(function($) { // hide the namespace

function Datepicker() {
this.debug = false; // Change this to true to start debugging
        this._nextId = 0; // Next ID for a date picker instance
        this._inst = []; // List of instances indexed by ID
        this._curInst = null; // The current instance in use
        this._disabledInputs = []; // List of date picker inputs that have been disabled
        this._datepickerShowing = false; // True if the popup picker is showing , false if not
        this._inDialog = false; // True if showing within a "dialog", false if not
        this.regional = []; // Available regional settings, indexed by language code
        this.regional[''] = { // Default regional settings
                clearText: 'Очистить', // Display text for clear link
                clearStatus: 'Стереть текущую дату', // Status text for clear link
                closeText: 'Закрыть', // Display text for close link
                closeStatus: 'Закрыть без сохранения', // Status text for close link
                prevText: '<Пред', // Display text for previous month link
                prevStatus: 'Предыдущий месяц', // Status text for previous month link
                nextText: 'След>', // Display text for next month link
                nextStatus: 'Следующий месяц', // Status text for next month link
                currentText: 'Сегодня', // Display text for current month link
                currentStatus: 'Текущий месяц', // Status text for current month link
                monthNames: ['Январь','Февраль','Март','Апрель','Май','Июнь',
                        'Июль','Август','Сентябрь','Октябрь','Ноябрь','Декабрь'], // Names of months for drop-down and formatting
                monthNamesShort: ['Янв', 'Фев', 'Мар', 'Апр', 'Май', 'Июн', 'Июл', 'Авг', 'Сен', 'Окт', 'Ноя', 'Дек'], // For formatting
                monthStatus: 'Показать другой месяц', // Status text for selecting a month
                yearStatus: 'Показать другой год', // Status text for selecting a year
                weekHeader: 'Нед', // Header for the week of the year column
                weekStatus: 'Неделя года', // Status text for the week of the year column
                dayNames: ['Воскресенье', 'Понедельник', 'Вторник', 'Среда', 'Четверг', 'Пятница', 'Суббота'], // For formatting
                dayNamesShort: ['Вск', 'Пнд', 'Втр', 'Срд', 'Чтв', 'Птн', 'Сбт'], // For formatting
                dayNamesMin: ['Вс','Пн','Вт','Ср','Чт','Пт','Сб'], // Column headings for days starting at Sunday
                dayStatus: 'Установить первым днем недели', // Status text for the day of the week selection
                dateStatus: 'Выбрать день, месяц, год', // Status text for the date selection
                dateFormat: 'dd-mm-yy', // See format options on parseDate
                firstDay: 1, // The first day of the week, Sun = 0, Mon = 1, ...
                initStatus: 'Выбрать дату', // Initial Status text on opening
                isRTL: false // True if right-to-left language, false if left-to-right
        };
        this._defaults = { // Global defaults for all the date picker instances
                showOn: 'focus', // 'focus' for popup on focus,
                        // 'button' for trigger button, or 'both' for either
                showAnim: 'show', // Name of jQuery animation for popup
                defaultDate: null, // Used when field is blank: actual date,
                        // +/-number for offset from today, null for today
                appendText: '', // Display text following the input box, e.g. showing the format
                buttonText: '...', // Text for trigger button
                buttonImage: '', // URL for trigger button image
                buttonImageOnly: false, // True if the image appears alone, false if it appears on a button
                closeAtTop: true, // True to have the clear/close at the top,
                        // false to have them at the bottom
                mandatory: false, // True to hide the Clear link, false to include it
                hideIfNoPrevNext: false, // True to hide next/previous month links
                        // if not applicable, false to just disable them
                changeMonth: true, // True if month can be selected directly, false if only prev/next
                changeYear: true, // True if year can be selected directly, false if only prev/next
                yearRange: '-1:+1', // Range of years to display in drop-down,
                        // either relative to current year (-nn:+nn) or absolute (nnnn:nnnn)
                changeFirstDay: true, // True to click on day name to change, false to remain as set
                showOtherMonths: false, // True to show dates in other months, false to leave blank
                showWeeks: false, // True to show week of the year, false to omit
                calculateWeek: this.iso8601Week, // How to calculate the week of the year,
                        // takes a Date and returns the number of the week for it
                shortYearCutoff: '+10', // Short year values < this are in the current century,
                        // > this are in the previous century, 
                        // string value starting with '+' for current year + value
                showStatus: false, // True to show status bar at bottom, false to not show it
                statusForDate: this.dateStatus, // Function to provide status text for a date -
                        // takes date and instance as parameters, returns display text
                minDate: null, // The earliest selectable date, or null for no limit
                maxDate: null, // The latest selectable date, or null for no limit
                speed: 'medium', // Speed of display/closure
                beforeShowDay: null, // Function that takes a date and returns an array with
                        // [0] = true if selectable, false if not,
                        // [1] = custom CSS class name(s) or '', e.g. $.datepicker.noWeekends
                beforeShow: null, // Function that takes an input field and
                        // returns a set of custom settings for the date picker
                onSelect: null, // Define a callback function when a date is selected
                numberOfMonths: 1, // Number of months to show at a time
                stepMonths: 1, // Number of months to step back/forward
                rangeSelect: false, // Allows for selecting a date range on one date picker
                rangeSeparator: ' - ' // Text between two dates in a range
        };
        $.extend(this._defaults, this.regional['']);
        this._datepickerDiv = $('<div id="datepicker_div"></div>');
}

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

        /* Debug logging (if enabled). */
        log: function () {
                if (this.debug) {
                        console.log.apply('', arguments);
                }
        },
        
        /* Register a new date picker instance - with custom settings. */
        _register: function(inst) {
                var id = this._nextId++;
                this._inst[id] = inst;
                return id;
        },

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

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

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

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

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

        /* Attach an inline date picker to a div. */
        _inlineDatepicker: function(target, inst) {
                var input = $(target);
                if (this._hasClass(input, this.markerClassName)) {
                        return;
                }
                input.addClass(this.markerClassName).append(inst._datepickerDiv);
                input[0]._calId = inst._id;
                this._updateDatepicker(inst);
                /* @todo: fix _inlineShow automatic resizing
                        - Endless loop bug in IE6.  
                        - inst._datepickerDiv.resize doesn't ever fire in firefox.  */
                // inst._datepickerDiv.resize(function() { $.datepicker._inlineShow(inst); });
        },

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

        /* Does this element have a particular class? */
        _hasClass: function(element, className) {
                var classes = element.attr('class');
                return (classes && classes.indexOf(className) > -1);
        },

        /* Pop-up the date picker in a "dialog" box.
           @param  dateText  string - the initial date to display (in the current format)
           @param  onSelect  function - the function(dateText) to call when a date is selected
           @param  settings  object - update the dialog date picker instance's settings (anonymous object)
           @param  pos       int[2] - coordinates for the dialog's position within the screen or
                             event - with x/y coordinates or
                             leave empty for default (screen centre)
           @return the manager object */
        dialogDatepicker: function(dateText, onSelect, settings, pos) {
                var inst = this._dialogInst; // internal instance
                if (!inst) {
                        inst = this._dialogInst = new DatepickerInstance({}, false);
                        this._dialogInput = $('<input type="text" size="1" style="position: absolute; top: -100px;"/>');
                        this._dialogInput.keydown(this._doKeyDown);
                        $('body').append(this._dialogInput);
                        this._dialogInput[0]._calId = inst._id;
                }
                extendRemove(inst._settings, settings || {});
                this._dialogInput.val(dateText);

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

                // move input on screen for focus, but hidden behind dialog
                this._dialogInput.css('left', this._pos[0] + 'px').css('top', this._pos[1] + 'px');
                inst._settings.onSelect = onSelect;
                this._inDialog = true;
                this._datepickerDiv.addClass('datepicker_dialog');
                this.showFor(this._dialogInput[0]);
                if ($.blockUI) {
                        $.blockUI(this._datepickerDiv);
                }
                return this;
        },

        /* Pop-up the date picker for a given input field.
           @param  control  element - the input field attached to the date picker or
                            string - the ID or other jQuery selector of the input field or
                            object - jQuery object for input field
           @return the manager object */
        showFor: function(control) {
                control = (control.jquery ? control[0] :
                        (typeof control == 'string' ? $(control)[0] : control));
                var input = (control.nodeName && control.nodeName.toLowerCase() == 'input' ? control : this);
                if (input.nodeName.toLowerCase() != 'input') { // find from button/image trigger
                        input = $('input', input.parentNode)[0];
                }
                if ($.datepicker._lastInput == input) { // already here
                        return;
                }
                if ($(input).isDisabledDatepicker()) {
                        return;
                }
                var inst = $.datepicker._getInst(input._calId);
                var beforeShow = inst._get('beforeShow');
                extendRemove(inst._settings, (beforeShow ? beforeShow.apply(input, [input, inst]) : {}));
                $.datepicker.hideDatepicker('');
                $.datepicker._lastInput = input;
                inst._setDateFromField(input);
                if ($.datepicker._inDialog) { // hide cursor
                        input.value = '';
                }
                if (!$.datepicker._pos) { // position below input
                        $.datepicker._pos = $.datepicker._findPos(input);
                        $.datepicker._pos[1] += input.offsetHeight; // add the height
                }
                var isFixed = false;
                $(input).parents().each(function() {
                        isFixed |= $(this).css('position') == 'fixed';
                });
                if (isFixed && $.browser.opera) { // correction for Opera when fixed and scrolled
                        $.datepicker._pos[0] -= document.documentElement.scrollLeft;
                        $.datepicker._pos[1] -= document.documentElement.scrollTop;
                }
                inst._datepickerDiv.css('position', ($.datepicker._inDialog && $.blockUI ?
                        'static' : (isFixed ? 'fixed' : 'absolute'))).
                        css('left', $.datepicker._pos[0] + 'px').css('top', $.datepicker._pos[1] + 'px');
                $.datepicker._pos = null;
                $.datepicker._showDatepicker(inst);
                return this;
        },

        /* Construct and display the date picker. */
        _showDatepicker: function(id) {
                var inst = this._getInst(id);
                inst._rangeStart = null;
                this._updateDatepicker(inst);
                if (!inst._inline) {
                        var speed = inst._get('speed');
                        var postProcess = function() {
                                $.datepicker._datepickerShowing = true;
                                $.datepicker._afterShow(inst);
                        };
                        var showAnim = inst._get('showAnim') || 'show';
                        inst._datepickerDiv[showAnim](speed, postProcess);
                        if (speed == '') {
                                postProcess();
                        }
                        if (inst._input[0].type != 'hidden') {
                                inst._input[0].focus();
                        }
                        this._curInst = inst;
                }
        },

        /* Generate the date picker content. */
        _updateDatepicker: function(inst) {
                inst._datepickerDiv.empty().append(inst._generateDatepicker());
                var numMonths = inst._getNumberOfMonths();
                if (numMonths[0] != 1 || numMonths[1] != 1) {
                        inst._datepickerDiv.addClass('datepicker_multi');
                } 
                else {
                        inst._datepickerDiv.removeClass('datepicker_multi');
                }
                if (inst._get('isRTL')) {
                        inst._datepickerDiv.addClass('datepicker_rtl');
                }
                else {
                        inst._datepickerDiv.removeClass('datepicker_rtl');
                }
                if (inst._input && inst._input[0].type != 'hidden') {
                        inst._input[0].focus();
                }
        },

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

        /* Hide the date picker from view.
           @param  speed  string - the speed at which to close the date picker
           @return void */
        hideDatepicker: function(speed) {
                var inst = this._curInst;
                if (!inst) {
                        return;
                }
                var rangeSelect = inst._get('rangeSelect');
                if (rangeSelect && this._stayOpen) {
                        this._selectDate(inst, inst._formatDate(
                                inst._currentDay, inst._currentMonth, inst._currentYear));
                }
                this._stayOpen = false;
                if (this._datepickerShowing) {
                        speed = (speed != null ? speed : inst._get('speed'));
                        inst._datepickerDiv.hide(speed, function() {
                                $.datepicker._tidyDialog(inst);
                        });
                        if (speed == '') {
                                this._tidyDialog(inst);
                        }
                        this._datepickerShowing = false;
                        this._lastInput = null;
                        inst._settings.prompt = null;
                        if (this._inDialog) {
                                this._dialogInput.css('position', 'absolute').
                                        css('left', '0px').css('top', '-100px');
                                if ($.blockUI) {
                                        $.unblockUI();
                                        $('body').append(this._datepickerDiv);
                                }
                        }
                        this._inDialog = false;
                }
                this._curInst = null;
        },

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

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

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

        /* Action for current link. */
        _gotoToday: function(id) {
                var date = new Date();
                var inst = this._getInst(id);
                inst._selectedDay = date.getDate();
                inst._selectedMonth = date.getMonth();
                inst._selectedYear = date.getFullYear();
                this._adjustDate(inst);
        },

        /* Action for selecting a new month/year. */
        _selectMonthYear: function(id, select, period) {
                var inst = this._getInst(id);
                inst._selectingMonthYear = false;
                inst[period == 'M' ? '_selectedMonth' : '_selectedYear'] =
                        select.options[select.selectedIndex].value - 0;
                this._adjustDate(inst);
        },

        /* Restore input focus after not changing month/year. */
        _clickMonthYear: function(id) {
                var inst = this._getInst(id);
                if (inst._input && inst._selectingMonthYear && !$.browser.msie) {
                        inst._input[0].focus();
                }
                inst._selectingMonthYear = !inst._selectingMonthYear;
        },

        /* Action for changing the first week day. */
        _changeFirstDay: function(id, day) {
                var inst = this._getInst(id);
                inst._settings.firstDay = day;
                this._updateDatepicker(inst);
        },

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

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

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

        /* Set as beforeShowDay function to prevent selection of weekends.
           @param  date  Date - the date to customise
           @return [boolean, string] - is this date selectable?, what is its CSS class? */
        noWeekends: function(date) {
                var day = date.getDay();
                return [(day > 0 && day < 6), ''];
        },
        
        /* Set as calculateWeek to determine the week of the year based on the ISO 8601 definition.
           @param  date  Date - the date to get the week for
           @return  number - the number of the week within the year that contains this date */
        iso8601Week: function(date) {
                var checkDate = new Date(date.getFullYear(), date.getMonth(), date.getDate());
                var firstMon = new Date(checkDate.getFullYear(), 1 - 1, 4); // First week always contains 4 Jan
                var firstDay = firstMon.getDay() || 7; // Day of week: Mon = 1, ..., Sun = 7
                firstMon.setDate(firstMon.getDate() + 1 - firstDay); // Preceding Monday
                if (firstDay < 4 && checkDate < firstMon) { // Adjust first three days in year if necessary
                        checkDate.setDate(checkDate.getDate() - 3); // Generate for previous year
                        return $.datepicker.iso8601Week(checkDate);
                }
                else if (checkDate > new Date(checkDate.getFullYear(), 12 - 1, 28)) { // Check last three days in year
                        firstDay = new Date(checkDate.getFullYear() + 1, 1 - 1, 4).getDay() || 7;
                        if (firstDay > 4 && (checkDate.getDay() || 7) < firstDay - 3) { // Adjust if necessary
                                checkDate.setDate(checkDate.getDate() + 3); // Generate for next year
                                return $.datepicker.iso8601Week(checkDate);
                        }
                }
                return Math.floor(((checkDate - firstMon) / 86400000) / 7) + 1; // Weeks to given date
        },
        
        /* Provide status text for a particular date.
           @param  date  the date to get the status for
           @param  inst  the current datepicker instance
           @return  the status display text for this date */
        dateStatus: function(date, inst) {
                return $.datepicker.formatDate(inst._get('dateStatus'), date, inst._get('dayNamesShort'),
                        inst._get('dayNames'), inst._get('monthNamesShort'), inst._get('monthNames'));
        },

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

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

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

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

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

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

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

        /* Parse existing date and initialise date picker. */
        _setDateFromField: function(input) {
                this._input = $(input);
                var dateFormat = this._get('dateFormat');
                var dates = this._input ? this._input.val().split(this._get('rangeSeparator')) : null; 
                this._endDay = this._endMonth = this._endYear = null;
                var shortYearCutoff = this._get('shortYearCutoff');
                shortYearCutoff = (typeof shortYearCutoff != 'string' ? shortYearCutoff :
                        new Date().getFullYear() % 100 + parseInt(shortYearCutoff, 10));
                var date = defaultDate = this._getDefaultDate();
                if (dates.length > 0) {
                        var dayNamesShort = this._get('dayNamesShort');
                        var dayNames = this._get('dayNames');
                        var monthNamesShort = this._get('monthNamesShort');
                        var monthNames = this._get('monthNames');
                        if (dates.length > 1) {
                                date = $.datepicker.parseDate(dateFormat, dates[1], shortYearCutoff,
                                        dayNamesShort, dayNames, monthNamesShort, monthNames) || defaultDate;
                                this._endDay = date.getDate();
                                this._endMonth = date.getMonth();
                                this._endYear = date.getFullYear();
                        }
                        try {
                                date = $.datepicker.parseDate(dateFormat, dates[0], shortYearCutoff,
                                        dayNamesShort, dayNames, monthNamesShort, monthNames) ||defaultDate;
                        }
                        catch (e) {
                                $.datepicker.log(e);
                                date = defaultDate;
                        }
                }
                this._selectedDay = this._currentDay = date.getDate();
                this._selectedMonth = this._currentMonth = date.getMonth();
                this._selectedYear = this._currentYear = date.getFullYear();
                this._adjustDate();
        },
        
        /* Retrieve the default date shown on opening. */
        _getDefaultDate: function() {
                return this._determineDate('defaultDate', new Date());
        },

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

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

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

        /* Generate the HTML for the current state of the date picker. */
        _generateDatepicker: function() {
                var today = new Date();
                today = new Date(today.getFullYear(), today.getMonth(), today.getDate()); // clear time
                var showStatus = this._get('showStatus');
                var isRTL = this._get('isRTL');
                // build the date picker HTML
                var clear = (this._get('mandatory') ? '' :
                        '<div class="datepicker_clear"><a onclick="jQuery.datepicker._clearDate(' + this._id + ');"' + 
                        (showStatus ? this._addStatus(this._get('clearStatus') || '&#xa0;') : '') + '>' +
                        this._get('clearText') + '</a></div>');
                var controls = '<div class="datepicker_control">' + (isRTL ? '' : clear) +
                        '<div class="datepicker_close"><a onclick="jQuery.datepicker.hideDatepicker();"' +
                        (showStatus ? this._addStatus(this._get('closeStatus') || '&#xa0;') : '') + '>' +
                        this._get('closeText') + '</a></div>' + (isRTL ? clear : '')  + '</div>';
                var prompt = this._get('prompt');
                var closeAtTop = this._get('closeAtTop');
                var hideIfNoPrevNext = this._get('hideIfNoPrevNext');
                var numMonths = this._getNumberOfMonths();
                var stepMonths = this._get('stepMonths');
                var isMultiMonth = (numMonths[0] != 1 || numMonths[1] != 1);
                var minDate = this._getMinMaxDate('min', true);
                var maxDate = this._getMinMaxDate('max');
                var drawMonth = this._selectedMonth;
                var drawYear = this._selectedYear;
                if (maxDate) {
                        var maxDraw = new Date(maxDate.getFullYear(),
                                maxDate.getMonth() - numMonths[1] + 1, maxDate.getDate());
                        maxDraw = (minDate && maxDraw < minDate ? minDate : maxDraw);
                        while (new Date(drawYear, drawMonth, 1) > maxDraw) {
                                drawMonth--;
                                if (drawMonth < 0) {
                                        drawMonth = 11;
                                        drawYear--;
                                }
                        }
                }
                // controls and links
                var prev = '<div class="datepicker_prev">' + (this._canAdjustMonth(-1, drawYear, drawMonth) ? 
                        '<a onclick="jQuery.datepicker._adjustDate(' + this._id + ', -' + stepMonths + ', \'M\');"' +
                        (showStatus ? this._addStatus(this._get('prevStatus') || '&#xa0;') : '') + '>' +
                        this._get('prevText') + '</a>' :
                        (hideIfNoPrevNext ? '' : '<label>' + this._get('prevText') + '</label>')) + '</div>';
                var next = '<div class="datepicker_next">' + (this._canAdjustMonth(+1, drawYear, drawMonth) ?
                        '<a onclick="jQuery.datepicker._adjustDate(' + this._id + ', +' + stepMonths + ', \'M\');"' +
                        (showStatus ? this._addStatus(this._get('nextStatus') || '&#xa0;') : '') + '>' +
                        this._get('nextText') + '</a>' :
                        (hideIfNoPrevNext ? '>' : '<label>' + this._get('nextText') + '</label>')) + '</div>';
                var html = (prompt ? '<div class="datepicker_prompt">' + prompt + '</div>' : '') +
                        (closeAtTop && !this._inline ? controls : '') +
                        '<div class="datepicker_links">' + (isRTL ? next : prev) +
                        (this._isInRange(today) ? '<div class="datepicker_current">' +
                        '<a onclick="jQuery.datepicker._gotoToday(' + this._id + ');"' +
                        (showStatus ? this._addStatus(this._get('currentStatus') || '&#xa0;') : '') + '>' +
                        this._get('currentText') + '</a></div>' : '') + (isRTL ? prev : next) + '</div>';
                var showWeeks = this._get('showWeeks');
                for (var row = 0; row < numMonths[0]; row++) {
                for (var col = 0; col < numMonths[1]; col++) {
                        var selectedDate = new Date(drawYear, drawMonth, this._selectedDay);
                        html += '<div class="datepicker_oneMonth' + (col == 0 ? ' datepicker_newRow' : '') + '">' +
                                this._generateMonthYearHeader(drawMonth, drawYear, minDate, maxDate,
                                selectedDate, row > 0 || col > 0) + // draw month headers
                                '<table class="datepicker" cellpadding="0" cellspacing="0"><thead>' + 
                                '<tr class="datepicker_titleRow">' +
                                (showWeeks ? '<td>' + this._get('weekHeader') + '</td>' : '');
                        var firstDay = this._get('firstDay');
                        var changeFirstDay = this._get('changeFirstDay');
                        var dayNames = this._get('dayNames');
                        var dayNamesShort = this._get('dayNamesShort');
                        var dayNamesMin = this._get('dayNamesMin');
                        for (var dow = 0; dow < 7; dow++) { // days of the week
                                var day = (dow + firstDay) % 7;
                                var status = this._get('dayStatus') || '&#xa0;';
                                status = (status.indexOf('DD') > -1 ? status.replace(/DD/, dayNames[day]) :
                                        status.replace(/D/, dayNamesShort[day]));
                                html += '<td' + ((dow + firstDay + 6) % 7 >= 5 ? ' class="datepicker_weekEndCell"' : '') + '>' +
                                        (!changeFirstDay ? '<span' :
                                        '<a onclick="jQuery.datepicker._changeFirstDay(' + this._id + ', ' + day + ');"') + 
                                        (showStatus ? this._addStatus(status) : '') + ' title="' + dayNames[day] + '">' +
                                        dayNamesMin[day] + (changeFirstDay ? '</a>' : '</span>') + '</td>';
                        }
                        html += '</tr></thead><tbody>';
                        var daysInMonth = this._getDaysInMonth(drawYear, drawMonth);
                        if (drawYear == this._selectedYear && drawMonth == this._selectedMonth) {
                                this._selectedDay = Math.min(this._selectedDay, daysInMonth);
                        }
                        var leadDays = (this._getFirstDayOfMonth(drawYear, drawMonth) - firstDay + 7) % 7;
                        var currentDate = new Date(this._currentYear, this._currentMonth, this._currentDay);
                        var endDate = this._endDay ? new Date(this._endYear, this._endMonth, this._endDay) : currentDate;
                        var printDate = new Date(drawYear, drawMonth, 1 - leadDays);
                        var numRows = (isMultiMonth ? 6 : Math.ceil((leadDays + daysInMonth) / 7)); // calculate the number of rows to generate
                        var beforeShowDay = this._get('beforeShowDay');
                        var showOtherMonths = this._get('showOtherMonths');
                        var calculateWeek = this._get('calculateWeek') || $.datepicker.iso8601Week;
                        var dateStatus = this._get('statusForDate') || $.datepicker.dateStatus;
                        for (var dRow = 0; dRow < numRows; dRow++) { // create date picker rows
                                html += '<tr class="datepicker_daysRow">' +
                                        (showWeeks ? '<td class="datepicker_weekCol">' + calculateWeek(printDate) + '</td>' : '');
                                for (var dow = 0; dow < 7; dow++) { // create date picker days
                                        var daySettings = (beforeShowDay ?
                                                beforeShowDay.apply((this._input ? this._input[0] : null), [printDate]) : [true, '']);
                                        var otherMonth = (printDate.getMonth() != drawMonth);
                                        var unselectable = otherMonth || !daySettings[0] ||
                                                (minDate && printDate < minDate) || (maxDate && printDate > maxDate);
                                        html += '<td class="datepicker_daysCell' +
                                                ((dow + firstDay + 6) % 7 >= 5 ? ' datepicker_weekEndCell' : '') + // highlight weekends
                                                (otherMonth ? ' datepicker_otherMonth' : '') + // highlight days from other months
                                                (printDate.getTime() == selectedDate.getTime() && drawMonth == this._selectedMonth ?
                                                ' datepicker_daysCellOver' : '') + // highlight selected day
                                                (unselectable ? ' datepicker_unselectable' : '') +  // highlight unselectable days
                                                (otherMonth && !showOtherMonths ? '' : ' ' + daySettings[1] + // highlight custom dates
                                                (printDate.getTime() >= currentDate.getTime() && printDate.getTime() <= endDate.getTime() ?  // in current range
                                                ' datepicker_currentDay' : // highlight selected day
                                                (printDate.getTime() == today.getTime() ? ' datepicker_today' : ''))) + '"' + // highlight today (if different)
                                                (unselectable ? '' : ' onmouseover="jQuery(this).addClass(\'datepicker_daysCellOver\');' +
                                                (!showStatus || (otherMonth && !showOtherMonths) ? '' : 'jQuery(\'#datepicker_status_' +
                                                this._id + '\').html(\'' + (dateStatus.apply((this._input ? this._input[0] : null),
                                                [printDate, this]) || '&#xa0;') +'\');') + '"' +
                                                ' onmouseout="jQuery(this).removeClass(\'datepicker_daysCellOver\');' +
                                                (!showStatus || (otherMonth && !showOtherMonths) ? '' : 'jQuery(\'#datepicker_status_' +
                                                this._id + '\').html(\'&#xa0;\');') + '" onclick="jQuery.datepicker._selectDay(' +
                                                this._id + ',' + drawMonth + ',' + drawYear + ', this);"') + '>' + // actions
                                                (otherMonth ? (showOtherMonths ? printDate.getDate() : '&#xa0;') : // display for other months
                                                (unselectable ? printDate.getDate() : '<a>' + printDate.getDate() + '</a>')) + '</td>'; // display for this month
                                        printDate.setDate(printDate.getDate() + 1);
                                }
                                html += '</tr>';
                        }
                        drawMonth++;
                        if (drawMonth > 11) {
                                drawMonth = 0;
                                drawYear++;
                        }
                        html += '</tbody></table></div>';
                }
                }
                html += (showStatus ? '<div id="datepicker_status_' + this._id + 
                        '" class="datepicker_status">' + (this._get('initStatus') || '&#xa0;') + '</div>' : '') +
                        (!closeAtTop && !this._inline ? controls : '') +
                        '<div style="clear: both;"></div>' + 
                        ($.browser.msie && parseInt($.browser.version) < 7 && !this._inline ? 
                        '<iframe src="javascript:false;" class="datepicker_cover"></iframe>' : '');
                return html;
        },
        
        /* Generate the month and year header. */
        _generateMonthYearHeader: function(drawMonth, drawYear, minDate, maxDate, selectedDate, secondary) {
                minDate = (this._rangeStart && minDate && selectedDate < minDate ? selectedDate : minDate);
                var showStatus = this._get('showStatus');
                var html = '<div class="datepicker_header">';
                // month selection
                var monthNames = this._get('monthNames');
                if (secondary || !this._get('changeMonth')) {
                        html += monthNames[drawMonth] + '&#xa0;';
                }
                else {
                        var inMinYear = (minDate && minDate.getFullYear() == drawYear);
                        var inMaxYear = (maxDate && maxDate.getFullYear() == drawYear);
                        html += '<select class="datepicker_newMonth" ' +
                                'onchange="jQuery.datepicker._selectMonthYear(' + this._id + ', this, \'M\');" ' +
                                'onclick="jQuery.datepicker._clickMonthYear(' + this._id + ');"' +
                                (showStatus ? this._addStatus(this._get('monthStatus') || '&#xa0;') : '') + '>';
                        for (var month = 0; month < 12; month++) {
                                if ((!inMinYear || month >= minDate.getMonth()) &&
                                                (!inMaxYear || month <= maxDate.getMonth())) {
                                        html += '<option value="' + month + '"' +
                                                (month == drawMonth ? ' selected="selected"' : '') +
                                                '>' + monthNames[month] + '</option>';
                                }
                        }
                        html += '</select>';
                }
                // year selection
                if (secondary || !this._get('changeYear')) {
                        html += drawYear;
                }
                else {
                        // determine range of years to display
                        var years = this._get('yearRange').split(':');
                        var year = 0;
                        var endYear = 0;
                        if (years.length != 2) {
                                year = drawYear - 10;
                                endYear = drawYear + 10;
                        }
                        else if (years[0].charAt(0) == '+' || years[0].charAt(0) == '-') {
                                year = drawYear + parseInt(years[0], 10);
                                endYear = drawYear + parseInt(years[1], 10);
                        }
                        else {
                                year = parseInt(years[0], 10);
                                endYear = parseInt(years[1], 10);
                        }
                        year = (minDate ? Math.max(year, minDate.getFullYear()) : year);
                        endYear = (maxDate ? Math.min(endYear, maxDate.getFullYear()) : endYear);
                        html += '<select class="datepicker_newYear" ' +
                                'onchange="jQuery.datepicker._selectMonthYear(' + this._id + ', this, \'Y\');" ' +
                                'onclick="jQuery.datepicker._clickMonthYear(' + this._id + ');"' +
                                (showStatus ? this._addStatus(this._get('yearStatus') || '&#xa0;') : '') + '>';
                        for (; year <= endYear; year++) {
                                html += '<option value="' + year + '"' +
                                        (year == drawYear ? ' selected="selected"' : '') +
                                        '>' + year + '</option>';
                        }
                        html += '</select>';
                }
                html += '</div>'; // Close datepicker_header
                return html;
        },

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

        /* Adjust one of the date sub-fields. */
        _adjustDate: function(offset, period) {
                var year = this._selectedYear + (period == 'Y' ? offset : 0);
                var month = this._selectedMonth + (period == 'M' ? offset : 0);
                var day = Math.min(this._selectedDay, this._getDaysInMonth(year, month)) +
                        (period == 'D' ? offset : 0);
                var date = new Date(year, month, day);
                // ensure it is within the bounds set
                var minDate = this._getMinMaxDate('min', true);
                var maxDate = this._getMinMaxDate('max');
                date = (minDate && date < minDate ? minDate : date);
                date = (maxDate && date > maxDate ? maxDate : date);
                this._selectedDay = date.getDate();
                this._selectedMonth = date.getMonth();
                this._selectedYear = date.getFullYear();
        },
        
        /* Determine the number of months to show. */
        _getNumberOfMonths: function() {
                var numMonths = this._get('numberOfMonths');
                return (numMonths == null ? [1, 1] : (typeof numMonths == 'number' ? [1, numMonths] : numMonths));
        },

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

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

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

        /* Determines if we should allow a "next/prev" month display change. */
        _canAdjustMonth: function(offset, curYear, curMonth) {
                var numMonths = this._getNumberOfMonths();
                var date = new Date(curYear, curMonth + (offset < 0 ? offset : numMonths[1]), 1);
                if (offset < 0) {
                        date.setDate(this._getDaysInMonth(date.getFullYear(), date.getMonth()));
                }
                return this._isInRange(date);
        },

        /* Is the given date in the accepted range? */
        _isInRange: function(date) {
                // during range selection, use minimum of selected date and range start
                var newMinDate = (!this._rangeStart ? null :
                        new Date(this._selectedYear, this._selectedMonth, this._selectedDay));
                newMinDate = (newMinDate && this._rangeStart < newMinDate ? this._rangeStart : newMinDate);
                var minDate = newMinDate || this._getMinMaxDate('min');
                var maxDate = this._getMinMaxDate('max');
                return ((!minDate || date >= minDate) && (!maxDate || date <= maxDate));
        },

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

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

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

/* Detach a datepicker from its control.
   @return jQuery object - for chaining further calls */
$.fn.removeDatepicker = function() {
        var jq = this.each(function() {
                var $this = $(this);
                var nodeName = this.nodeName.toLowerCase();
                var calId = this._calId;
                this._calId = null;
                if (nodeName == 'input') {
                        $this.siblings('.datepicker_append').replaceWith('');
                        $this.siblings('.datepicker_trigger').replaceWith('');
                        $this.removeClass($.datepicker.markerClassName).
                                unbind('focus', $.datepicker.showFor).
                                unbind('keydown', $.datepicker._doKeyDown).
                                unbind('keypress', $.datepicker._doKeyPress);
                        var wrapper = $this.parents('.datepicker_wrap');
                        if (wrapper) {
                                wrapper.replaceWith(wrapper.html());
                        }
                } 
                else if (nodeName == 'div' || nodeName == 'span') {
                        $this.removeClass($.datepicker.markerClassName).empty();
                }
                if ($('input[_calId=' + calId + ']').length == 0) {
                        // clean up if last for this ID
                        $.datepicker._inst[calId] = null;
                }
        });
        if ($('input.hasDatepicker').length == 0) {
                // clean up if last input 
                $.datepicker._datepickerDiv.replaceWith('');
        }
        return jq;
};

/* Enable the date picker to a jQuery selection.
   @return jQuery object - for chaining further calls */
$.fn.enableDatepicker = function() {
        return this.each(function() {
                this.disabled = false;
                $(this).siblings('button.datepicker_trigger').each(function() { this.disabled = false; });
                $(this).siblings('img.datepicker_trigger').css({opacity: '1.0', cursor: ''});
                var $this = this;
                $.datepicker._disabledInputs = $.map($.datepicker._disabledInputs,
                        function(value) { return (value == $this ? null : value); }); // delete entry
        });
};

/* Disable the date picker to a jQuery selection.
   @return jQuery object - for chaining further calls */
$.fn.disableDatepicker = function() {
        return this.each(function() {
                this.disabled = true;
                $(this).siblings('button.datepicker_trigger').each(function() { this.disabled = true; });
                $(this).siblings('img.datepicker_trigger').css({opacity: '0.5', cursor: 'default'});
                var $this = this;
                $.datepicker._disabledInputs = $.map($.datepicker._disabledInputs,
                        function(value) { return (value == $this ? null : value); }); // delete entry
                $.datepicker._disabledInputs[$.datepicker._disabledInputs.length] = this;
        });
};

/* Is the first field in a jQuery collection disabled as a datepicker?
   @return boolean - true if disabled, false if enabled */
$.fn.isDisabledDatepicker = function() {
        if (this.length == 0) {
                return false;
        }
        for (var i = 0; i < $.datepicker._disabledInputs.length; i++) {
                if ($.datepicker._disabledInputs[i] == this[0]) {
                        return true;
                }
        }
        return false;
};

/* Update the settings for a date picker attached to an input field or division.
   @param  name   string - the name of the setting to change
                  object - the new settings to update
   @param  value  any - the new value for the setting (omit if above is a map)
   @return jQuery object - for chaining further calls */
$.fn.changeDatepicker = function(name, value) {
        var settings = name || {};
        if (typeof name == 'string') {
                settings = {};
                settings[name] = value;
        }
        return this.each(function() {
                var inst = $.datepicker._getInst(this._calId);
                if (inst) {
                        extendRemove(inst._settings, settings);
                        $.datepicker._updateDatepicker(inst);
                }
        });
};

/* Show the date picker attached to the first entry in a jQuery selection.
   @return jQuery object - for chaining further calls */
$.fn.showDatepicker = function() {
        $.datepicker.showFor(this);
        return this;
};

/* Set the dates for a jQuery selection.
   @param  date     Date - the new date
   @param  endDate  Date - the new end date for a range (optional)
   @return jQuery object - for chaining further calls */
$.fn.setDatepickerDate = function(date, endDate) {
        return this.each(function() {
                var inst = $.datepicker._getInst(this._calId);
                if (inst) {
                        inst._setDate(date, endDate);
                        $.datepicker._updateDatepicker(inst);
                }
        });
};

/* Get the date(s) for the first entry in a jQuery selection.
   @return Date - the current date or
           Date[2] - the current dates for a range*/
$.fn.getDatepickerDate = function() {
        var inst = (this.length > 0 ? $.datepicker._getInst(this[0]._calId) : null);
        return (inst ? inst._getDate() : null);
};
        
/* Initialise the date picker. */
$(document).ready(function() {
        $.datepicker = new Datepicker(); // singleton instance
        $(document.body).append($.datepicker._datepickerDiv).
                mousedown($.datepicker._checkExternalClick);
});

})(jQuery);