/* jQuery Calendar v2.8
Written by Marc Grabanski (m@marcgrabanski.com) and Keith Wood (kbwood@iprimus.com.au).

Copyright (c) 2007 Marc Grabanski (http://marcgrabanski.com/code/jquery-calendar)
Dual licensed under the GPL (http://www.gnu.org/licenses/gpl-3.0.txt) and 
CC (http://creativecommons.org/licenses/by/3.0/) licenses. "Share or Remix it but please Attribute the authors."
Date: 09-03-2007  */

/* PopUp Calendar manager.
Use the singleton instance of this class, popUpCal, to interact with the calendar.
Settings for (groups of) calendars are maintained in an instance object
(PopUpCalInstance), allowing multiple different settings on the same page. */

(function($) { // hide the namespace

function PopUpCal() {
this.debug = false; // Change this to true to start debugging
this._nextId = 0; // Next ID for a calendar instance
this._inst = []; // List of instances indexed by ID
this._curInst = null; // The current instance in use
this._disabledInputs = []; // List of calendar inputs that have been disabled
this._popUpShowing = false; // True if the popup calendar is showing , false if not
this._inDialog = false; // True if showing within a "dialog", false if not
this.regional = []; // Available regional settings, indexed by language code
this.regional[''] = { // Default regional settings
clearText: 'Clear', // Display text for clear link
closeText: 'Close', // Display text for close link
prevText: '&lt;Prev', // Display text for previous month link
nextText: 'Next&gt;', // Display text for next month link
currentText: 'Current', // Display text for current month link
dayNames: ['Su','Mo','Tu','We','Th','Fr','Sa'], // Names of days starting at Sunday
monthNames: ['January','February','March','April','May','June','July','August','September','October','November','December'], // Names of months

dateFormat: 'MDY/', // First three are day, month, year in the required order,
// fourth (optional) is the separator, e.g. US would be 'MDY/', ISO would be 'YMD-'
firstDay: 1 // The first day of the week, Sun = 0, Mon = 1, ...
};
this._defaults = { // Global defaults for all the calendar instances
autoPopUp: 'focus', // 'focus' for popup on focus,
// 'button' for trigger button, or 'both' for either
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
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: '2004:2013', // 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
minDate: null, // The earliest selectable date, or null for no limit
maxDate: null, // The latest selectable date, or null for no limit
speed: 'быстро', // Speed of display/closure
customDate: 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. popUpCal.noWeekends
fieldSettings: null, // Function that takes an input field and
// returns a set of custom settings for the calendar
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 calendar
rangeSeparator: ' - ' // Text between two dates in a range
};
$.extend(this._defaults, this.regional['']);
this._calendarDiv = $('<div id="calendar_div"></div>');
$(document.body).append(this._calendarDiv).mousedown(this._checkExternalClick);
}

$.extend(PopUpCal.prototype, {
/* Class name added to elements to indicate already configured with a calendar. */
markerClassName: 'hasCalendar',

/* Debug logging (if enabled). */
log: function () {
if (this.debug) {
console.log.apply('', arguments);
}
},

/* Register a new calendar instance - with custom settings. */
_register: function(inst) {
var id = this._nextId++;
this._inst[id] = inst;
return id;
},

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

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

/* Handle keystrokes. */
_doKeyDown: function(e) {
var inst = popUpCal._getInst(this._calId);
if (popUpCal._popUpShowing) {
switch (e.keyCode) {
case 9:  popUpCal.hideCalendar(inst, '');
break; // hide on tab out
case 13: popUpCal._selectDay(inst, inst._selectedMonth, inst._selectedYear,
$('td.calendar_daysCellOver', inst._calendarDiv)[0]);
break; // select the value on enter
case 27: popUpCal.hideCalendar(inst, inst._get('speed'));
break; // hide on escape
case 33: popUpCal._adjustDate(inst,
(e.ctrlKey ? -1 : -inst._get('stepMonths')), (e.ctrlKey ? 'Y' : 'M'));
break; // previous month/year on page up/+ ctrl
case 34: popUpCal._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) popUpCal._clearDate(inst);
break; // clear on ctrl+end
case 36: if (e.ctrlKey) popUpCal._gotoToday(inst);
break; // current on ctrl+home
case 37: if (e.ctrlKey) popUpCal._adjustDate(inst, -1, 'D');
break; // -1 day on ctrl+left
case 38: if (e.ctrlKey) popUpCal._adjustDate(inst, -7, 'D');
break; // -1 week on ctrl+up
case 39: if (e.ctrlKey) popUpCal._adjustDate(inst, +1, 'D');
break; // +1 day on ctrl+right
case 40: if (e.ctrlKey) popUpCal._adjustDate(inst, +7, 'D');
break; // +1 week on ctrl+down
}
}
else if (e.keyCode == 36 && e.ctrlKey) { // display the calendar on ctrl+home
popUpCal.showFor(this);
}
},

/* Filter entered characters. */
_doKeyPress: function(e) {
var inst = popUpCal._getInst(this._calId);
var chr = String.fromCharCode(e.charCode == undefined ? e.keyCode : e.charCode);
return (chr < ' ' || chr == inst._get('dateFormat').charAt(3) ||
			  (chr >= '0' && chr <= '9')); // only allow numbers and separator
									},
									
									/* Attach the calendar to an input field. */
									_connectCalendar: function(target, inst) {
									var input = $(target);
									if (this._hasClass(input, this.markerClassName)) {
									return;
									}
									var appendText = inst._get('appendText');
									if (appendText) {
									input.after('<span class="calendar_append">' + appendText + '</span>');
									}
									var autoPopUp = inst._get('autoPopUp');
									if (autoPopUp == 'focus' || autoPopUp == 'both') { // pop-up calendar when in the marked field
									input.focus(this.showFor);
									}
									if (autoPopUp == 'button' || autoPopUp == 'both') { // pop-up calendar when button clicked
									var buttonText = inst._get('buttonText');
									var buttonImage = inst._get('buttonImage');
									var buttonImageOnly = inst._get('buttonImageOnly');
									var trigger = $(buttonImageOnly ? '<img class="calendar_trigger" src="' +
																			buttonImage + '" alt="' + buttonText + '" title="' + buttonText + '"/>' :
									'<button type="button" class="calendar_trigger">' + (buttonImage != '' ?
										'<img src="' + buttonImage + '" alt="' + buttonText + '" title="' + buttonText + '"/>' :
										buttonText) + '</button>');
									input.wrap('<span class="calendar_wrap"></span>').after(trigger);
									trigger.click(this.showFor);
									}
									input.addClass(this.markerClassName).keydown(this._doKeyDown).keypress(this._doKeyPress);
									input[0]._calId = inst._id;
									},
									
									/* Attach an inline calendar to a div. */
									_inlineCalendar: function(target, inst) {
									var input = $(target);
									if (this._hasClass(input, this.markerClassName)) {
									return;
									}
									input.addClass(this.markerClassName).append(inst._calendarDiv);
									input[0]._calId = inst._id;
									this._updateCalendar(inst);
									inst._calendarDiv.resize(function() { popUpCal._inlineShow(inst); });
									},
									
									/* Tidy up after displaying the calendar. */
									_inlineShow: function(inst) {
									var numMonths = inst._get('numberOfMonths'); // fix width for dynamic number of calendars
									numMonths = (numMonths == null ? 1 : (typeof numMonths == 'number' ? numMonths : numMonths[1]));
									inst._calendarDiv.width(numMonths * $('.calendar', inst._calendarDiv[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 calendar 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 calendar instance's settings (anonymous object)
									@param  pos       int[2] - coordinates for the dialog's position within the screen
									leave empty for default (screen centre)
									@return void */
									dialogCalendar: function(dateText, onSelect, settings, pos) {
									var inst = this._dialogInst; // internal instance
									if (!inst) {
									inst = this._dialogInst = new PopUpCalInstance({}, 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 || // should use actual width/height below
									[($(window).width() / 2) - 100, ($(window).height() / 2) - 150];
									
									// Get position of window
									if ( document.documentElement && (document.documentElement.scrollTop)) {
									browserTopY = document.documentElement.scrollTop;
									}
									else {
									browserTopY = document.body.scrollTop;
									}	
									this._pos[1] = this._pos[1] + browserTopY; // add the browser position to the height
									
									// 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._calendarDiv.addClass('calendar_dialog');
									this.showFor(this._dialogInput[0]);
									if ($.blockUI) {
									$.blockUI(this._calendarDiv);
									}
									},
									
									/* Enable the input field(s) for entry.
									@param  inputs  element - single input field or
									string - the ID or other jQuery selector of the input field(s) or
									object - jQuery collection of input fields
									@return void */
									enableFor: function(inputs) {
									inputs = (inputs.jquery ? inputs : $(inputs));
									inputs.each(function() {
									this.disabled = false;
									$('../button.calendar_trigger', this).each(function() { this.disabled = false; });
									$('../img.calendar_trigger', this).css({opacity:'1.0',cursor:''});
									var $this = this;
									popUpCal._disabledInputs = $.map(popUpCal._disabledInputs,
									function(value) { return (value == $this ? null : value); }); // delete entry
									});
									},
									
									/* Disable the input field(s) from entry.
									@param  inputs  element - single input field or
									string - the ID or other jQuery selector of the input field(s) or
									object - jQuery collection of input fields
									@return void */
									disableFor: function(inputs) {
									inputs = (inputs.jquery ? inputs : $(inputs));
									inputs.each(function() {
									this.disabled = true;
									$('../button.calendar_trigger', this).each(function() { this.disabled = true; });
									$('../img.calendar_trigger', this).css({opacity:'0.5',cursor:'default'});
									var $this = this;
									popUpCal._disabledInputs = $.map(popUpCal._disabledInputs,
									function(value) { return (value == $this ? null : value); }); // delete entry
									popUpCal._disabledInputs[popUpCal._disabledInputs.length] = this;
									});
									},
									
									/* Update the settings for a calendar attached to an input field or division.
									@param  control   element - the input field or div/span attached to the calendar or
									string - the ID or other jQuery selector of the input field
									@param  settings  object - the new settings to update
									@return void */
									reconfigureFor: function(control, settings) {
									control = (typeof control == 'string' ? $(control)[0] : control);
									var inst = this._getInst(control._calId);
									if (inst) {
									extendRemove(inst._settings, settings || {});
									this._updateCalendar(inst);
									}
									},
									
									/* Set the date for a calendar attached to an input field or division.
									@param  control  element - the input field or div/span attached to the calendar or
									string - the ID or other jQuery selector of the input field
									@param  date     Date - the new date
									@return void */
									setDateFor: function(control, date) {
									control = (typeof control == 'string' ? $(control)[0] : control);
									var inst = this._getInst($(control)[0]._calId);
									if (inst) {
									inst._setDate(date);
									this._updateCalendar(inst);
									}
									},
									
									/* Retrieve the date for a calendar attached to an input field or division.
									@param  control  element - the input field or div/span attached to the calendar or
									string - the ID or other jQuery selector of the input field
									@return Date - the current date */
									getDateFor: function(control) {
									control = (typeof control == 'string' ? $(control)[0] : control);
									var inst = this._getInst(control._calId);
									return (inst ? inst._getDate() : null);
									},
									
									/* Pop-up the calendar for a given input field.
									@param  target  element - the input field attached to the calendar or
									string - the ID or other jQuery selector of the input field
									@return void */
									showFor: function(target) {
									target = (typeof target == 'string' ? $(target)[0] : target);
									var input = (target.nodeName && target.nodeName.toLowerCase() == 'input' ? target : this);
									if (input.nodeName.toLowerCase() != 'input') { // find from button/image trigger
									input = $('input', input.parentNode)[0];
									}
									if (popUpCal._lastInput == input) { // already here
									return;
									}
									for (var i = 0; i < popUpCal._disabledInputs.length; i++) {  // check not disabled
														if (popUpCal._disabledInputs[i] == input) {
														return;
														}
														}
														var inst = popUpCal._getInst(input._calId);
														var fieldSettings = inst._get('fieldSettings');
														extendRemove(inst._settings, (fieldSettings ? fieldSettings(input) : {}));
														popUpCal.hideCalendar(inst, '');
														popUpCal._lastInput = input;
														inst._setDateFromField(input);
														if (popUpCal._inDialog) { // hide cursor
														input.value = '';
														}
														if (!popUpCal._pos) { // position below input
														popUpCal._pos = popUpCal._findPos(input);
														popUpCal._pos[1] += input.offsetHeight; // add the height
														}
														inst._calendarDiv.css('position', (popUpCal._inDialog && $.blockUI ? 'static' : 'absolute')).
														css('left', popUpCal._pos[0] + 'px').css('top', popUpCal._pos[1] + 'px');
														popUpCal._pos = null;
														popUpCal._showCalendar(inst);
														},
														
														/* Construct and display the calendar. */
														_showCalendar: function(id) {
														var inst = this._getInst(id);
														inst._rangeStart = null;
														this._updateCalendar(inst);
														if (!inst._inline) {
														var speed = inst._get('speed');
														var postProcess = function() {
														popUpCal._popUpShowing = true;
														popUpCal._afterShow(inst);
														};
														inst._calendarDiv.show(speed, postProcess);
														if (speed == '') {
														postProcess();
														}
														if (inst._input[0].type != 'hidden') {
														inst._input[0].focus();
														}
														this._curInst = inst;
														}
														},
														
														/* Generate the calendar content. */
														_updateCalendar: function(inst) {
														inst._calendarDiv.empty().append(inst._generateCalendar());
														if (inst._get('numberOfMonths') != 1) {
														inst._calendarDiv.addClass('calendar_multi');
														} 
														else {
														inst._calendarDiv.removeClass('calendar_multi');
														}
														if (inst._input && inst._input[0].type != 'hidden') {
														inst._input[0].focus();
														}
														},
														
														/* Tidy up after displaying the calendar. */
														_afterShow: function(inst) {
														var numMonths = inst._get('numberOfMonths'); // fix width for dynamic number of calendars
														numMonths = (numMonths == null ? 1 : (typeof numMonths == 'number' ? numMonths : numMonths[1]));
														inst._calendarDiv.width(numMonths * $('.calendar', inst._calendarDiv[0]).width());
														if ($.browser.msie) { // fix IE < 7 select problems
																				$('#calendar_cover').css({width: inst._calendarDiv.width() + 4,
																				height: inst._calendarDiv.height() + 4});
																				}
																				// re-position on screen if necessary
																				var pos = popUpCal._findPos(inst._input[0]);
																				browserWidth = $(window).width();
																				if (document.documentElement && (document.documentElement.scrollLeft)) {
																				browserX = document.documentElement.scrollLeft;	
																				}
																				else {
																				browserX = document.body.scrollLeft;
																				}
																				// reposition calendar if outside the browser window
																				if ((inst._calendarDiv.offset().left + inst._calendarDiv.width()) > (browserWidth + browserX)) {
															inst._calendarDiv.css('left', (pos[0] + $(inst._input[0]).width() - inst._calendarDiv.width()) + 'px');
															}
															browserHeight = $(window).height();
															if (document.documentElement && (document.documentElement.scrollTop)) {
															browserTopY = document.documentElement.scrollTop;
															} 
															else {
															browserTopY = document.body.scrollTop;
															}
															// reposition calendar if outside the browser window
															if ((inst._calendarDiv.offset().top + inst._calendarDiv.height()) > (browserTopY + browserHeight) ) {
															inst._calendarDiv.css('top', (pos[1] - inst._calendarDiv.height()) + 'px');
															}
															},
															
															/* Hide the calendar from view.
															@param  id     string/object - the ID of the current calendar instance,
															or the instance itself
															@param  speed  string - the speed at which to close the calendar
															@return void */
															hideCalendar: function(id, speed) {
															var inst = this._getInst(id);
															var rangeSelect = inst._get('rangeSelect');
															if (rangeSelect && this._stayOpen) {
															this._appendDate = true;
															this._selectDate(id, inst._formatDate());
															}
															this._stayOpen = false;
															if (this._popUpShowing) {
															speed = (speed != null ? speed : inst._get('speed'));
															inst._calendarDiv.hide(speed, function() {
															popUpCal._tidyDialog(inst);
															});
															if (speed == '') {
															this._tidyDialog(inst);
															}
															this._popUpShowing = 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._calendarDiv);
															}
															}
															this._inDialog = false;
															}
															this._curInst = null;
															},
															
															/* Tidy up after a dialog display. */
															_tidyDialog: function(inst) {
															inst._calendarDiv.removeClass('calendar_dialog');
															$('.calendar_prompt', inst._calendarDiv).remove();
															},
															
															/* Close calendar if clicked elsewhere. */
															_checkExternalClick: function(event) {
															if (!popUpCal._curInst) {
															return;
															}
															var target = $(event.target);
															if( (target.parents("#calendar_div").length == 0)
															&& (target.attr('class') != 'calendar_trigger')
															&& popUpCal._popUpShowing 
															&& !(popUpCal._inDialog && $.blockUI) )
															{
															popUpCal.hideCalendar(popUpCal._curInst, '');
															}
															},
															
															/* Adjust one of the date sub-fields. */
															_adjustDate: function(id, offset, period) {
															var inst = this._getInst(id);
															inst._adjustDate(offset, period);
															this._updateCalendar(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, a) {
															var inst = this._getInst(id);
															var dayNames = inst._get('dayNames');
															var value = a.firstChild.nodeValue;
															for (var i = 0; i < 7; i++) {
																				if (dayNames[i] == value) {
																				inst._settings.firstDay = i;
																				break;
																				}
																				}
																				this._updateCalendar(inst);
																				},
																				
																				/* Action for selecting a day. */
																				_selectDay: function(id, month, year, td) {
																				var inst = this._getInst(id);
																				var rangeSelect = inst._get('rangeSelect');
																				if (rangeSelect) {
																				if (!this._stayOpen) {
																				this._stayOpen = true;
																				$('.calendar td').removeClass('calendar_currentDay');
																				$(td).addClass('calendar_currentDay');
																				} 
																				else {
																				this._appendDate = true;
																				this._stayOpen = false;
																				}
																				}
																				inst._selectedDay = $("a", td).html();
																				inst._selectedMonth = month;
																				inst._selectedYear = year;
																				this._selectDate(id);
																				if (this._stayOpen) {
																				inst._endDay = inst._endMonth = inst._endYear = null;
																				inst._rangeStart = new Date(inst._selectedYear, inst._selectedMonth, inst._selectedDay);
																				this._updateCalendar(inst);
																				}
																				else if (rangeSelect) {
																				if (inst._inline) {
																				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;
																				this._updateCalendar(inst);
																				}
																				else {
																				inst._rangeStart = null;
																				}
																				}
																				},
																				
																				/* Erase the input field and hide the calendar. */
																				_clearDate: function(id) {
																				this._selectDate(id, '');
																				},
																				
																				/* Update the input field with the selected date. */
																				_selectDate: function(id, dateStr) {
																				var inst = this._getInst(id);
																				dateStr = (dateStr != null ? dateStr : inst._formatDate());
																				if (this._appendDate) {
																				dateStr = inst._formatDate(inst._rangeStart) + inst._get('rangeSeparator') + dateStr;
																				this._appendDate = false;
																				}
																				if (inst._input) {
																				inst._input.val(dateStr);
																				}
																				var onSelect = inst._get('onSelect');
																				if (onSelect) {
																				onSelect(dateStr, inst);  // trigger custom callback
																				}
																				else {
																				inst._input.trigger('change'); // fire the change event
																				}
																				if (inst._inline) {
																				this._updateCalendar(inst);
																				}
																				else {
																				if (!this._stayOpen) {
																				this.hideCalendar(inst, inst._get('speed'));
																				}
																				}
																				},
																				
																				/* Set as customDate 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), ''];
																				},
																				
																				/* 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];
																				}
																				});
																				
																				/* Individualised settings for calendars applied to one or more related inputs.
																				Instances are managed and manipulated through the PopUpCal manager. */
																				function PopUpCalInstance(settings, inline) {
																				this._id = popUpCal._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._calendarDiv = (!inline ? popUpCal._calendarDiv :
																				$('<div id="calendar_div_' + this._id + '" class="calendar_inline"></div>'));
																				// customise the calendar object - uses manager defaults if not overridden
																				this._settings = extendRemove({}, settings || {}); // clone
																				if (inline) {
																				this._setDate(this._getDefaultDate());
																				}
																				}
																				
																				$.extend(PopUpCalInstance.prototype, {
																				/* Get a setting value, defaulting if necessary. */
																				_get: function(name) {
																				return (this._settings[name] != null ? this._settings[name] : popUpCal._defaults[name]);
																				},
																				
																				/* Parse existing date and initialise calendar. */
																				_setDateFromField: function(input) {
																				this._input = $(input);
																				var dateFormat = this._get('dateFormat');
																				var currentDate = this._input.val().split(dateFormat.charAt(3));
																				this._endDay = this._endMonth = this._endYear = null;
																				if (currentDate.length == 3) {
																				this._currentDay = parseInt(currentDate[dateFormat.indexOf('D')], 10);
																				this._currentMonth = parseInt(currentDate[dateFormat.indexOf('M')], 10) - 1;
																				this._currentYear = parseInt(currentDate[dateFormat.indexOf('Y')], 10);
																				} 
																				else if (currentDate.length == 5) { // if it's a date range
																				currentDateArray = this._input.val().split(this._get('rangeSeparator'));
																				currentDate = currentDateArray[0].split(dateFormat.charAt(3));
																				this._currentDay = parseInt(currentDate[dateFormat.indexOf('D')], 10);
																				this._currentMonth = parseInt(currentDate[dateFormat.indexOf('M')], 10) - 1;
																				this._currentYear = parseInt(currentDate[dateFormat.indexOf('Y')], 10);
																				currentDate = currentDateArray[1].split(dateFormat.charAt(3));
																				this._endDay = parseInt(currentDate[dateFormat.indexOf('D')], 10);
																				this._endMonth = parseInt(currentDate[dateFormat.indexOf('M')], 10) - 1;
																				this._endYear = parseInt(currentDate[dateFormat.indexOf('Y')], 10);
																				}
																				else {
																				var date = this._getDefaultDate();
																				this._currentDay = date.getDate();
																				this._currentMonth = date.getMonth();
																				this._currentYear = date.getFullYear();
																				}
																				this._selectedDay = this._currentDay;
																				this._selectedMonth = this._currentMonth;
																				this._selectedYear = this._currentYear;
																				this._adjustDate();
																				},
																				
																				/* Retrieve the default date shown on opening. */
																				_getDefaultDate: function() {
																				var offsetDate = function(offset) {
																				var date = new Date();
																				date.setDate(date.getDate() + offset);
																				return date;
																				};
																				var defaultDate = this._get('defaultDate');
																				return (defaultDate == null ? new Date() :
																				(typeof defaultDate == 'number' ? offsetDate(defaultDate) : defaultDate));
																				},
																				
																				/* Set the date directly. */
																				_setDate: function(date) {
																				this._selectedDay = this._currentDay = date.getDate();
																				this._selectedMonth = this._currentMonth = date.getMonth();
																				this._selectedYear = this._currentYear = date.getFullYear();
																				this._adjustDate();
																				},
																				
																				/* Retrieve the date directly. */
																				_getDate: function() {
																				return new Date(this._currentYear, this._currentMonth, this._currentDay);
																				},
																				
																				/* Generate the HTML for the current state of the calendar. */
																				_generateCalendar: function() {
																				var today = new Date();
																				today = new Date(today.getFullYear(), today.getMonth(), today.getDate()); // clear time
																				// build the calendar HTML
																				var controls = '<div class="calendar_control">' +
																				'<div class="calendar_clear"><a onclick="popUpCal._clearDate(' + this._id + ');">' +
																				this._get('clearText') + '</a></div>' +
																		'<div class="calendar_close"><a onclick="popUpCal.hideCalendar(' + this._id + ');">' +
																				this._get('closeText') + '</a></div></div>';
																	var prompt = this._get('prompt');
																	var closeAtTop = this._get('closeAtTop');
																	var hideIfNoPrevNext = this._get('hideIfNoPrevNext');
																	var numMonths = this._get('numberOfMonths');
																	var stepMonths = this._get('stepMonths');
																	var isMultiMonth = (numMonths != 1);
																	numMonths = (numMonths == null ? [1, 1] : (typeof numMonths == 'number' ? [1, numMonths] : numMonths));
																	// controls and links
																	var html = (prompt ? '<div class="calendar_prompt">' + prompt + '</div>' : '') +
																	(closeAtTop && !this._inline ? controls : '') +
																	'<div class="calendar_links"><div class="calendar_prev">' +
																			(this._canAdjustMonth(-1) ? '<a onclick="popUpCal._adjustDate(' + this._id +
																				', -' + stepMonths + ', \'M\');">' + this._get('prevText') + '</a>' :
																			(hideIfNoPrevNext ? '' : '<label>' + this._get('prevText') + '</label>')) + '</div>' +
																		(this._isInRange(today) ? '<div class="calendar_current"><a ' +
																				'onclick="popUpCal._gotoToday(' + this._id + ');">' + this._get('currentText') + '</a></div>' : '') +
																		'<div class="calendar_next">' +
																			(this._canAdjustMonth(+1) ? '<a onclick="popUpCal._adjustDate(' + this._id +
																				', +' + stepMonths + ', \'M\');">' + this._get('nextText') + '</a>' :
																			(hideIfNoPrevNext ? '' : '<label>' + this._get('nextText') + '</label>')) + '</div></div>';
																	var minDate = this._getMinDate();
																	var maxDate = this._get('maxDate');
																	var drawMonth = this._selectedMonth;
																	var drawYear = this._selectedYear;
																	for (var row = 0; row < numMonths[0]; row++) {
																				for (var col = 0; col < numMonths[1]; col++) {
																				html += '<div class="calendar_oneMonth' + (col == 0 ? ' calendar_newRow' : '') + '">' +
																				this._generateMonthYearHeader(drawMonth, drawYear, minDate, maxDate, row > 0 || col > 0) + // draw month headers
																				'<table class="calendar" cellpadding="0" cellspacing="0"><thead>' + 
																				'<tr class="calendar_titleRow">';
																				var firstDay = this._get('firstDay');
																				var changeFirstDay = this._get('changeFirstDay');
																				var dayNames = this._get('dayNames');
																				for (var dow = 0; dow < 7; dow++) { // days of the week
																				html += '<td>' + (!changeFirstDay ? '' :
																				'<a onclick="popUpCal._changeFirstDay(' + this._id + ', this);">') +
																				dayNames[(dow + firstDay) % 7] + (changeFirstDay ? '</a>' : '') + '</td>';
																		}
																		html += '</tr></thead><tbody>';
																	var daysInMonth = this._getDaysInMonth(drawYear, drawMonth);
																	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 selectedDate = new Date(drawYear, drawMonth, this._selectedDay);
																	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 customDate = this._get('customDate');
																	var showOtherMonths = this._get('showOtherMonths');
																	var count = 0;
																	for (var dRow = 0; dRow < numRows; dRow++) { // create calendar rows
																				html += '<tr class="calendar_daysRow">';
																				for (var dow = 0; dow < 7; dow++) { // create calendar days
																				var customSettings = (customDate ? customDate(printDate) : [true, '']);
																				var otherMonth = (printDate.getMonth() != drawMonth);
																				var unselectable = otherMonth || !customSettings[0] ||
																				(minDate && printDate < minDate) || (maxDate && printDate > maxDate);
																				html += '<td class="calendar_daysCell' +
																				((dow + firstDay + 6) % 7 >= 5 ? ' calendar_weekEndCell' : '') + // highlight weekends
																				(otherMonth ? ' calendar_otherMonth' : '') + // highlight days from other months
																				(printDate.getTime() == selectedDate.getTime() && drawMonth == this._selectedMonth ? ' calendar_daysCellOver' : '') + // highlight selected day
																				(unselectable ? ' calendar_unselectable' : '') +  // highlight unselectable days
																				(otherMonth && !showOtherMonths ? '' : ' ' + customSettings[1] + // highlight custom dates
																				(printDate.getTime() >= currentDate.getTime() && printDate.getTime() <= endDate.getTime() ?  // in current range
																				' calendar_currentDay' : // highlight selected day
																				(printDate.getTime() == today.getTime() ? ' calendar_today' : ''))) + '"' + // highlight today (if different)
																				(unselectable ? '' : ' onmouseover="$(this).addClass(\'calendar_daysCellOver\');"' +
																				' onmouseout="$(this).removeClass(\'calendar_daysCellOver\');"' +
																				' onclick="popUpCal._selectDay(' + this._id + ',' + drawMonth + ',' + drawYear + ', this);"') + '>' + // actions
																				(otherMonth ? (showOtherMonths ? printDate.getDate() : '&nbsp;') : // 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 += (!closeAtTop && !this._inline ? controls : '') +
															'<div style="clear: both;"></div>' + (!$.browser.msie ? '' :
															'<!--[if lte IE 6.5]><iframe src="javascript:false;" class="calendar_cover"></iframe><![endif]-->');
															return html;
															},
															
															/* Generate the month and year header. */
															_generateMonthYearHeader: function(drawMonth, drawYear, minDate, maxDate, secondary) {
															var html = '<div class="calendar_header">';
																// month selection
																var monthNames = this._get('monthNames');
																if (secondary || !this._get('changeMonth')) {
																html += monthNames[drawMonth] + '&nbsp;';
																}
																else {
																var inMinYear = (minDate && minDate.getFullYear() == drawYear);
																var inMaxYear = (maxDate && maxDate.getFullYear() == drawYear);
																html += '<select class="calendar_newMonth" ' +
																				'onchange="popUpCal._selectMonthYear(' + this._id + ', this, \'M\');" ' +
																				'onclick="popUpCal._clickMonthYear(' + this._id + ');">';
																	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="calendar_newYear" ' +
																				'onchange="popUpCal._selectMonthYear(' + this._id + ', this, \'Y\');" ' +
																				'onclick="popUpCal._clickMonthYear(' + this._id + ');">';
																				for (; year <= endYear; year++) {
																				html += '<option value="' + year + '"' +
																				(year == drawYear ? ' selected="selected"' : '') +
																				'>' + year + '</option>';
																				}
																				html += '</select>';
																			}
																			html += '</div>'; // Close calendar_header
																		return html;
																		},
																		
																		/* Adjust one of the date sub-fields. */
																		_adjustDate: function(offset, period) {
																		var date = new Date(this._selectedYear + (period == 'Y' ? offset : 0),
																		this._selectedMonth + (period == 'M' ? offset : 0),
																		this._selectedDay + (period == 'D' ? offset : 0));
																		// ensure it is within the bounds set
																		var minDate = this._getMinDate();
																		var maxDate = this._get('maxDate');
																		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 current minimum date - may be overridden for a range. */
																			_getMinDate: function() {
																			var minDate = this._get('minDate');
																			return (!this._rangeStart ? minDate :
																			(!minDate || this._rangeStart > minDate ? this._rangeStart : minDate));
																			},
																			
																			/* 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) {
																			var date = new Date(this._selectedYear, this._selectedMonth + offset, 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) {
																				var minDate = this._get('minDate');
																				var maxDate = this._get('maxDate');
																				return ((!minDate || date >= minDate) && (!maxDate || date <= maxDate));
																				},
																				
																				/* Format the given date for display. */
																				_formatDate: function(day, month, year) {
																				if (!day) {
																				day = this._currentDay = this._selectedDay;
																				month = this._currentMonth = this._selectedMonth;
																				year = this._currentYear = this._selectedYear;
																				}
																				else if (typeof day == 'object') {
																				year = day.getFullYear();
																				month = day.getMonth();
																				day = day.getDate();
																				}
																				month++; // adjust javascript month
																				var dateFormat = this._get('dateFormat');
																				var dateString = '';
																				for (var i = 0; i < 3; i++) {
																				dateString += dateFormat.charAt(3) +
																				(dateFormat.charAt(i) == 'D' ? (day < 10 ? '0' : '') + day :
																				(dateFormat.charAt(i) == 'M' ? (month < 10 ? '0' : '') + month :
																				(dateFormat.charAt(i) == 'Y' ? year : '?')));
																				}
																				return dateString.substring(dateFormat.charAt(3) ? 1 : 0);
																				}
																				});
																				
																				/* 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 calendar to a jQuery selection.
																				@param  settings  object - the new settings to use for this calendar instance (anonymous)
																				@return jQuery object - for chaining further calls */
																				$.fn.calendar = function(settings) {
																				return this.each(function() {
																				// check for settings on the control itself - in namespace 'cal:'
																				var inlineSettings = null;
																				for (attrName in popUpCal._defaults) {
																				var attrValue = this.getAttribute('cal:' + 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 PopUpCalInstance(instSettings, false));
																				popUpCal._connectCalendar(this, inst);
																				} 
																				else if (nodeName == 'div' || nodeName == 'span') {
																				var instSettings = $.extend($.extend({}, settings || {}),
																				inlineSettings || {}); // clone and customise
																				var inst = new PopUpCalInstance(instSettings, true);
																				popUpCal._inlineCalendar(this, inst);
																				}
																				});
																				};
																				
																				/* Initialise the calendar. */
																				$(document).ready(function() {
																				popUpCal = new PopUpCal(); // singleton instance
																				});
																				
																				})(jQuery);

