function positionInfo(object) {

  var p_elm = object;

  this.getElementLeft = getElementLeft;
  function getElementLeft() {
    var x = 0;
    var elm;
    if(typeof(p_elm) == "object"){
      elm = p_elm;
    } else {
      elm = document.getElementById(p_elm);
    }
    while (elm != null) {
      x+= elm.offsetLeft;
      elm = elm.offsetParent;
    }
    return parseInt(x);
  }

  this.getElementWidth = getElementWidth;
  function getElementWidth(){
    var elm;
    if(typeof(p_elm) == "object"){
      elm = p_elm;
    } else {
      elm = document.getElementById(p_elm);
    }
    return parseInt(elm.offsetWidth);
  }

  this.getElementRight = getElementRight;
  function getElementRight(){
    return getElementLeft(p_elm) + getElementWidth(p_elm);
  }

  this.getElementTop = getElementTop;
  function getElementTop() {
    var y = 0;
    var elm;
    if(typeof(p_elm) == "object"){
      elm = p_elm;
    } else {
      elm = document.getElementById(p_elm);
    }
    while (elm != null) {
      y+= elm.offsetTop;
      if(elm.offsetParent!=null)
	      y-= elm.scrollTop;
      elm = elm.offsetParent;
    }
    return parseInt(y);
  }

  this.getElementHeight = getElementHeight;
  function getElementHeight(){
    var elm;
    if(typeof(p_elm) == "object"){
      elm = p_elm;
    } else {
      elm = document.getElementById(p_elm);
    }
    return parseInt(elm.offsetHeight);
  }

  this.getElementBottom = getElementBottom;
  function getElementBottom(){
    return getElementTop(p_elm) + getElementHeight(p_elm);
  }
}

var endDateField = null;

function CalendarControl() {

  var calendarId = 'CalendarControl';
  var currentYear = 0;
  var currentMonth = 0;
  var currentDay = 0;

  var selectedYear = 0;
  var selectedMonth = 0;
  var selectedDay = 0;

  var startYear = 0;
  var startMonth = 0;
  var startDay = 0;
  
  var endYear = 9999;
  var endMonth = 0;
  var endDay = 0;

  var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];
  var dateField = null;
  var posField = null;
  var startDateField = null;
  
  var defaultDateMonthPattern = 'MM/dd/yyyy';
  var dateMonthPattern = defaultDateMonthPattern;

  this.onHide = null;

  function getProperty(p_property){
    var p_elm = calendarId;
    var elm = null;

    if(typeof(p_elm) == "object"){
      elm = p_elm;
    } else {
      elm = document.getElementById(p_elm);
    }
    if (elm != null){
      if(elm.style){
        elm = elm.style;
        if(elm[p_property]){
          return elm[p_property];
        } else {
          return null;
        }
      } else {
        return null;
      }
    }
  }

  function setElementProperty(p_property, p_value, p_elmId){
    var p_elm = p_elmId;
    var elm = null;

    if(typeof(p_elm) == "object"){
      elm = p_elm;
    } else {
      elm = document.getElementById(p_elm);
    }
    if((elm != null) && (elm.style != null)){
      elm = elm.style;
      elm[ p_property ] = p_value;
    }
  }

  function setProperty(p_property, p_value) {
    setElementProperty(p_property, p_value, calendarId);
  }

  function getDaysInMonth(year, month) {
    return [31,((!(year % 4 ) && ( (year % 100 ) || !( year % 400 ) ))?29:28),31,30,31,30,31,31,30,31,30,31][month-1];
  }

  function getDayOfWeek(year, month, day) {
    var date = new Date(year,month-1,day)
    return date.getDay();
  }

  this.setDate = setDate;
  function setDate(year, month, day) {
    if (dateField) {
      if (month < 10) {month = "0" + month;}
      if (day < 10) {day = "0" + day;}

      var dateString = getDateFormatted(year, month, day);
      dateField.value = dateString;
      if (this.onSelect) {
    	  this.onSelect(dateString);
      } else {
    	  this.hide();
      }
    }
    return;
  }
  
  this.onSelect = null;
  this.setOnSelect = function(onSelect) {
	  this.onSelect = onSelect;
  }
  
  function getDateFormatted(year, month, day) {	
      var dateString = "";												
      																
      var patterns = dateMonthPattern.split("/");						
      if (patterns.length != 3) {
      	return "";
      }
  	
  	  for (i=0; i<patterns.length; i++) {	  	  
	  	  switch(patterns[i].toLowerCase()) {
			  case "mm":                      
			  	dateString += month;
			  break; 
			  case "dd":                      
			  	dateString += day;
			  break; 
			  case "yy":                      
			  	dateString +=("" + year).substring(2);
			  break; 
			  case "yyyy":                      
			  	dateString += year;
			  break; 
			  default:
			  	return "";
		  }
		  
		  dateString += "/"; 	  									
	  }								
  	  dateString = dateString.substring(0, dateString.lastIndexOf("/"));									
  		
	  return dateString;
  }

  this.changeMonth = changeMonth;
  function changeMonth(change) {
    currentMonth += change;
    currentDay = 0;
    if(currentMonth > 12) {
      currentMonth = 1;
      currentYear++;
    } else if(currentMonth < 1) {
      currentMonth = 12;
      currentYear--;
    }

    calendar = document.getElementById(calendarId);
    calendar.innerHTML = calendarDrawTable();
  }

  this.changeYear = changeYear;
  function changeYear(change) {
    currentYear += change;
    currentDay = 0;
    calendar = document.getElementById(calendarId);
    calendar.innerHTML = calendarDrawTable();
  }

  function getCurrentYear() {
    var year = new Date().getYear();
    if(year < 1900) year += 1900;
    return year;
  }

  function getCurrentMonth() {
    return new Date().getMonth() + 1;
  } 

  function getCurrentDay() {
    return new Date().getDate();
  }

  function calendarDrawTable() {

    var dayOfMonth = 1;
    var validDay = 0;
    var startDayOfWeek = getDayOfWeek(currentYear, currentMonth, dayOfMonth);
    var daysInMonth = getDaysInMonth(currentYear, currentMonth);
    var css_class = null; //CSS class for each day

    var table = "<table cellspacing='0' cellpadding='0' border='0'>";
    table = table + "<tr class='header'>";
    table = table + "  <td colspan='2' class='previous'><a href=\"javascript:return;\" onclick=\"changeCalendarControlMonth(-1); return false;\">&lt;</a> <a href=\"javascript:return;\" onclick=\"changeCalendarControlYear(-1); return false;\">&laquo;</a></td>";
    table = table + "  <td colspan='3' class='title'>" + months[currentMonth-1] + "<br>" + currentYear + "</td>";
    table = table + "  <td colspan='2' class='next'><a href=\"javascript:return;\" onclick=\"javascript:changeCalendarControlYear(1); return false;\">&raquo;</a> <a href=\"javascript:return;\" onclick=\"javascript:changeCalendarControlMonth(1); return false;\">&gt;</a></td>";
    table = table + "</tr>";
    table = table + "<tr><th>S</th><th>M</th><th>T</th><th>W</th><th>T</th><th>F</th><th>S</th></tr>";

    for(var week=0; week < 6; week++) {
      table = table + "<tr>";
      for(var dayOfWeek=0; dayOfWeek < 7; dayOfWeek++) {
        if(week == 0 && startDayOfWeek == dayOfWeek) {
          validDay = 1;
        } else if (validDay == 1 && dayOfMonth > daysInMonth) {
          validDay = 0;
        }

        if(validDay) {
          if (dayOfMonth == selectedDay && currentYear == selectedYear && currentMonth == selectedMonth) {
            css_class = 'current';
          } else if (dayOfWeek == 0 || dayOfWeek == 6) {
            css_class = 'weekend';
          } else {
            css_class = 'weekday';
          }
          
          var dayIsBeforeStartDate = currentYear < startYear || 
		  	(currentYear == startYear && currentMonth < startMonth) ||
		  	(currentYear == startYear && currentMonth == startMonth && dayOfMonth < startDay);
          
          var dayIsAfterEndDate = currentYear > endYear || 
		  	(currentYear == endYear && currentMonth > endMonth) ||
		  	(currentYear == endYear && currentMonth == endMonth && dayOfMonth > endDay);;
          
		  if (dayIsBeforeStartDate || dayIsAfterEndDate) {
		  	//not a link, date is not active because issue shouldn't have ageing < 0
	          table = table + "<td class='empty'>"+dayOfMonth+"</td>";
		  }	else {
	          table = table + "<td><a class='"+css_class+"' href=\"javascript:return;\" onclick=\"javascript:setCalendarControlDate("+currentYear+","+currentMonth+","+dayOfMonth+"); return false;\">"+dayOfMonth+"</a></td>";
		  }
          dayOfMonth++;
        } else {
          table = table + "<td class='empty'>&nbsp;</td>";
        }
      }
      table = table + "</tr>";
    }

    table = table + "<tr class='header'><th colspan='7' style='padding: 3px;'><a href='javascript:return;' onclick='javascript:hideCalendarControl(); return false;'>Close</a></td></tr>";
    table = table + "</table>";

    return table;
  }

  //this.show = show;
  this.show1 = show1;
  this.show2 = show2;
  this.show3 = show3;

  function show1(field) {
  	 // If the calendar is visible and associated with
    // this field do not do anything.
  	if (dateField == field) {
      return;
    } else {
      dateField = field;
      posField = field;
    }
    show();
  }
  
  function show2(field1, field2) {
  	if (dateField == field1) {
      return;
    } else {
      dateField = field1;
      posField = field2;
    }
    show();
  }

 function show3(field1, field2, field3) {
  	if (dateField == field1) {
      return;
    } else {
      dateField = field1;
      posField = field2;
      startDateField = field3;
    }
    show();
  }
  
  function show() {
  	startMonth = 0;
    startDay = 0;
    startYear = 0;
    
    endYear = 9999;
    endMonth = 0;
    endDay = 0;
    
    if(startDateField) {
      try {
        var dateString = new String(startDateField);
        var dateParts = dateString.split("/");
        
        startMonth = parseInt(dateParts[0],10);
        startDay = parseInt(dateParts[1],10);
        startYear = parseInt(dateParts[2],10);
      } catch(e) {}
    }
    
    if(endDateField) {
        try {
          var endDateString = new String(endDateField);
          var endDateParts = endDateString.split("/");
          
          endMonth = parseInt(endDateParts[0],10);
          endDay = parseInt(endDateParts[1],10);
          endYear = parseInt(endDateParts[2],10);
        } catch(e) {}
      }
    
    if(dateField) {
      try {
        var dateString = new String(dateField.value);
        var dateParts = dateString.split("-");
        
        selectedMonth = parseInt(dateParts[0],10);
        selectedDay = parseInt(dateParts[1],10);
        selectedYear = parseInt(dateParts[2],10);
      } catch(e) {}
    }

    if (!(selectedYear && selectedMonth && selectedDay)) {
      selectedMonth = getCurrentMonth();
      selectedDay = getCurrentDay();
      selectedYear = getCurrentYear();
    }

    currentMonth = selectedMonth;
    currentDay = selectedDay;
    currentYear = selectedYear;

    if(document.getElementById){

      calendar = document.getElementById(calendarId);
      calendar.innerHTML = calendarDrawTable(currentYear, currentMonth);

      var fieldPos = new positionInfo(posField);
      var calendarPos = new positionInfo(calendarId);

      var x = fieldPos.getElementLeft();
      var y = fieldPos.getElementBottom();
      	var wH = document.documentElement.clientHeight;
		var wW = document.documentElement.clientWidth;
		
		var sL = document.documentElement.scrollLeft;
		var sT = document.documentElement.scrollTop;
		var x1 = fieldPos.getElementLeft();
		var x2 = fieldPos.getElementRight();
	    var y1 = fieldPos.getElementTop();

	    var wszCal = 205;
	    var hszCal = 200;
	    	
		//Y
		if(((wH-y1) < hszCal) && ((y1-hszCal)>0)){
		    setProperty('top', y1-hszCal+"px");		
		    setElementProperty('top', y1-hszCal+"px", 'CalendarControlIFrame');
		}
		if(((wH-y1) < hszCal) && ((y1-hszCal)<0)){		
			setProperty('top', y + "px");
	      	setElementProperty('top', y + "px", 'CalendarControlIFrame');						
		}
		if((wH-y) > hszCal) {				
	      	setProperty('top', y + "px");		
	      	setElementProperty('top', y + "px", 'CalendarControlIFrame');				
		} if(((y1-sT) < hszCal) ){
   			setProperty('top', y +  "px");		
		    setElementProperty('top', y + "px", 'CalendarControlIFrame');
		}
		//X
		if(((sL + wW - x2) < wszCal) && ((x2 - sL) > wszCal)){
		  	setProperty('left', wW + sL - wszCal + "px");
	      	setElementProperty('left', wW + sL - wszCal  + "px", 'CalendarControlIFrame');						
		}
		if(((x2 - sL) < wszCal) && ((sL + wW - x2) > wszCal)){
		  	setProperty('left', sL  + "px");
	      	setElementProperty('left', sL  + "px", 'CalendarControlIFrame');
		}
		if((x2 - sL) > wszCal && (sL + wW - x2) > wszCal){
		  	setProperty('left', x1 + "px");
	      	setElementProperty('left', x1 + "px", 'CalendarControlIFrame');
		}
		if((x2 - sL) < wszCal && (sL + wW - x2) < wszCal){
		  	setProperty('left', sL + wW/2 - wszCal/2  + "px");
	      	setElementProperty('left', sL + wW/2 - wszCal/2 + "px", 'CalendarControlIFrame');
		}
	
      setElementProperty('width', calendarPos.getElementWidth() + "px", 'CalendarControlIFrame');
      setElementProperty('height', calendarPos.getElementHeight() + "px", 'CalendarControlIFrame');
      setElementProperty('display', 'block', 'CalendarControlIFrame');
      setProperty('display', 'block');
    }
  }

  this.hide = hide;
  function hide() {
    if(dateField) {
      setProperty('display', 'none');
      setElementProperty('display', 'none', 'CalendarControlIFrame');
      dateField = null;
      if (this.onHide!=null) {
      	this.onHide();
      	this.onHide=null;
      }
    }
  }
  
  this.setPattern = setPattern;
  function setPattern(pattern) {			
	if (pattern) {
	  dateMonthPattern = pattern;      	
	  return;
	}
	dateMonthPattern = defaultDateMonthPattern;      
  }
}

var calendarControl = new CalendarControl();

function showCalendarControl(textField, positionField, dateField, pattern, options) {  
  calendarControl.setPattern(pattern);
  
  if (options != null) {
	  if (options.endDate != null) {
		  endDateField = options.endDate;
	  }
  }
  
  if (positionField) {
  	  if (dateField) {
		  calendarControl.show3(textField, positionField, dateField);
  	  }	else {
		  calendarControl.show2(textField, positionField);
	  }
	  return calendarControl;
  } else
  	  calendarControl.show1(textField);
  
  return calendarControl;
  
}

function hideCalendarControl() {
  calendarControl.onHide = null;
  calendarControl.hide();
}

function setCalendarControlDate(year, month, day) {
  calendarControl.setDate(year, month, day);
}

function changeCalendarControlYear(change) {
  calendarControl.changeYear(change);
}

function changeCalendarControlMonth(change) {
  calendarControl.changeMonth(change);
}

document.write("<iframe id='CalendarControlIFrame' src='javascript:false;' frameBorder='0' scrolling='no'></iframe>");
document.write("<div id='CalendarControl'></div>");



 function parseValidDate(object) {
    return parseValidDate(object, getCurrentDateStr())
}

  function parseValidDate(object, defaultDateStr) {
      var str = new String(object.value);
      if (str == '') {
      	return true;
      }
		var time = Date.parse(object.value);
	    if("NaN" == time +"") {
			alert("Incorrect date.");
			object.value = defaultDateStr;
			return false;
		} else {
		  var enteredDate = new Date(time);
		  var day = enteredDate.getDate();  
		  var month = enteredDate.getMonth()+1; 
		  var year = enteredDate.getFullYear(); 
		  var checkDateStr = month+"/" + day+ "/" + year;
		  var checkTime = new Date(checkDateStr).getTime();
		 var elements = str.split("/");
		  if(    elements.length < 3 ||
				elements[2] != year ||
				(elements[0] != month && elements[0] != leftPadC(month+"", 2,'0')) ||
				(elements[1] != day && elements[1] != leftPadC(day+"", 2,'0'))
    		) 
		{
			alert("Incorrect date.");
			object.value = defaultDateStr;
			object.focus();
			return false;
		  } else if(year < 2000) {
			alert("Year must be >= 2000.");
			object.value = defaultDateStr;
			object.focus();
			return false;
		  } else {
			//alert("GOOD, year is correct!!")
	      }

       }        
   
   }
   
   
   
   

	function leftPadC(str, len,ch)
	{

		var slen;
		slen=len-str.length;
	        var buf = "";
		while ( buf.length < slen ) {
		      buf += ch;
		}
		buf += str;
		buf;
		return buf;
	}


	function getCurrentDateStr() {
		var currDate = new Date();
		return leftPadC(currDate.getMonth()+1+"", 2,'0') + "/" + leftPadC(currDate.getDate()+"", 2,'0') + "/" + currDate.getFullYear();
	}