var CalendarBehaviour = {
		initialise: function () {
		  this.calendarObj = Calendar.setup({
		    inputField  : this.id,         // ID of the input field
		    ifFormat    : "%d/%m/%Y",    // the date format
		    button      : this.id + '-button',       // ID of the button
		    flat				: this.id + "-calendar",
		    onSelect		: this.calendarclose.bind(this)
		  });
		  
		  this.isOpen = false;
		  this.calendar = $(this.id + "-calendar");
		  this.icon = $(this.id + "-icon");
		
		  this.icon.onclick = this.toggle.bind(this);
		  
		  if(!Calendar.ALL) Calendar.ALL = [];
		  Calendar.ALL[Calendar.ALL.length] = this.calendar;
		},

		onblur: function() {
			// close the calendar
			if( this.validateDate() )
				this.close();
			else
				this.setToToday();
			return true;
		},
		
		setToToday: function() {
			var date = new Date();
			this.value = date.getDate() + '/' + ( date.getMonth() + 1	) + '/' + date.getYear();
		},
		
		validateDate: function() {
			var today = new Date();
			today.setHours(0);
			today.setMinutes(0);
			today.setSeconds(0);
			today.setMilliseconds(0);
			
			// this element's date can only be set in the future
			if( Element.hasClassName( this.parentNode, 'futureonly' ) ) {
				
				var dateParts = this.value.split('/');
				var enteredDate = new Date();
				
				if( dateParts[2].length == 2 )
					dateParts[2] = '20' + dateParts[2];
				
				enteredDate.setTime( Date.parse( dateParts[2] + '/' + dateParts[1] + '/' + dateParts[0] ) );
				if( enteredDate < today ) {
					alert('Cannot enter date in the past into that field');
					return false;
				}
			}
			
			return true;
		},

		/*
		onclick : function() { this.toggle(); },
		*/
		
		// onfocus : function() { this.toggle(); },
		
		toggle : function() {
			if(this.isOpen) this.close();
			else this.open();
		},
		
		open : function() {
			this.isOpen = true;
			var i,calendar;
			for(i=0;calendar=Calendar.ALL[i];i++) {
				if(calendar == this.calendar) Element.addClassName(calendar, 'focused');
				else Element.removeClassName(calendar, 'focused');
			}

			if(navigator.appVersion.indexOf('MSIE 6') > -1) {
				this.calendar.style.zIndex = 12000;

				var hiderFrame = $('hiderFrame');
				if(!hiderFrame) {
					hiderFrame = document.createElement('iframe');
	
					hiderFrame.id = 'hiderFrame';
					hiderFrame.style.zIndex = 10000;
					hiderFrame.style.filter = "progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0);";
					
					// document.body.appendChild(hiderFrame);
				}
	
				var dims = Element.getDimensions(this.calendar);
				var pos = Position.cumulativeOffset(this.calendar);
				
				hiderFrame.style.position = 'absolute';
				hiderFrame.style.left = pos[0] + 'px';
				hiderFrame.style.top = pos[1] + 'px';
				hiderFrame.style.width = dims.width + 'px';
				hiderFrame.style.height = dims.height + 'px';
				hiderFrame.style.display = 'block';
			}
			
		},
		close : function() {
			this.isOpen = false;
			Element.removeClassName(this.calendar, 'focused');
			
			if($('hiderFrame')) $('hiderFrame').style.display = 'none';
		},
		
		calendarclose: function(cal) {
			if(cal.dateClicked) {
				this.value = cal.date.print(cal.params.ifFormat);
				if(this.onchange) this.onchange();
				if(this.onblur) this.onblur();
				this.close();
			}
		},
		destroy: function() {
			if(this.calendarObj) this.calendarObj.destroy();
			this.calendar = null;
			this.calendarObj = null;
			this.onclick = null;
			Calendar.ALL = null;
		}			
	}

Behaviour.register( {
	'div.calendardate input' : CalendarBehaviour,
	'li.calendardate input' : CalendarBehaviour
} );

/*  Copyright Mihai Bazon, 2002, 2003  |  http://dynarch.com/mishoo/
 * ---------------------------------------------------------------------------
 *
 * The DHTML Calendar
 *
 * Details and latest version at:
 * http://dynarch.com/mishoo/calendar.epl
 *
 * This script is distributed under the GNU Lesser General Public License.
 * Read the entire license text here: http://www.gnu.org/licenses/lgpl.html
 *
 * This file defines helper functions for setting up the calendar.  They are
 * intended to help non-programmers get a working calendar on their site
 * quickly.  This script should not be seen as part of the calendar.  It just
 * shows you what one can do with the calendar, while in the same time
 * providing a quick and simple method for setting it up.  If you need
 * exhaustive customization of the calendar creation process feel free to
 * modify this code to suit your needs (this is recommended and much better
 * than modifying calendar.js itself).
 */

/**
 *  This function "patches" an input field (or other element) to use a calendar
 *  widget for date selection.
 *
 *  The "params" is a single object that can have the following properties:
 *
 *    prop. name   | description
 *  -------------------------------------------------------------------------------------------------
 *   inputField    | the ID of an input field to store the date
 *   displayArea   | the ID of a DIV or other element to show the date
 *   button        | ID of a button or other element that will trigger the calendar
 *   eventName     | event that will trigger the calendar, without the "on" prefix (default: "click")
 *   ifFormat      | date format that will be stored in the input field
 *   daFormat      | the date format that will be used to display the date in displayArea
 *   singleClick   | (true/false) wether the calendar is in single click mode or not (default: true)
 *   firstDay      | numeric: 0 to 6.  "0" means display Sunday first, "1" means display Monday first, etc.
 *   align         | alignment (default: "Br"); if you don't know what's this see the calendar documentation
 *   range         | array with 2 elements.  Default: [1900, 2999] -- the range of years available
 *   weekNumbers   | (true/false) if it's true (default) the calendar will display week numbers
 *   flat          | null or element ID; if not null the calendar will be a flat calendar having the parent with the given ID
 *   flatCallback  | function that receives a JS Date object and returns an URL to point the browser to (for flat calendar)
 *   disableFunc   | function that receives a JS Date object and should return true if that date has to be disabled in the calendar
 *   onSelect      | function that gets called when a date is selected.  You don't _have_ to supply this (the default is generally okay)
 *   onClose       | function that gets called when the calendar is closed.  [default]
 *   onUpdate      | function that gets called after the date is updated in the input field.  Receives a reference to the calendar.
 *   date          | the date that the calendar will be initially displayed to
 *   showsTime     | default: false; if true the calendar will include a time selector
 *   timeFormat    | the time format; can be "12" or "24", default is "12"
 *   electric      | if true (default) then given fields/date areas are updated for each move; otherwise they're updated only on close
 *   step          | configures the step of the years in drop-down boxes; default: 2
 *   position      | configures the calendar absolute position; default: null
 *   cache         | if "true" (but default: "false") it will reuse the same calendar object, where possible
 *   showOthers    | if "true" (but default: "false") it will show days from other months too
 *
 *  None of them is required, they all have default values.  However, if you
 *  pass none of "inputField", "displayArea" or "button" you'll get a warning
 *  saying "nothing to setup".
 */
Calendar.setup = function (params) {
	function param_default(pname, def) { if (typeof params[pname] == "undefined") { params[pname] = def; } };

	param_default("inputField",     null);
	param_default("displayArea",    null);
	param_default("button",         null);
	param_default("eventName",      "click");
	param_default("ifFormat",       "%Y/%m/%d");
	param_default("daFormat",       "%Y/%m/%d");
	param_default("singleClick",    true);
	param_default("disableFunc",    null);
	param_default("dateStatusFunc", params["disableFunc"]);	// takes precedence if both are defined
	param_default("dateText",       null);
	param_default("firstDay",       null);
	param_default("align",          "Br");
	param_default("range",          [1900, 2999]);
	param_default("weekNumbers",    true);
	param_default("flat",           null);
	param_default("flatCallback",   null);
	param_default("onSelect",       null);
	param_default("onClose",        null);
	param_default("onUpdate",       null);
	param_default("date",           null);
	param_default("showsTime",      false);
	param_default("timeFormat",     "24");
	param_default("electric",       true);
	param_default("step",           2);
	param_default("position",       null);
	param_default("cache",          false);
	param_default("showOthers",     false);
	param_default("multiple",       null);

	var tmp = ["inputField", "displayArea", "button"];
	for (var i in tmp) {
		if (typeof params[tmp[i]] == "string") {
			params[tmp[i]] = document.getElementById(params[tmp[i]]);
		}
	}
	if (!(params.flat || params.multiple || params.inputField || params.displayArea || params.button)) {
		alert("Calendar.setup:\n  Nothing to setup (no fields found).  Please check your code");
		return false;
	}

	function onSelect(cal) {
		var p = cal.params;
		var update = (cal.dateClicked || p.electric);
		if (update && p.inputField) {
			p.inputField.value = cal.date.print(p.ifFormat);
			if (typeof p.inputField.onchange == "function")
				p.inputField.onchange();
		}
		if (update && p.displayArea)
			p.displayArea.innerHTML = cal.date.print(p.daFormat);
		if (update && typeof p.onUpdate == "function")
			p.onUpdate(cal);
		if (update && p.flat) {
			if (typeof p.flatCallback == "function")
				p.flatCallback(cal);
		}
		if (update && p.singleClick && cal.dateClicked)
			cal.callCloseHandler();
	};

	if (params.flat != null) {
		if (typeof params.flat == "string")
			params.flat = document.getElementById(params.flat);
		if (!params.flat) {
			alert("Calendar.setup:\n  Flat specified but can't find parent.");
			return false;
		}
		var cal = new Calendar(params.firstDay, params.date, params.onSelect || onSelect);
		cal.showsOtherMonths = params.showOthers;
		cal.showsTime = params.showsTime;
		cal.time24 = (params.timeFormat == "24");
		cal.params = params;
		cal.weekNumbers = params.weekNumbers;
		cal.setRange(params.range[0], params.range[1]);
		cal.setDateStatusHandler(params.dateStatusFunc);
		cal.getDateText = params.dateText;
		if (params.ifFormat) {
			cal.setDateFormat(params.ifFormat);
		}

		cal.create(params.flat);
		if (params.inputField && typeof params.inputField.value == "string") {
			cal.parseDate(params.inputField.value);
		}

		cal.show();
		return cal;
	}

	var triggerEl = params.button || params.displayArea || params.inputField;
	triggerEl["on" + params.eventName] = function() {
		var dateEl = params.inputField || params.displayArea;
		var dateFmt = params.inputField ? params.ifFormat : params.daFormat;
		var mustCreate = false;
		var cal = window.calendar;
		if (dateEl)
			params.date = Date.parseDate(dateEl.value || dateEl.innerHTML, dateFmt);
		if (!(cal && params.cache)) {
			window.calendar = cal = new Calendar(params.firstDay,
							     params.date,
							     params.onSelect || onSelect,
							     params.onClose || function(cal) { cal.hide(); });
			cal.showsTime = params.showsTime;
			cal.time24 = (params.timeFormat == "24");
			cal.weekNumbers = params.weekNumbers;
			mustCreate = true;
		} else {
			if (params.date)
				cal.setDate(params.date);
			cal.hide();
		}
		if (params.multiple) {
			cal.multiple = {};
			for (var i = params.multiple.length; --i >= 0;) {
				var d = params.multiple[i];
				var ds = d.print("%Y%m%d");
				cal.multiple[ds] = d;
			}
		}
		cal.showsOtherMonths = params.showOthers;
		cal.yearStep = params.step;
		cal.setRange(params.range[0], params.range[1]);
		cal.params = params;
		cal.setDateStatusHandler(params.dateStatusFunc);
		cal.getDateText = params.dateText;
		cal.setDateFormat(dateFmt);
		if (mustCreate)
			cal.create();
		cal.refresh();
		if (!params.position)
			cal.showAtElement(params.button || params.displayArea || params.inputField, params.align);
		else
			cal.showAt(params.position[0], params.position[1]);
		return false;
	};

	return cal;
};