/*
	****************************************************
	Author : Lea Smart
	Source : www.totallysmartit.com
	Date : 7/3/2001
	DHTML Calendar
	Version 1.1
	
	You are free to use this code if you retain this header.
	You do not need to link to my site (be nice though!)
	******************************************************
	*/
	var timeoutDelay = 2000; // milliseconds, change this if you like, set to 0 for the calendar to never auto disappear
	
	var curYear = new Date();
	var yearSpan;  // number of years before and after current to show in dropdown
	yearSpan = 5;
	curYear = curYear.getFullYear();

	// preload images
	var imgUp = new Image(8,12);
	imgUp.src = 'images/up.gif';
	var imgDown = new Image(8,12);
	imgDown.src = 'images/down.gif';
	
	// used by timeout auto hide functions
	var timeoutId = false;
	
	// the now standard browser sniffer class
	function Browser(){
	  this.dom = document.getElementById?1:0;
	  this.ie4 = (document.all && !this.dom)?1:0;
	  this.ns4 = (document.layers && !this.dom)?1:0;
	  this.ns6 = (this.dom && !document.all)?1:0;
	  this.ie5 = (this.dom && document.all)?1:0;
	  this.ok = this.dom || this.ie4 || this.ns4;
	  this.platform = navigator.platform;
	}
	var browser = new Browser();
		
	// dom browsers require this written to the HEAD section
	
	if (browser.dom || browser.ie4){
	    document.writeln('<style>');
		document.writeln('#container {');
		document.writeln('position : absolute;');
		document.writeln('left : 100px;');
		document.writeln('top : 100px;');
		document.writeln('width : 10px;');;
		document.writeln('height : 145px;');
		document.writeln('clip:rect(0px 150px 145px 0px);');
		document.writeln('visibility : hidden;');
		document.writeln('z-index : 230;');
		document.writeln('background-color : #ffffff');
		document.writeln('}');
		document.writeln('</style>')
	}
	
	var g_Calendar;  // global to hold the calendar reference, set by constructor
	
	function calendarTimeout(){
	  if (browser.ie4 || browser.ie5){
	    if (window.event.srcElement && window.event.srcElement.name!='month') timeoutId=setTimeout('g_Calendar.hide();',timeoutDelay);
	  }
	  if (browser.ns6 || browser.ns4){
	    timeoutId=setTimeout('g_Calendar.hide();',timeoutDelay);
	  }
	}
	
	// constructor for calendar class
	function Calendar(){
	  g_Calendar = this;
 
	  // some constants needed throughout the program
	  this.daysOfWeek = new Array("Su","Mo","Tu","We","Th","Fr","Sa");
	  this.months = new Array("January","February","March","April","May","June","July","August","September","October","November","December");
	  this.daysInMonth = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
	  
	  if (browser.ns4){
	    var tmpLayer = new Layer(124);
		if (timeoutDelay){
		  tmpLayer.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);
		  tmpLayer.onmouseover = function(event) { if (timeoutId) clearTimeout(timeoutId); };
		  tmpLayer.onmouseout = function(event) { timeoutId=setTimeout('g_Calendar.hide()',timeoutDelay);};
		}
	    tmpLayer.x = 100;
	    tmpLayer.y = 100;
	    tmpLayer.bgColor = "#ffffff";
	  }
	  if (browser.dom || browser.ie4){
		var tmpLayer = browser.dom?document.getElementById('container'):document.all.container;
	  }
	  this.containerLayer = tmpLayer;
	}
	
 	Calendar.prototype.getFirstDOM = function() {
		var thedate = new Date();
		thedate.setDate(1);
		thedate.setMonth(this.month);
		thedate.setFullYear(this.year);
		return thedate.getDay();
	}

	Calendar.prototype.getDaysInMonth = function (){
	   if (this.month!=1) {
	   return this.daysInMonth[this.month]
	   }
	   else {
	     // is it a leap year
		    if (this.isLeapYear(this.year)) {
			  return 29;
			}
		    else {
			  return 28;
			}
	   }
	}
	 
	Calendar.prototype.isLeapYear = function() {
	  if (this.year%4==0 && ((this.year%100!=0) || (this.year%400==0))) return true; else return false;
	}
	
	Calendar.prototype.buildString = function(){
	  var tmpStr = '<form onSubmit="this.year.blur();return false;"><table width="100%" border="0" cellspacing="0" cellpadding="2" class="calBorderColor"><tr><td valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="1" class="calBgColor">';
	  tmpStr += '<tr>';
	  tmpStr += '<td width="60%" class="cal" align="left">';
	  if (this.hasDropDown) {
	    tmpStr += '<select class="month" name="month" onchange="g_Calendar.selectChange();">';
		for (var i=0;i<this.months.length;i++){
	      tmpStr += '<option value="' + i + '"' 
		  if (i == this.month) tmpStr += ' selected';
		  tmpStr += '>' + this.months[i] + '</option>';
	    }
	    tmpStr += '</select>';
	  } else {
	    tmpStr += '<table border="0" cellspacing="0" cellpadding="0"><tr><td><a href="javascript:g_Calendar.changeMonth(-1);"><img name="calendar" src="images/down.gif" width="8" height="12" border="0" alt=""></a></td><td class="cal" width="100%" align="center">' + this.months[this.month] + '</td><td class="cal"><a href="javascript:g_Calendar.changeMonth(+1);"><img name="calendar" src="images/up.gif" width="8" height="12" border="0" alt=""></a></td></tr></table>';
	  }
	  tmpStr += '</td>';
	  /* observation : for some reason if the below event is changed to 'onChange' rather than 'onBlur' it totally crashes IE (4 and 5)!
	  */
	  tmpStr += '<td width="40%" align="right" class="cal">';
	  
	  if (this.hasDropDown) { 
	    tmpStr += '<select class="year" name="year" onchange="g_Calendar.changeYear(this.options[this.selectedIndex].value);">';
		for (var i=curYear-yearSpan; i<=curYear+yearSpan; i++){
	      tmpStr += '<option value="' + i + '"' 
		  if (i == this.year) tmpStr += ' selected';
		  tmpStr += '>' + i + '</option>';
	    }
	    tmpStr += '</select>';
	  } 
	  else {
	  tmpStr += '<table border="0" cellspacing="0" cellpadding="0"><tr><td><a href="javascript:g_Calendar.changeYear(-1);"><img name="calendar" src="images/down.gif" width="8" height="12" border="0" alt=""></a></td><td class="cal" width="100%" align="center">' + this.year + '</td><td class="cal"><a href="javascript:g_Calendar.changeYear(+1);"><img name="calendar" src="images/up.gif" width="8" height="12" border="0" alt=""></a></td></tr></table>'
	  }
	  tmpStr += '</td>';
	  tmpStr += '</tr>';
	  tmpStr += '</table>';
	  var iCount = 1;
	  var iFirstDOM = this.getFirstDOM(); // to prevent calling it in a loop
	  var iDaysInMonth = this.getDaysInMonth(); // to prevent calling it in a loop
	  
	  tmpStr += '<table width="100%" border="0" cellspacing="0" cellpadding="1" class="calBgColor">';
	  tmpStr += '<tr>';
	    for (var i=0;i<this.daysOfWeek.length;i++){
		  tmpStr += '<td align="center" class="calDaysColor">' + this.daysOfWeek[i] + '</td>';
		}
	  tmpStr += '</tr>';
	  var tmpFrom = parseInt('' + this.dateFromYear + this.dateFromMonth + this.dateFromDay,10);
	  var tmpTo = parseInt('' + this.dateToYear + this.dateToMonth + this.dateToDay,10);
	  var tmpCompare;
	  for (var j=1;j<=6;j++){
	     tmpStr += '<tr>';
	     for (var i=1;i<=7;i++){
		   tmpStr += '<td width="16" align="center" '
		   if ( (7*(j-1) + i)>=iFirstDOM+1  && iCount <= iDaysInMonth){
		     if (iCount==this.day && this.year==this.oYear && this.month==this.oMonth) tmpStr += 'class="calHighlightColor"';
			 else {
			    if (i==1 || i==7) tmpStr += 'class="calWeekend"';
				else tmpStr += 'class="cal"';
			 }
		     tmpStr += '>';
			 /* could create a date object here and compare that but probably more efficient to convert to a number
			   and compare number as numbers are primitives */
			 tmpCompare = parseInt('' + this.year + padZero(this.month) + padZero(iCount),10);
			 if (tmpCompare >= tmpFrom && tmpCompare <= tmpTo) {
			   tmpStr += '<a class="cal" href="javascript:g_Calendar.clickDay(' + iCount + ');">' + iCount + '</a>';
			 } else {
			   tmpStr += '<span class="disabled">' + iCount + '</span>';
			 }
			 iCount++;
		   } else {
		     if  (i==1 || i==7) tmpStr += 'class="calWeekend"';
			 tmpStr += '>&nbsp;';
		   }
		   tmpStr += '</td>'
		 }
		 tmpStr += '</tr>'
	  }
	  tmpStr += '</table></td></tr></table></form>'
	  return tmpStr;
	}
	
	Calendar.prototype.selectChange = function(){
	  this.month = browser.ns6?this.containerLayer.ownerDocument.forms[0].month.selectedIndex:this.containerLayer.document.forms[0].month.selectedIndex;
	  this.writeString(this.buildString());
	}
	
	Calendar.prototype.inputChange = function(){
	  var tmp = browser.ns6?this.containerLayer.ownerDocument.forms[0].year:this.containerLayer.document.forms[0].year;
	  if (tmp.value >=1900 || tmp.value <=2100){
	    this.year = tmp.value;
	    this.writeString(this.buildString());
	  } else {
	    tmp.value = this.year;
	  }
	}
	
	Calendar.prototype.changeYear = function(incr){
	   this.year=incr;
	   this.writeString(this.buildString());
	}
	/*Calendar.prototype.changeYear = function(incr){
	   (incr==1)?this.year++:this.year--;
	   this.writeString(this.buildString());
	}*/
	
	Calendar.prototype.changeMonth = function(incr){
	    if (this.month==11 && incr==1){
	      this.month = 0;
	  	  this.year++;
	    } else {
	      if (this.month==0 && incr==-1){
	        this.month = 11;
		    this.year--;
	      } else {
		    (incr==1)?this.month++:this.month--;
		  }
		}
		this.writeString(this.buildString());
	}
	
	Calendar.prototype.clickDay = function(day){
	   var tmp = eval('document.' + this.target);
	   if (this.dateFormat=='dd-mmm-yyyy') tmp.value = day + this.dateDelim + this.months[this.month].substr(0,3) + this.dateDelim + this.year;
	   if (this.dateFormat=='dd/mm/yyyy') tmp.value = day + this.dateDelim + (this.month+1) + this.dateDelim + this.year;
	   if (this.dateFormat=='mm/dd/yyyy') tmp.value = (this.month+1) + this.dateDelim + day + this.dateDelim + this.year;
	   
	    if (browser.ns4) this.containerLayer.hidden=true;
	    if (browser.dom || browser.ie4){
	      this.containerLayer.style.visibility='hidden'
	    }

		if (tmp.onchange)
	    	tmp.onchange();
	}
	
	Calendar.prototype.writeString = function(str){
	  if (browser.ns4){
	    this.containerLayer.document.open();
	    this.containerLayer.document.write(str);
	    this.containerLayer.document.close();
	  } 
	  if (browser.dom || browser.ie4){
	    this.containerLayer.innerHTML = str;
	  }
	}
	
	Calendar.prototype.show = function(event, target, bHasDropDown, dateFormat, dateFrom, dateTo){
	// calendar can restrict choices between 2 dates, if however no restrictions
	// are made, let them choose any date between 1900 and 3000
	if (dateFrom) this.dateFrom = dateFrom; else this.dateFrom = new Date(1900,0,1);
	this.dateFromDay = padZero(this.dateFrom.getDate());
	this.dateFromMonth = padZero(this.dateFrom.getMonth());
	this.dateFromYear = this.dateFrom.getFullYear();
	if (dateTo) this.dateTo = dateTo; else this.dateTo = new Date(3000,0,1);
	this.dateToDay = padZero(this.dateTo.getDate());
	this.dateToMonth = padZero(this.dateTo.getMonth());
	this.dateToYear = this.dateTo.getFullYear();
	this.hasDropDown = bHasDropDown;
	if (dateFormat) this.dateFormat = dateFormat; else this.dateFormat = 'dd-mmm-yyyy';
	switch (this.dateFormat){
	  case 'dd-mmm-yyyy':
	    this.dateDelim = '-';
		break;
	  case 'dd/mm/yyyy':
	  case 'mm/dd/yyyy':
	    this.dateDelim = '/';
		break;
	}
	
	  if (browser.ns4) {
	    if (!this.containerLayer.hidden) {
		  this.containerLayer.hidden=true;
		  return;
		}
	   }
	  if (browser.dom || browser.ie4){
	    if (this.containerLayer.style.visibility=='visible') {
		  this.containerLayer.style.visibility='hidden';
		  return;
		}  
	  }

	  if (browser.ie5 || browser.ie4){
	    var event = window.event;
	  }
	  if (browser.ns4){
	    this.containerLayer.x = event.x+10;
	    this.containerLayer.y = event.y-5;
	  }
	  if (browser.ie5 || browser.ie4){
	    var obj = event.srcElement;
 	    x = 0;
  		while (obj.offsetParent != null) {
  			if (obj.className.indexOf("center-gray-content") == -1) // Kludge!
  			{
    		  x += obj.offsetLeft;
    		}
    		  obj = obj.offsetParent;
  		}
  		x += obj.offsetLeft;
	    y = 0;
		var obj = event.srcElement;
	    while (obj.offsetParent != null) {
    		  y += obj.offsetTop;
    		  obj = obj.offsetParent;
  		}
  		y += obj.offsetTop;
		
        this.containerLayer.style.left = x+40;
		if (event.y>0)this.containerLayer.style.top = y+120;
	  }
	  if (browser.ns6){
	    this.containerLayer.style.left = event.pageX+10;
		this.containerLayer.style.top = event.pageY-5;
	  }
	  this.target = target;
	  var tmp = eval('document.' + this.target);
	  if (tmp && tmp.value && tmp.value.split(this.dateDelim).length==3){
	    var atmp = tmp.value.split(this.dateDelim)
		this.day = this.oDay = this.dateFormat.substr(0,2)=='dd'?parseInt(atmp[0],0):parseInt(atmp[1],0);
		if (this.dateFormat=='dd-mmm-yyyy'){
		  for (var i=0;i<this.months.length;i++){
		    if (atmp[1].toLowerCase()==this.months[i].substr(0,3).toLowerCase()){
		      this.month = this.oMonth = i;
			  break;
		    }
		  }
		} else {
		  if (this.dateFormat.substr(0,2)=='dd') this.month = this.oMonth = parseInt(atmp[1]-1,0); 
		  else this.month = this.oMonth = parseInt(atmp[0]-1,0);
		}
		this.year= this.oYear = parseInt(atmp[2],10);
	  } else { // no date set, default to today
	    var theDate = new Date();
	  	 this.year = this.oYear = theDate.getFullYear();
	     this.month = this.oMonth = theDate.getMonth();
	     this.day = this.oDay = theDate.getDate();
	  }
	  this.writeString(this.buildString());
	  
	  // and then show it!
	   if (browser.ns4) {
	   this.containerLayer.hidden=false;
	   }
	  if (browser.dom || browser.ie4){
	      this.containerLayer.style.visibility='visible';
	  }
	}
	
	Calendar.prototype.hide = function(){
	  if (browser.ns4) this.containerLayer.hidden = true;
	  if (browser.dom || browser.ie4){
	    this.containerLayer.style.visibility='hidden';
	  }
	}
	
	// events capturing
	window.onload=doCalendar;
	window.document.onclick=handleDocumentClick
	
	function handleDocumentClick(e){
	  if (browser.ie4 || browser.ie5) e = window.event;

	  if (browser.ns6){
	    var bTest = (e.pageX > parseInt(g_Calendar.containerLayer.style.left,10) && e.pageX <  (parseInt(g_Calendar.containerLayer.style.left,10)+125) && e.pageY < (parseInt(g_Calendar.containerLayer.style.top,10)+125) && e.pageY > parseInt(g_Calendar.containerLayer.style.top,10));
	    if (e.target.name!='imgCalendar' && e.target.name!='month'  && e.target.name!='year' && e.target.name!='calendar' && !bTest){
		  g_Calendar.hide(); 
		}
	  }
	  if (browser.ie4 || browser.ie5){
		// extra test to see if user clicked inside the calendar but not on a valid date, we don't want it to disappear in this case
	   var bTest = (e.x > parseInt(g_Calendar.containerLayer.style.left,10) && e.x <  (parseInt(g_Calendar.containerLayer.style.left,10)+125) && e.y < (parseInt(g_Calendar.containerLayer.style.top,10)+125) && e.y > parseInt(g_Calendar.containerLayer.style.top,10));
	    if (e.srcElement.name!='imgCalendar' && e.srcElement.name!='month' && e.srcElement.name!='year' && !bTest & typeof(e.srcElement)!='object'){
		  g_Calendar.hide(); 
		}
	  }
	  if (browser.ns4) g_Calendar.hide();
	}
	function doCalendar(){
	   //var aCalendar = new Calendar(new Date(2001,1,13));
	   var aCalendar = new Calendar(new Date());
	}
	// utility function
	function padZero(num) {
	  return ((num <= 9) ? ("0" + num) : num);
	}
	/** adapted from http://tech.irt.org/articles/js052/index.htm */

	function addDays(startDate,addition) {
	    
		var accumulate    = new Array(0,31, 59, 90,120,151,181,212,243,273,304,334);
		var accumulateLY  = new Array(0,31, 60, 91,121,152,182,213,244,274,305,335);

	    var year = startDate.getFullYear();
		var month = startDate.getMonth();
		var day = startDate.getDate();
		
		if (isLeapYear(year)) var number = day + accumulateLY[month] + addition;
	    else                var number = day + accumulate[month]   + addition;
	    var days = daysinyear(year);
	   
	    while (number > days) {
	        number -= days;
	        days = daysinyear(++year);
	    }
	
	    while (number < 1) {
	        days = daysinyear(--year);
	        number += days;
	    }
	
	    month = 0;
	
	    if (isLeapYear(year)) {
	        while (number > accumulateLY[month]) { month++; }
	        day = number - accumulateLY[--month];
	    }
	    else {
	        while (number > accumulate[month]) { month++; }
	        day = number - accumulate[--month];
	    }
		return new Date(year,month,day);
	}
	
	function daysinyear(year) { if (isLeapYear(year)) return 366; else return 365; }
	function isLeapYear(year) { if (year%4==0 && ((year%100!=0) || (year%400==0))) return true; else return false; }
	/* end of adaptation */