Ignore
                }
                offset = offset.toLowerCase();
                var date = (offset.match(/^c/) && currentDate ? $.datepick.newDate(currentDate) : null) ||
				$.datepick.today();
                var pattern = /([+-]?[0-9]+)\s*(d|w|m|y)?/g;
                var matches = pattern.exec(offset);
                while (matches) {
                    date = $.datepick.add(date, parseInt(matches[1], 10), matches[2] || 'd');
                    matches = pattern.exec(offset);
                }
                return date;
            };
            defaultDate = (defaultDate ? $.datepick.newDate(defaultDate) : null);
            dateSpec = (dateSpec == null ? defaultDate :
			(typeof dateSpec == 'string' ? offsetString(dateSpec) : (typeof dateSpec == 'number' ?
			(isNaN(dateSpec) || dateSpec == Infinity || dateSpec == -Infinity ? defaultDate :
			$.datepick.add($.datepick.today(), dateSpec, 'd')) : $.datepick.newDate(dateSpec))));
            return dateSpec;
        },

        /* Find the number of days in a given month.
        @param  year   (Date) the date to get days for or
        (number) the full year
        @param  month  (number) the month (1 to 12)
        @return  (number) the number of days in this month */
        daysInMonth: function (year, month) {
            month = (year.getFullYear ? year.getMonth() + 1 : month);
            year = (year.getFullYear ? year.getFullYear() : year);
            return this.newDate(year, month + 1, 0).getDate();
        },

        /* Calculate the day of the year for a date.
        @param  year   (Date) the date to get the day-of-year for or
        (number) the full year
        @param  month  (number) the month (1-12)
        @param  day    (number) the day
        @return  (number) the day of the year */
        dayOfYear: function (year, month, day) {
            var date = (year.getFullYear ? year : this.newDate(year, month, day));
            var newYear = this.newDate(date.getFullYear(), 1, 1);
            return Math.floor((date.getTime() - newYear.getTime()) / this._msPerDay) + 1;
        },

        /* Set as calculateWeek to determine the week of the year based on the ISO 8601 definition.
        @param  year   (Date) the date to get the week for or
        (number) the full year
        @param  month  (number) the month (1-12)
        @param  day    (number) the day
        @return  (number) the number of the week within the year that contains this date */
        iso8601Week: function (year, month, day) {
            var checkDate = (year.getFullYear ?
			new Date(year.getTime()) : this.newDate(year, month, day));
            // Find Thursday of this week starting on Monday
            checkDate.setDate(checkDate.getDate() + 4 - (checkDate.getDay() || 7));
            var time = checkDate.getTime();
            checkDate.setMonth(0, 1); // Compare with Jan 1
            return Math.floor(Math.round((time - checkDate) / 86400000) / 7) + 1;
        },

        /* Return today's date.
        @return  (Date) today */
        today: function () {
            return this._normaliseDate(new Date());
        },

        /* Return a new date.
        @param  year   (Date) the date to clone or
        (number) the year
        @param  month  (number) the month (1-12)
        @param  day    (number) the day
        @return  (Date) the date */
        newDate: function (year, month, day) {
            return (!year ? null : (year.getFullYear ? this._normaliseDate(new Date(year.getTime())) :
			new Date(year, month - 1, day, 12)));
        },

        /* Standardise a date into a common format - time portion is 12 noon.
        @param  date  (Date) the date to standardise
        @return  (Date) the normalised date */
        _normaliseDate: function (date) {
            if (date) {
                date.setHours(12, 0, 0, 0);
            }
            return date;
        },

        /* Set the year for a date.
        @param  date  (Date) the original date
        @param  year  (number) the new year
        @return  the updated date */
        year: function (date, year) {
            date.setFullYear(year);
            return this._normaliseDate(date);
        },

        /* Set the month for a date.
        @param  date   (Date) the original date
        @param  month  (number) the new month (1-12)
        @return  the updated date */
        month: function (date, month) {
            date.setMonth(month - 1);
            return this._normaliseDate(date);
        },

        /* Set the day for a date.
        @param  date  (Date) the original date
        @param  day   (number) the new day of the month
        @return  the updated date */
        day: function (date, day) {
            date.setDate(day);
            return this._normaliseDate(date);
        },

        /* Add a number of periods to a date.
        @param  date    (Date) the original date
        @param  amount  (number) the number of periods
        @param  period  (string) the type of period d/w/m/y
        @return  the updated date */
        add: function (date, amount, period) {
            if (period == 'd' || period == 'w') {
                this._normaliseDate(date);
                date.setDate(date.getDate() + amount * (period == 'w' ? 7 : 1));
            }
            else {
                var year = date.getFullYear() + (period == 'y' ? amount : 0);
                var month = date.getMonth() + (period == 'm' ? amount : 0);
                date.setTime($.datepick.newDate(year, month + 1,
				Math.min(date.getDate(), this.daysInMonth(year, month + 1))).getTime());
            }
            return date;
        },

        /* Apply the months offset value to a date.
        @param  date  (Date) the original date
        @param  inst  (object) the current instance settings
        @return  (Date) the updated date */
        _applyMonthsOffset: function (date, inst) {
            var monthsOffset = inst.get('monthsOffset');
            if ($.isFunction(monthsOffset)) {
                monthsOffset = monthsOffset.apply(inst.target[0], [date]);
            }
            return $.datepick.add(date, -monthsOffset, 'm');
        },

        /* Attach the datepicker functionality to an input field.
        @param  target    (element) the control to affect
        @param  settings  (object) the custom options for this instance */
        _attachPicker: function (target, settings) {
            target = $(target);
            if (target.hasClass(this.markerClass)) {
                return;
            }
            target.addClass(this.markerClass);
            var inst = { target: target, selectedDates: [], drawDate: null, pickingRange: false,
                inline: ($.inArray(target[0].nodeName.toLowerCase(), ['div', 'span']) > -1),
                get: function (name) { // Get a setting value, defaulting if necessary
                    var value = this.settings[name] !== undefined ?
					this.settings[name] : $.datepick._defaults[name];
                    if ($.inArray(name, ['defaultDate', 'minDate', 'maxDate']) > -1) { // Decode date settings
                        value = $.datepick.determineDate(
						value, null, this.selectedDates[0], this.get('dateFormat'), inst.getConfig());
                    }
                    return value;
                },
                curMinDate: function () {
                    return (this.pickingRange ? this.selectedDates[0] : this.get('minDate'));
                },
                getConfig: function () {
                    return { dayNamesShort: this.get('dayNamesShort'), dayNames: this.get('dayNames'),
                        monthNamesShort: this.get('monthNamesShort'), monthNames: this.get('monthNames'),
                        calculateWeek: this.get('calculateWeek'),
                        shortYearCutoff: this.get('shortYearCutoff')
                    };
                }
            };
            $.data(target[0], this.dataName, inst);
            var inlineSettings = ($.fn.metadata ? target.metadata() : {});
            inst.settings = $.extend({}, settings || {}, inlineSettings || {});
            if (inst.inline) {
                inst.drawDate = $.datepick._checkMinMax($.datepick.newDate(inst.selectedDates[0] ||
				inst.get('defaultDate') || $.datepick.today()), inst);
                inst.prevDate = $.datepick.newDate(inst.drawDate);
                this._update(target[0]);
                if ($.fn.mousewheel) {
                    target.mousewheel(this._doMouseWheel);
                }
            }
            else {
                this._attachments(target, inst);
                target.bind('keydown.' + this.dataName, this._keyDown).
				bind('keypress.' + this.dataName, this._keyPress).
				bind('keyup.' + this.dataName, this._keyUp);
                if (target.attr('disabled')) {
                    this.disable(target[0]);
                }
            }
        },

        /* Retrieve the settings for a datepicker control.
        @param  target  (element) the control to affect
        @param  name    (string) the name of the setting (optional)
        @return  (object) the current instance settings (name == 'all') or
        (object) the default settings (no name) or
        (any) the setting value (name supplied) */
        options: function (target, name) {
            var inst = $.data(target, this.dataName);
            return (inst ? (name ? (name == 'all' ?
			inst.settings : inst.settings[name]) : $.datepick._defaults) : {});
        },

        /* Reconfigure the settings for a datepicker control.
        @param  target    (element) the control to affect
        @param  settings  (object) the new options for this instance or
        (string) an individual property name
        @param  value     (any) the individual property value (omit if settings is an object) */
        option: function (target, settings, value) {
            target = $(target);
            if (!target.hasClass(this.markerClass)) {
                return;
            }
            settings = settings || {};
            if (typeof settings == 'string') {
                var name = settings;
                settings = {};
                settings[name] = value;
            }
            var inst = $.data(target[0], this.dataName);
            var dates = inst.selectedDates;
            extendRemove(inst.settings, settings);
            this.setDate(target[0], dates, null, false, true);
            inst.pickingRange = false;
            inst.drawDate = $.datepick.newDate(this._checkMinMax(
			(settings.defaultDate ? inst.get('defaultDate') : inst.drawDate) ||
			inst.get('defaultDate') || $.datepick.today(), inst));
            if (!inst.inline) {
                this._attachments(target, inst);
            }
            if (inst.inline || inst.div) {
                this._update(target[0]);
            }
        },

        /* Attach events and trigger, if necessary.
        @param  target  (jQuery) the control to affect
        @param  inst    (object) the current instance settings */
        _attachments: function (target, inst) {
            target.unbind('focus.' + this.dataName);
            if (inst.get('showOnFocus')) {
                target.bind('focus.' + this.dataName, this.show);
            }
            if (inst.trigger) {
                inst.trigger.remove();
            }
            var trigger = inst.get('showTrigger');
            inst.trigger = (!trigger ? $([]) :
			$(trigger).clone().removeAttr('id').addClass(this._triggerClass)
				[inst.get('isRTL') ? 'insertBefore' : 'insertAfter'](target).
				click(function () {
				    if (!$.datepick.isDisabled(target[0])) {
				        $.datepick[$.datepick.curInst == inst ?
							'hide' : 'show'](target[0]);
				    }
				}));
            this._autoSize(target, inst);
            var dates = this._extractDates(inst, target.val());
            if (dates) {
                this.setDate(target[0], dates, null, true);
            }
            if (inst.get('selectDefaultDate') && inst.get('defaultDate') &&
				inst.selectedDates.length == 0) {
                this.setDate(target[0], $.datepick.newDate(inst.get('defaultDate') || $.datepick.today()));
            }
        },

        /* Apply the maximum length for the date format.
        @param  inst  (object) the current instance settings */
        _autoSize: function (target, inst) {
            if (inst.get('autoSize') && !inst.inline) {
                var date = $.datepick.newDate(2009, 10, 20); // Ensure double digits
                var dateFormat = inst.get('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(inst.get(dateFormat.match(/MM/) ? // Longest month
					'monthNames' : 'monthNamesShort')));
                    date.setDate(findMax(inst.get(dateFormat.match(/DD/) ? // Longest day
					'dayNames' : 'dayNamesShort')) + 20 - date.getDay());
                }
                inst.target.attr('size', $.datepick.formatDate(dateFormat, date, inst.getConfig()).length);
            }
        },

        /* Remove the datepicker functionality from a control.
        @param  target  (element) the control to affect */
        destroy: function (target) {
            target = $(target);
            if (!target.hasClass(this.markerClass)) {
                return;
            }
            var inst = $.data(target[0], this.dataName);
            if (inst.trigger) {
                inst.trigger.remove();
            }
            target.removeClass(this.markerClass).empty().unbind('.' + this.dataName);
            if (inst.inline && $.fn.mousewheel) {
                target.unmousewheel();
            }
            if (!inst.inline && inst.get('autoSize')) {
                target.removeAttr('size');
            }
            $.removeData(target[0], this.dataName);
        },

        /* Apply multiple event functions.
        Usage, for example: onShow: multipleEvents(fn1, fn2, ...)
        @param  fns  (function...) the functions to apply */
        multipleEvents: function (fns) {
            var funcs = arguments;
            return function (args) {
                for (var i = 0; i < funcs.length; i++) {
                    funcs[i].apply(this, arguments);
                }
            };
        },

        /* Enable the datepicker and any associated trigger.
        @param  target  (element) the control to use */
        enable: function (target) {
            var $target = $(target);
            if (!$target.hasClass(this.markerClass)) {
                return;
            }
            var inst = $.data(target, this.dataName);
            if (inst.inline)
                $target.children('.' + this._disableClass).remove().end().
				find('button,select').attr('disabled', '').end().
				find('a').attr('href', 'javascript:void(0)');
            else {
                target.disabled = false;
                inst.trigger.filter('button.' + this._triggerClass).
				attr('disabled', '').end().
				filter('img.' + this._triggerClass).
				css({ opacity: '1.0', cursor: '' });
            }
            this._disabled = $.map(this._disabled,
			function (value) { return (value == target ? null : value); }); // Delete entry
        },

        /* Disable the datepicker and any associated trigger.
        @param  target  (element) the control to use */
        disable: function (target) {
            var $target = $(target);
            if (!$target.hasClass(this.markerClass))
                return;
            var inst = $.data(target, this.dataName);
            if (inst.inline) {
                var inline = $target.children(':last');
                var offset = inline.offset();
                var relOffset = { left: 0, top: 0 };
                inline.parents().each(function () {
                    if ($(this).css('position') == 'relative') {
                        relOffset = $(this).offset();
                        return false;
                    }
                });
                var zIndex = $target.css('zIndex');
                zIndex = (zIndex == 'auto' ? 0 : parseInt(zIndex, 10)) + 1;
                $target.prepend('<div class="' + this._disableClass + '" style="' +
				'width: ' + inline.outerWidth() + 'px; height: ' + inline.outerHeight() +
				'px; left: ' + (offset.left - relOffset.left) + 'px; top: ' +
				(offset.top - relOffset.top) + 'px; z-index: ' + zIndex + '"></div>').
				find('button,select').attr('disabled', 'disabled').end().
				find('a').removeAttr('href');
            }
            else {
                target.disabled = true;
                inst.trigger.filter('button.' + this._triggerClass).
				attr('disabled', 'disabled').end().
				filter('img.' + this._triggerClass).
				css({ opacity: '0.5', cursor: 'default' });
            }
            this._disabled = $.map(this._disabled,
			function (value) { return (value == target ? null : value); }); // Delete entry
            this._disabled.push(target);
        },

        /* Is the first field in a jQuery collection disabled as a datepicker?
        @param  target  (element) the control to examine
        @return  (boolean) true if disabled, false if enabled */
        isDisabled: function (target) {
            return (target && $.inArray(target, this._disabled) > -1);
        },

        /* Show a popup datepicker.
        @param  target  (event) a focus event or
        (element) the control to use */
        show: function (target) {
            target = target.target || target;
            var inst = $.data(target, $.datepick.dataName);
            if ($.datepick.curInst == inst) {
                return;
            }
            if ($.datepick.curInst) {
                $.datepick.hide($.datepick.curInst, true);
            }
            if (inst) {
                // Retrieve existing date(s)
                inst.lastVal = null;
                inst.selectedDates = $.datepick._extractDates(inst, $(target).val());
                inst.pickingRange = false;
                inst.drawDate = $.datepick._checkMinMax($.datepick.newDate(inst.selectedDates[0] ||
				inst.get('defaultDate') || $.datepick.today()), inst);
                inst.prevDate = $.datepick.newDate(inst.drawDate);
                $.datepick.curInst = inst;
                // Generate content
                $.datepick._update(target, true);
                // Adjust position before showing
                var offset = $.datepick._checkOffset(inst);
                inst.div.css({ left: offset.left, top: offset.top });
                // And display
                var showAnim = inst.get('showAnim');
                var showSpeed = inst.get('showSpeed');
                showSpeed = (showSpeed == 'normal' && $.ui && $.ui.version >= '1.8' ?
				'_default' : showSpeed);
                var postProcess = function () {
                    var cover = inst.div.find('.' + $.datepick._coverClass);
                    if (cover.length) {
                        var borders = $.datepick._getBorders(inst.div);
                        cover.css({ left: -borders[0], top: -borders[1], // IE6- only
                            width: inst.div.outerWidth() + borders[0],
                            height: inst.div.outerHeight() + borders[1]
                        });
                    }
                };
                if ($.effects && $.effects[showAnim]) {
                    var data = inst.div.data(); // Update old effects data
                    for (var key in data) {
                        if (key.match(/^ec\.storage\./)) {
                            data[key] = inst._mainDiv.css(key.replace(/ec\.storage\./, ''));
                        }
                    }
                    inst.div.data(data).show(showAnim, inst.get('showOptions'), showSpeed, postProcess);
                }
                else {
                    inst.div[showAnim || 'show']((showAnim ? showSpeed : ''), postProcess);
                }
                if (!showAnim) {
                    postProcess();
                }
            }
        },

        /* Extract possible dates from a string.
        @param  inst  (object) the current instance settings
        @param  text  (string) the text to extract from
        @return  (CDate[]) the extracted dates */
        _extractDates: function (inst, datesText) {
            if (datesText == inst.lastVal) {
                return;
            }
            inst.lastVal = datesText;
            var dateFormat = inst.get('dateFormat');
            var multiSelect = inst.get('multiSelect');
            var rangeSelect = inst.get('rangeSelect');
            datesText = datesText.split(multiSelect ? inst.get('multiSeparator') :
			(rangeSelect ? inst.get('rangeSeparator') : '\x00'));
            var dates = [];
            for (var i = 0; i < datesText.length; i++) {
                try {
                    var date = $.datepick.parseDate(dateFormat, datesText[i], inst.getConfig());
                    if (date) {
                        var found = false;
                        for (var j = 0; j < dates.length; j++) {
                            if (dates[j].getTime() == date.getTime()) {
                                found = true;
                                break;
                            }
                        }
                        if (!found) {
                            dates.push(date);
                        }
                    }
                }
                catch (e) {
                    // Ignore
                }
            }
            dates.splice(multiSelect || (rangeSelect ? 2 : 1), dates.length);
            if (rangeSelect && dates.length == 1) {
                dates[1] = dates[0];
            }
            return dates;
        },

        /* Update the datepicker display.
        @param  target  (event) a focus event or
        (element) the control to use
        @param  hidden  (boolean) true to initially hide the datepicker */
        _update: function (target, hidden) {
            target = $(target.target || target);
            var inst = $.data(target[0], $.datepick.dataName);
            if (inst) {
                if (inst.inline || $.datepick.curInst == inst) {
                    var onChange = inst.get('onChangeMonthYear');
                    if (onChange && (!inst.prevDate ||
						inst.prevDate.getFullYear() != inst.drawDate.getFullYear() ||
						inst.prevDate.getMonth() != inst.drawDate.getMonth())) {
                        onChange.apply(target[0], [inst.drawDate.getFullYear(), inst.drawDate.getMonth() + 1]);
                    }
                }
                if (inst.inline) {
                    target.html(this._generateContent(target[0], inst));
                }
                else if ($.datepick.curInst == inst) {
                    if (!inst.div) {
                        inst.div = $('<div></div>').addClass(this._popupClass).
						css({ display: (hidden ? 'none' : 'static'), position: 'absolute',
						    left: target.offset().left,
						    top: target.offset().top + target.outerHeight()
						}).
						appendTo($(inst.get('popupContainer') || 'body'));
                        if ($.fn.mousewheel) {
                            inst.div.mousewheel(this._doMouseWheel);
                        }
                    }
                    inst.div.html(this._generateContent(target[0], inst));
                    target.focus();
                }
            }
        },

        /* Update the input field and any alternate field with the current dates.
        @param  target  (element) the control to use
        @param  keyUp   (boolean, internal) true if coming from keyUp processing */
        _updateInput: function (target, keyUp) {
            var inst = $.data(target, this.dataName);
            if (inst) {
                var value = '';
                var altValue = '';
                var sep = (inst.get('multiSelect') ? inst.get('multiSeparator') :
				inst.get('rangeSeparator'));
                var dateFormat = inst.get('dateFormat');
                var altFormat = inst.get('altFormat') || dateFormat;
                for (var i = 0; i < inst.selectedDates.length; i++) {
                    value += (keyUp ? '' : (i > 0 ? sep : '') + $.datepick.formatDate(
					dateFormat, inst.selectedDates[i], inst.getConfig()));
                    altValue += (i > 0 ? sep : '') + $.datepick.formatDate(
					altFormat, inst.selectedDates[i], inst.getConfig());
                }
                if (!inst.inline && !keyUp) {
                    $(target).val(value);
                }
                $(inst.get('altField')).val(altValue);
                var onSelect = inst.get('onSelect');
                if (onSelect && !keyUp && !inst.inSelect) {
                    inst.inSelect = true; // Prevent endless loops
                    onSelect.apply(target, [inst.selectedDates]);
                    inst.inSelect = false;
                }
            }
        },

        /* Retrieve the size of left and top borders for an element.
        @param  elem  (jQuery) the element of interest
        @return  (number[2]) the left and top borders */
        _getBorders: function (elem) {
            var convert = function (value) {
                var extra = ($.browser.msie ? 1 : 0);
                return { thin: 1 + extra, medium: 3 + extra, thick: 5 + extra}[value] || value;
            };
            return [parseFloat(convert(elem.css('border-left-width'))),
			parseFloat(convert(elem.css('border-top-width')))];
        },

        /* Check positioning to remain on the screen.
        @param  inst  (object) the current instance settings
        @return  (object) the updated offset for the datepicker */
        _checkOffset: function (inst) {
            var base = (inst.target.is(':hidden') && inst.trigger ? inst.trigger : inst.target);
            var offset = base.offset();
            var isFixed = false;
            $(inst.target).parents().each(function () {
                isFixed |= $(this).css('position') == 'fixed';
                return !isFixed;
            });
            if (isFixed && $.browser.opera) { // Correction for Opera when fixed and scrolled
                offset.left -= document.documentElement.scrollLeft;
                offset.top -= document.documentElement.scrollTop;
            }
            var browserWidth = (!$.browser.mozilla || document.doctype ?
			document.documentElement.clientWidth : 0) || document.body.clientWidth;
            var browserHeight = (!$.browser.mozilla || document.doctype ?
			document.documentElement.clientHeight : 0) || document.body.clientHeight;
            if (browserWidth == 0) {
                return offset;
            }
            var alignment = inst.get('alignment');
            var isRTL = inst.get('isRTL');
            var scrollX = document.documentElement.scrollLeft || document.body.scrollLeft;
            var scrollY = document.documentElement.scrollTop || document.body.scrollTop;
            var above = offset.top - inst.div.outerHeight() -
			(isFixed && $.browser.opera ? document.documentElement.scrollTop : 0);
            var below = offset.top + base.outerHeight();
            var alignL = offset.left;
            var alignR = offset.left + base.outerWidth() - inst.div.outerWidth() -
			(isFixed && $.browser.opera ? document.documentElement.scrollLeft : 0);
            var tooWide = (offset.left + inst.div.outerWidth() - scrollX) > browserWidth;
            var tooHigh = (offset.top + inst.target.outerHeight() + inst.div.outerHeight() -
			scrollY) > browserHeight;
            if (alignment == 'topLeft') {
                offset = { left: alignL, top: above };
            }
            else if (alignment == 'topRight') {
                offset = { left: alignR, top: above };
            }
            else if (alignment == 'bottomLeft') {
                offset = { left: alignL, top: below };
            }
            else if (alignment == 'bottomRight') {
                offset = { left: alignR, top: below };
            }
            else if (alignment == 'top') {
                offset = { left: (isRTL || tooWide ? alignR : alignL), top: above };
            }
            else { // bottom
                offset = { left: (isRTL || tooWide ? alignR : alignL),
                    top: (tooHigh ? above : below)
                };
            }
            offset.left = Math.max((isFixed ? 0 : scrollX), offset.left - (isFixed ? scrollX : 0));
            offset.top = Math.max((isFixed ? 0 : scrollY), offset.top - (isFixed ? scrollY : 0));
            return offset;
        },

        /* Close date picker if clicked elsewhere.
        @param  event  (MouseEvent) the mouse click to check */
        _checkExternalClick: function (event) {
            if (!$.datepick.curInst) {
                return;
            }
            var target = $(event.target);
            if (!target.parents().andSelf().hasClass($.datepick._popupClass) &&
				!target.hasClass($.datepick.markerClass) &&
				!target.parents().andSelf().hasClass($.datepick._triggerClass)) {
                $.datepick.hide($.datepick.curInst);
            }
        },

        /* Hide a popup datepicker.
        @param  target     (element) the control to use or
        (object) the current instance settings
        @param  immediate  (boolean) true to close immediately without animation */
        hide: function (target, immediate) {
            var inst = $.data(target, this.dataName) || target;
            if (inst && inst == $.datepick.curInst) {
                var showAnim = (immediate ? '' : inst.get('showAnim'));
                var showSpeed = inst.get('showSpeed');
                showSpeed = (showSpeed == 'normal' && $.ui && $.ui.version >= '1.8' ?
				'_default' : showSpeed);
                var postProcess = function () {
                    inst.div.remove();
                    inst.div = null;
                    $.datepick.curInst = null;
                    var onClose = inst.get('onClose');
                    if (onClose) {
                        onClose.apply(target, [inst.selectedDates]);
                    }
                };
                inst.div.stop();
                if ($.effects && $.effects[showAnim]) {
                    inst.div.hide(showAnim, inst.get('showOptions'), showSpeed, postProcess);
                }
                else {
                    var hideAnim = (showAnim == 'slideDown' ? 'slideUp' :
					(showAnim == 'fadeIn' ? 'fadeOut' : 'hide'));
                    inst.div[hideAnim]((showAnim ? showSpeed : ''), postProcess);
                }
                if (!showAnim) {
                    postProcess();
                }
            }
        },

        /* Handle keystrokes in the datepicker.
        @param  event  (KeyEvent) the keystroke
        @return  (boolean) true if not handled, false if handled */
        _keyDown: function (event) {
            var target = event.target;
            var inst = $.data(target, $.datepick.dataName);
            var handled = false;
            if (inst.div) {
                if (event.keyCode == 9) { // Tab - close
                    $.datepick.hide(target);
                }
                else if (event.keyCode == 13) { // Enter - select
                    $.datepick.selectDate(target,
					$('a.' + inst.get('renderer').highlightedClass, inst.div)[0]);
                    handled = true;
                }
                else { // Command keystrokes
                    var commands = inst.get('commands');
                    for (var name in commands) {
                        var command = commands[name];
                        if (command.keystroke.keyCode == event.keyCode &&
							!!command.keystroke.ctrlKey == !!(event.ctrlKey || event.metaKey) &&
							!!command.keystroke.altKey == event.altKey &&
							!!command.keystroke.shiftKey == event.shiftKey) {
                            $.datepick.performAction(target, name);
                            handled = true;
                            break;
                        }
                    }
                }
            }
            else { // Show on 'current' keystroke
                var command = inst.get('commands').current;
                if (command.keystroke.keyCode == event.keyCode &&
					!!command.keystroke.ctrlKey == !!(event.ctrlKey || event.metaKey) &&
					!!command.keystroke.altKey == event.altKey &&
					!!command.keystroke.shiftKey == event.shiftKey) {
                    $.datepick.show(target);
                    handled = true;
                }
            }
            inst.ctrlKey = ((event.keyCode < 48 && event.keyCode != 32) ||
			event.ctrlKey || event.metaKey);
            if (handled) {
                event.preventDefault();
                event.stopPropagation();
            }
            return !handled;
        },

        /* Filter keystrokes in the datepicker.
        @param  event  (KeyEvent) the keystroke
        @return  (boolean) true if allowed, false if not allowed */
        _keyPress: function (event) {
            var target = event.target;
            var inst = $.data(target, $.datepick.dataName);
            if (inst && inst.get('constrainInput')) {
                var ch = String.fromCharCode(event.keyCode || event.charCode);
                var allowedChars = $.datepick._allowedChars(inst);
                return (event.metaKey || inst.ctrlKey || ch < ' ' ||
				!allowedChars || allowedChars.indexOf(ch) > -1);
            }
            return true;
        },

        /* Determine the set of characters allowed by the date format.
        @param  inst  (object) the current instance settings
        @return  (string) the set of allowed characters, or null if anything allowed */
        _allowedChars: function (inst) {
            var dateFormat = inst.get('dateFormat');
            var allowedChars = (inst.get('multiSelect') ? inst.get('multiSeparator') :
			(inst.get('rangeSelect') ? inst.get('rangeSeparator') : ''));
            var literal = false;
            var hasNum = false;
            for (var i = 0; i < dateFormat.length; i++) {
                var ch = dateFormat.charAt(i);
                if (literal) {
                    if (ch == "'" && dateFormat.charAt(i + 1) != "'") {
                        literal = false;
                    }
                    else {
                        allowedChars += ch;
                    }
                }
                else {
                    switch (ch) {
                        case 'd': case 'm': case 'o': case 'w':
                            allowedChars += (hasNum ? '' : '0123456789'); hasNum = true; break;
                        case 'y': case '@': case '!':
                            allowedChars += (hasNum ? '' : '0123456789') + '-'; hasNum = true; break;
                        case 'J':
                            allowedChars += (hasNum ? '' : '0123456789') + '-.'; hasNum = true; break;
                        case 'D': case 'M': case 'Y':
                            return null; // Accept anything
                        case "'":
                            if (dateFormat.charAt(i + 1) == "'") {
                                allowedChars += "'";
                            }
                            else {
                                literal = true;
                            }
                            break;
                        default:
                            allowedChars += ch;
                    }
                }
            }
            return allowedChars;
        },

        /* Synchronise datepicker with the field.
        @param  event  (KeyEvent) the keystroke
        @return  (boolean) true if allowed, false if not allowed */
        _keyUp: function (event) {
            var target = event.target;
            var inst = $.data(target, $.datepick.dataName);
            if (inst && !inst.ctrlKey && inst.lastVal != inst.target.val()) {
                try {
                    var dates = $.datepick._extractDates(inst, inst.target.val());
                    if (dates.length > 0) {
                        $.datepick.setDate(target, dates, null, true);
                    }
                }
                catch (event) {
                    // Ignore
                }
            }
            return true;
        },

        /* Increment/decrement month/year on mouse wheel activity.
        @param  event  (event) the mouse wheel event
        @param  delta  (number) the amount of change */
        _doMouseWheel: function (event, delta) {
            var target = ($.datepick.curInst && $.datepick.curInst.target[0]) ||
			$(event.target).closest('.' + $.datepick.markerClass)[0];
            if ($.datepick.isDisabled(target)) {
                return;
            }
            var inst = $.data(target, $.datepick.dataName);
            if (inst.get('useMouseWheel')) {
                delta = ($.browser.opera ? -delta : delta);
                delta = (delta < 0 ? -1 : +1);
                $.datepick.changeMonth(target,
				-inst.get(event.ctrlKey ? 'monthsToJump' : 'monthsToStep') * delta);
            }
            event.preventDefault();
        },

        /* Clear an input and close a popup datepicker.
        @param  target  (element) the control to use */
        clear: function (target) {
            var inst = $.data(target, this.dataName);
            if (inst) {
                inst.selectedDates = [];
                this.hide(target);
                if (inst.get('selectDefaultDate') && inst.get('defaultDate')) {
                    this.setDate(target,
					$.datepick.newDate(inst.get('defaultDate') || $.datepick.today()));
                }
                else {
                    this._updateInput(target);
                }
            }
        },

        /* Retrieve the selected date(s) for a datepicker.
        @param  target  (element) the control to examine
        @return  (CDate[]) the selected date(s) */
        getDate: function (target) {
            var inst = $.data(target, this.dataName);
            return (inst ? inst.selectedDates : []);
        },

        /* Set the selected date(s) for a datepicker.
        @param  target   (element) the control to examine
        @param  dates    (CDate or number or string or [] of these) the selected date(s)
        @param  endDate  (CDate or number or string) the ending date for a range (optional)
        @param  keyUp    (boolean, internal) true if coming from keyUp processing
        @param  setOpt   (boolean, internal) true if coming from option processing */
        setDate: function (target, dates, endDate, keyUp, setOpt) {
            var inst = $.data(target, this.dataName);
            if (inst) {
                if (!$.isArray(dates)) {
                    dates = [dates];
                    if (endDate) {
                        dates.push(endDate);
                    }
                }
                var dateFormat = inst.get('dateFormat');
                var minDate = inst.get('minDate');
                var maxDate = inst.get('maxDate');
                var curDate = inst.selectedDates[0];
                inst.selectedDates = [];
                for (var i = 0; i < dates.length; i++) {
                    var date = $.datepick.determineDate(
					dates[i], null, curDate, dateFormat, inst.getConfig());
                    if (date) {
                        if ((!minDate || date.getTime() >= minDate.getTime()) &&
							(!maxDate || date.getTime() <= maxDate.getTime())) {
                            var found = false;
                            for (var j = 0; j < inst.selectedDates.length; j++) {
                                if (inst.selectedDates[j].getTime() == date.getTime()) {
                                    found = true;
                                    break;
                                }
                            }
                            if (!found) {
                                inst.selectedDates.push(date);
                            }
                        }
                    }
                }
                var rangeSelect = inst.get('rangeSelect');
                inst.selectedDates.splice(inst.get('multiSelect') ||
				(rangeSelect ? 2 : 1), inst.selectedDates.length);
                if (rangeSelect) {
                    switch (inst.selectedDates.length) {
                        case 1: inst.selectedDates[1] = inst.selectedDates[0]; break;
                        case 2: inst.selectedDates[1] =
						(inst.selectedDates[0].getTime() > inst.selectedDates[1].getTime() ?
						inst.selectedDates[0] : inst.selectedDates[1]); break;
                    }
                    inst.pickingRange = false;
                }
                inst.prevDate = (inst.drawDate ? $.datepick.newDate(inst.drawDate) : null);
                inst.drawDate = this._checkMinMax($.datepick.newDate(inst.selectedDates[0] ||
				inst.get('defaultDate') || $.datepick.today()), inst);
                if (!setOpt) {
                    this._update(target);
                    this._updateInput(target, keyUp);
                }
            }
        },

        /* Determine whether a date is selectable for this datepicker.
        @param  target  (element) the control to check
        @param  date    (Date or string or number) the date to check
        @return  (boolean) true if selectable, false if not */
        isSelectable: function (target, date) {
            var inst = $.data(target, this.dataName);
            if (!inst) {
                return false;
            }
            date = $.datepick.determineDate(date, inst.selectedDates[0] || this.today(), null,
			inst.get('dateFormat'), inst.getConfig());
            return this._isSelectable(target, date, inst.get('onDate'),
			inst.get('minDate'), inst.get('maxDate'));
        },

        /* Internally determine whether a date is selectable for this datepicker.
        @param  target   (element) the control to check
        @param  date     (Date) the date to check
        @param  onDate   (function or boolean) any onDate callback or callback.selectable
        @param  mindate  (Date) the minimum allowed date
        @param  maxdate  (Date) the maximum allowed date
        @return  (boolean) true if selectable, false if not */
        _isSelectable: function (target, date, onDate, minDate, maxDate) {
            var dateInfo = (typeof onDate == 'boolean' ? { selectable: onDate} :
			(!onDate ? {} : onDate.apply(target, [date, true])));
            return (dateInfo.selectable != false) &&
			(!minDate || date.getTime() >= minDate.getTime()) &&
			(!maxDate || date.getTime() <= maxDate.getTime());
        },

        /* Perform a named action for a datepicker.
        @param  target  (element) the control to affect
        @param  action  (string) the name of the action */
        performAction: function (target, action) {
            var inst = $.data(target, this.dataName);
            if (inst && !this.isDisabled(target)) {
                var commands = inst.get('commands');
                if (commands[action] && commands[action].enabled.apply(target, [inst])) {
                    commands[action].action.apply(target, [inst]);
                }
            }
        },

        /* Set the currently shown month, defaulting to today's.
        @param  target  (element) the control to affect
        @param  year    (number) the year to show (optional)
        @param  month   (number) the month to show (1-12) (optional)
        @param  day     (number) the day to show (optional) */
        showMonth: function (target, year, month, day) {
            var inst = $.data(target, this.dataName);
            if (inst && (day != null ||
				(inst.drawDate.getFullYear() != year || inst.drawDate.getMonth() + 1 != month))) {
                inst.prevDate = $.datepick.newDate(inst.drawDate);
                var show = this._checkMinMax((year != null ?
				$.datepick.newDate(year, month, 1) : $.datepick.today()), inst);
                inst.drawDate = $.datepick.newDate(show.getFullYear(), show.getMonth() + 1,
				(day != null ? day : Math.min(inst.drawDate.getDate(),
				$.datepick.daysInMonth(show.getFullYear(), show.getMonth() + 1))));
                this._update(target);
            }
        },

        /* Adjust the currently shown month.
        @param  target  (element) the control to affect
        @param  offset  (number) the number of months to change by */
        changeMonth: function (target, offset) {
            var inst = $.data(target, this.dataName);
            if (inst) {
                var date = $.datepick.add($.datepick.newDate(inst.drawDate), offset, 'm');
                this.showMonth(target, date.getFullYear(), date.getMonth() + 1);
            }
        },

        /* Adjust the currently shown day.
        @param  target  (element) the control to affect
        @param  offset  (number) the number of days to change by */
        changeDay: function (target, offset) {
            var inst = $.data(target, this.dataName);
            if (inst) {
                var date = $.datepick.add($.datepick.newDate(inst.drawDate), offset, 'd');
                this.showMonth(target, date.getFullYear(), date.getMonth() + 1, date.getDate());
            }
        },

        /* Restrict a date to the minimum/maximum specified.
        @param  date  (CDate) the date to check
        @param  inst  (object) the current instance settings */
        _checkMinMax: function (date, inst) {
            var minDate = inst.get('minDate');
            var maxDate = inst.get('maxDate');
            date = (minDate && date.getTime() < minDate.getTime() ? $.datepick.newDate(minDate) : date);
            date = (maxDate && date.getTime() > maxDate.getTime() ? $.datepick.newDate(maxDate) : date);
            return date;
        },

        /* Retrieve the date associated with an entry in the datepicker.
        @param  target  (element) the control to examine
        @param  elem    (element) the selected datepicker element
        @return  (CDate) the corresponding date, or null */
        retrieveDate: function (target, elem) {
            var inst = $.data(target, this.dataName);
            return (!inst ? null : this._normaliseDate(
			new Date(parseInt(elem.className.replace(/^.*dp(-?\d+).*$/, '$1'), 10))));
        },

        /* Select a date for this datepicker.
        @param  target  (element) the control to examine
        @param  elem    (element) the selected datepicker element */
        selectDate: function (target, elem) {
            var inst = $.data(target, this.dataName);
            if (inst && !this.isDisabled(target)) {
                var date = this.retrieveDate(target, elem);
                var multiSelect = inst.get('multiSelect');
                var rangeSelect = inst.get('rangeSelect');
                if (multiSelect) {
                    var found = false;
                    for (var i = 0; i < inst.selectedDates.length; i++) {
                        if (date.getTime() == inst.selectedDates[i].getTime()) {
                            inst.selectedDates.splice(i, 1);
                            found = true;
                            break;
                        }
                    }
                    if (!found && inst.selectedDates.length < multiSelect) {
                        inst.selectedDates.push(date);
                    }
                }
                else if (rangeSelect) {
                    if (inst.pickingRange) {
                        inst.selectedDates[1] = date;
                    }
                    else {
                        inst.selectedDates = [date, date];
                    }
                    inst.pickingRange = !inst.pickingRange;
                }
                else {
                    inst.selectedDates = [date];
                }
                inst.prevDate = $.datepick.newDate(date);
                this._updateInput(target);
                if (inst.inline || inst.pickingRange || inst.selectedDates.length <
					(multiSelect || (rangeSelect ? 2 : 1))) {
                    this._update(target);
                }
                else {
                    this.hide(target);
                }
            }
        },

        /* Generate the datepicker content for this control.
        @param  target  (element) the control to affect
        @param  inst    (object) the current instance settings
        @return  (jQuery) the datepicker content */
        _generateContent: function (target, inst) {
            var renderer = inst.get('renderer');
            var monthsToShow = inst.get('monthsToShow');
            monthsToShow = ($.isArray(monthsToShow) ? monthsToShow : [1, monthsToShow]);
            inst.drawDate = this._checkMinMax(
			inst.drawDate || inst.get('defaultDate') || $.datepick.today(), inst);
            var drawDate = $.datepick._applyMonthsOffset($.datepick.newDate(inst.drawDate), inst);
            // Generate months
            var monthRows = '';
            for (var row = 0; row < monthsToShow[0]; row++) {
                var months = '';
                for (var col = 0; col < monthsToShow[1]; col++) {
                    months += this._generateMonth(target, inst, drawDate.getFullYear(),
					drawDate.getMonth() + 1, renderer, (row == 0 && col == 0));
                    $.datepick.add(drawDate, 1, 'm');
                }
                monthRows += this._prepare(renderer.monthRow, inst).replace(/\{months\}/, months);
            }
            var picker = this._prepare(renderer.picker, inst).replace(/\{months\}/, monthRows).
			replace(/\{weekHeader\}/g, this._generateDayHeaders(inst, renderer)) +
			($.browser.msie && parseInt($.browser.version, 10) < 7 && !inst.inline ?
			'<iframe src="javascript:void(0);" class="' + this._coverClass + '"></iframe>' : '');
            // Add commands
            var commands = inst.get('commands');
            var asDateFormat = inst.get('commandsAsDateFormat');
            var addCommand = function (type, open, close, name, classes) {
                if (picker.indexOf('{' + type + ':' + name + '}') == -1) {
                    return;
                }
                var command = commands[name];
                var date = (asDateFormat ? command.date.apply(target, [inst]) : null);
                picker = picker.replace(new RegExp('\\{' + type + ':' + name + '\\}', 'g'),
				'<' + open +
				(command.status ? ' title="' + inst.get(command.status) + '"' : '') +
				' class="' + renderer.commandClass + ' ' +
				renderer.commandClass + '-' + name + ' ' + classes +
				(command.enabled(inst) ? '' : ' ' + renderer.disabledClass) + '">' +
				(date ? $.datepick.formatDate(inst.get(command.text), date, inst.getConfig()) :
				inst.get(command.text)) + '</' + close + '>');
            };
            for (var name in commands) {
                addCommand('button', 'button type="button"', 'button', name,
				renderer.commandButtonClass);
                addCommand('link', 'a href="javascript:void(0)"', 'a', name,
				renderer.commandLinkClass);
            }
            picker = $(picker);
            if (monthsToShow[1] > 1) {
                var count = 0;
                $(renderer.monthSelector, picker).each(function () {
                    var nth = ++count % monthsToShow[1];
                    $(this).addClass(nth == 1 ? 'first' : (nth == 0 ? 'last' : ''));
                });
            }
            // Add datepicker behaviour
            var self = this;
            picker.find(renderer.daySelector + ' a').hover(
				function () { $(this).addClass(renderer.highlightedClass); },
				function () {
				    (inst.inline ? $(this).parents('.' + self.markerClass) : inst.div).
						find(renderer.daySelector + ' a').
						removeClass(renderer.highlightedClass);
				}).
			click(function () {
			    self.selectDate(target, this);
			}).end().
			find('select.' + this._monthYearClass + ':not(.' + this._anyYearClass + ')').
			change(function () {
			    var monthYear = $(this).val().split('/');
			    self.showMonth(target, parseInt(monthYear[1], 10), parseInt(monthYear[0], 10));
			}).end().
			find('select.' + this._anyYearClass).
			click(function () {
			    $(this).css('visibility', 'hidden').
					next('input').css({ left: this.offsetLeft, top: this.offsetTop,
					    width: this.offsetWidth, height: this.offsetHeight
					}).show().focus();
			}).end().
			find('input.' + self._monthYearClass).
			change(function () {
			    try {
			        var year = parseInt($(this).val(), 10);
			        year = (isNaN(year) ? inst.drawDate.getFullYear() : year);
			        self.showMonth(target, year, inst.drawDate.getMonth() + 1, inst.drawDate.getDate());
			    }
			    catch (e) {
			        alert(e);
			    }
			}).keydown(function (event) {
			    if (event.keyCode == 13) { // Enter
			        $(event.target).change();
			    }
			    else if (event.keyCode == 27) { // Escape
			        $(event.target).hide().prev('select').css('visibility', 'visible');
			        inst.target.focus();
			    }
			});
            // Add command behaviour
            picker.find('.' + renderer.commandClass).click(function () {
                if (!$(this).hasClass(renderer.disabledClass)) {
                    var action = this.className.replace(
						new RegExp('^.*' + renderer.commandClass + '-([^ ]+).*$'), '$1');
                    $.datepick.performAction(target, action);
                }
            });
            // Add classes
            if (inst.get('isRTL')) {
                picker.addClass(renderer.rtlClass);
            }
            if (monthsToShow[0] * monthsToShow[1] > 1) {
                picker.addClass(renderer.multiClass);
            }
            var pickerClass = inst.get('pickerClass');
            if (pickerClass) {
                picker.addClass(pickerClass);
            }
            // Resize
            $('body').append(picker);
            var width = 0;
            picker.find(renderer.monthSelector).each(function () {
                width += $(this).outerWidth();
            });
            picker.width(width / monthsToShow[0]);
            // Pre-show customisation
            var onShow = inst.get('onShow');
            if (onShow) {
                onShow.apply(target, [picker, inst]);
            }
            return picker;
        },

        /* Generate the content for a single month.
        @param  target    (element) the control to affect
        @param  inst      (object) the current instance settings
        @param  year      (number) the year to generate
        @param  month     (number) the month to generate
        @param  renderer  (object) the rendering templates
        @param  first     (boolean) true if first of multiple months
        @return  (string) the month content */
        _generateMonth: function (target, inst, year, month, renderer, first) {
            var daysInMonth = $.datepick.daysInMonth(year, month);
            var monthsToShow = inst.get('monthsToShow');
            monthsToShow = ($.isArray(monthsToShow) ? monthsToShow : [1, monthsToShow]);
            var fixedWeeks = inst.get('fixedWeeks') || (monthsToShow[0] * monthsToShow[1] > 1);
            var firstDay = inst.get('firstDay');
            var leadDays = ($.datepick.newDate(year, month, 1).getDay() - firstDay + 7) % 7;
            var numWeeks = (fixedWeeks ? 6 : Math.ceil((leadDays + daysInMonth) / 7));
            var showOtherMonths = inst.get('showOtherMonths');
            var selectOtherMonths = inst.get('selectOtherMonths') && showOtherMonths;
            var dayStatus = inst.get('dayStatus');
            var minDate = (inst.pickingRange ? inst.selectedDates[0] : inst.get('minDate'));
            var maxDate = inst.get('maxDate');
            var rangeSelect = inst.get('rangeSelect');
            var onDate = inst.get('onDate');
            var showWeeks = renderer.week.indexOf('{weekOfYear}') > -1;
            var calculateWeek = inst.get('calculateWeek');
            var today = $.datepick.today();
            var drawDate = $.datepick.newDate(year, month, 1);
            $.datepick.add(drawDate, -leadDays - (fixedWeeks && (drawDate.getDay() == firstDay) ? 7 : 0), 'd');
            var ts = drawDate.getTime();
            // Generate weeks
            var weeks = '';
            for (var week = 0; week < numWeeks; week++) {
                var weekOfYear = (!showWeeks ? '' : '<span class="dp' + ts + '">' +
				(calculateWeek ? calculateWeek(drawDate) : 0) + '</span>');
                var days = '';
                for (var day = 0; day < 7; day++) {
                    var selected = false;
                    if (rangeSelect && inst.selectedDates.length > 0) {
                        selected = (drawDate.getTime() >= inst.selectedDates[0] &&
						drawDate.getTime() <= inst.selectedDates[1]);
                    }
                    else {
                        for (var i = 0; i < inst.selectedDates.length; i++) {
                            if (inst.selectedDates[i].getTime() == drawDate.getTime()) {
                                selected = true;
                                break;
                            }
                        }
                    }
                    var dateInfo = (!onDate ? {} :
					onDate.apply(target, [drawDate, drawDate.getMonth() + 1 == month]));
                    var selectable = (selectOtherMonths || drawDate.getMonth() + 1 == month) &&
					this._isSelectable(target, drawDate, dateInfo.selectable, minDate, maxDate);
                    days += this._prepare(renderer.day, inst).replace(/\{day\}/g,
					(selectable ? '<a href="javascript:void(0)"' : '<span') +
					' class="dp' + ts + ' ' + (dateInfo.dateClass || '') +
					(selected && (selectOtherMonths || drawDate.getMonth() + 1 == month) ?
					' ' + renderer.selectedClass : '') +
					(selectable ? ' ' + renderer.defaultClass : '') +
					((drawDate.getDay() || 7) < 6 ? '' : ' ' + renderer.weekendClass) +
					(drawDate.getMonth() + 1 == month ? '' : ' ' + renderer.otherMonthClass) +
					(drawDate.getTime() == today.getTime() && (drawDate.getMonth() + 1) == month ?
					' ' + renderer.todayClass : '') +
					(drawDate.getTime() == inst.drawDate.getTime() && (drawDate.getMonth() + 1) == month ?
					' ' + renderer.highlightedClass : '') + '"' +
					(dateInfo.title || (dayStatus && selectable) ? ' title="' +
					(dateInfo.title || $.datepick.formatDate(
					dayStatus, drawDate, inst.getConfig())) + '"' : '') + '>' +
					(showOtherMonths || (drawDate.getMonth() + 1) == month ?
					dateInfo.content || drawDate.getDate() : '&nbsp;') +
					(selectable ? '</a>' : '</span>'));
                    $.datepick.add(drawDate, 1, 'd');
                    ts = drawDate.getTime();
                }
                weeks += this._prepare(renderer.week, inst).replace(/\{days\}/g, days).
				replace(/\{weekOfYear\}/g, weekOfYear);
            }
            var monthHeader = this._prepare(renderer.month, inst).match(/\{monthHeader(:[^\}]+)?\}/);
            monthHeader = (monthHeader[0].length <= 13 ? 'MM yyyy' :
			monthHeader[0].substring(13, monthHeader[0].length - 1));
            monthHeader = (first ? this._generateMonthSelection(
			inst, year, month, minDate, maxDate, monthHeader, renderer) :
			$.datepick.formatDate(monthHeader, $.datepick.newDate(year, month, 1), inst.getConfig()));
            var weekHeader = this._prepare(renderer.weekHeader, inst).
			replace(/\{days\}/g, this._generateDayHeaders(inst, renderer));
            return this._prepare(renderer.month, inst).replace(/\{monthHeader(:[^\}]+)?\}/g, monthHeader).
			replace(/\{weekHeader\}/g, weekHeader).replace(/\{weeks\}/g, weeks);
        },

        /* Generate the HTML for the day headers.
        @param  inst      (object) the current instance settings
        @param  renderer  (object) the rendering templates
        @return  (string) a week's worth of day headers */
        _generateDayHeaders: function (inst, renderer) {
            var firstDay = inst.get('firstDay');
            var dayNames = inst.get('dayNames');
            var dayNamesMin = inst.get('dayNamesMin');
            var header = '';
            for (var day = 0; day < 7; day++) {
                var dow = (day + firstDay) % 7;
                header += this._prepare(renderer.dayHeader, inst).replace(/\{day\}/g,
				'<span class="' + this._curDoWClass + dow + '" title="' +
				dayNames[dow] + '">' + dayNamesMin[dow] + '</span>');
            }
            return header;
        },

        /* Generate selection controls for month.
        @param  inst         (object) the current instance settings
        @param  year         (number) the year to generate
        @param  month        (number) the month to generate
        @param  minDate      (CDate) the minimum date allowed
        @param  maxDate      (CDate) the maximum date allowed
        @param  monthHeader  (string) the month/year format
        @return  (string) the month selection content */
        _generateMonthSelection: function (inst, year, month, minDate, maxDate, monthHeader) {
            if (!inst.get('changeMonth')) {
                return $.datepick.formatDate(
				monthHeader, $.datepick.newDate(year, month, 1), inst.getConfig());
            }
            // Months
            var monthNames = inst.get('monthNames' + (monthHeader.match(/mm/i) ? '' : 'Short'));
            var html = monthHeader.replace(/m+/i, '\\x2E').replace(/y+/i, '\\x2F');
            var selector = '<select class="' + this._monthYearClass +
			'" title="' + inst.get('monthStatus') + '">';
            for (var m = 1; m <= 12; m++) {
                if ((!minDate || $.datepick.newDate(year, m, $.datepick.daysInMonth(year, m)).
					getTime() >= minDate.getTime()) &&
					(!maxDate || $.datepick.newDate(year, m, 1).getTime() <= maxDate.getTime())) {
                    selector += '<option value="' + m + '/' + year + '"' +
					(month == m ? ' selected="selected"' : '') + '>' +
					monthNames[m - 1] + '</option>';
                }
            }
            selector += '</select>';
            html = html.replace(/\\x2E/, selector);
            // Years
            var yearRange = inst.get('yearRange');
            if (yearRange == 'any') {
                selector = '<select class="' + this._monthYearClass + ' ' + this._anyYearClass +
				'" title="' + inst.get('yearStatus') + '">' +
				'<option>' + year + '</option></select>' +
				'<input class="' + this._monthYearClass + ' ' + this._curMonthClass +
				month + '" value="' + year + '">';
            }
            else {
                yearRange = yearRange.split(':');
                var todayYear = $.datepick.today().getFullYear();
                var start = (yearRange[0].match('c[+-].*') ? year + parseInt(yearRange[0].substring(1), 10) :
				((yearRange[0].match('[+-].*') ? todayYear : 0) + parseInt(yearRange[0], 10)));
                var end = (yearRange[1].match('c[+-].*') ? year + parseInt(yearRange[1].substring(1), 10) :
				((yearRange[1].match('[+-].*') ? todayYear : 0) + parseInt(yearRange[1], 10)));
                selector = '<select class="' + this._monthYearClass +
				'" title="' + inst.get('yearStatus') + '">';
                start = $.datepick.add($.datepick.newDate(start + 1, 1, 1), -1, 'd');
                end = $.datepick.newDate(end, 1, 1);
                var addYear = function (y) {
                    if (y != 0) {
                        selector += '<option value="' + month + '/' + y + '"' +
						(year == y ? ' selected="selected"' : '') + '>' + y + '</option>';
                    }
                };
                if (start.getTime() < end.getTime()) {
                    start = (minDate && minDate.getTime() > start.getTime() ? minDate : start).getFullYear();
                    end = (maxDate && maxDate.getTime() < end.getTime() ? maxDate : end).getFullYear();
                    for (var y = start; y <= end; y++) {
                        addYear(y);
                    }
                }
                else {
                    start = (maxDate && maxDate.getTime() < start.getTime() ? maxDate : start).getFullYear();
                    end = (minDate && minDate.getTime() > end.getTime() ? minDate : end).getFullYear();
                    for (var y = start; y >= end; y--) {
                        addYear(y);
                    }
                }
                selector += '</select>';
            }
            html = html.replace(/\\x2F/, selector);
            return html;
        },

        /* Prepare a render template for use.
        Exclude popup/inline sections that are not applicable.
        Localise text of the form: {l10n:name}.
        @param  text  (string) the text to localise
        @param  inst  (object) the current instance settings
        @return  (string) the localised text */
        _prepare: function (text, inst) {
            var replaceSection = function (type, retain) {
                while (true) {
                    var start = text.indexOf('{' + type + ':start}');
                    if (start == -1) {
                        return;
                    }
                    var end = text.substring(start).indexOf('{' + type + ':end}');
                    if (end > -1) {
                        text = text.substring(0, start) +
						(retain ? text.substr(start + type.length + 8, end - type.length - 8) : '') +
						text.substring(start + end + type.length + 6);
                    }
                }
            };
            replaceSection('inline', inst.inline);
            replaceSection('popup', !inst.inline);
            var pattern = /\{l10n:([^\}]+)\}/;
            var matches = null;
            while (matches = pattern.exec(text)) {
                text = text.replace(matches[0], inst.get(matches[1]));
            }
            return text;
        }
    });

    /* jQuery extend now ignores nulls!
    @param  target  (object) the object to extend
    @param  props   (object) the new settings
    @return  (object) the updated object */
    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;
    };

    /* Attach the datepicker functionality to a jQuery selection.
    @param  command  (string) the command to run (optional, default 'attach')
    @param  options  (object) the new settings to use for these instances (optional)
    @return  (jQuery) for chaining further calls */
    $.fn.datepick = function (options) {
        var otherArgs = Array.prototype.slice.call(arguments, 1);
        if ($.inArray(options, ['getDate', 'isDisabled', 'isSelectable', 'options', 'retrieveDate']) > -1) {
            return $.datepick[options].apply($.datepick, [this[0]].concat(otherArgs));
        }
        return this.each(function () {
            if (typeof options == 'string') {
                $.datepick[options].apply($.datepick, [this].concat(otherArgs));
            }
            else {
                $.datepick._attachPicker(this, options || {});
            }
        });
    };

    /* Initialise the datepicker functionality. */
    $.datepick = new Datepicker(); // singleton instance

    $(function () {
        $(document).mousedown($.datepick._checkExternalClick).
		resize(function () { $.datepick.hide($.datepick.curInst); });
    });

})(jQuery);