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;
      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);
  }
}

function CalendarControl() {

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

  var selectedYear = 0;
  var selectedMonth = 0;
  var selectedDay = 0;
  
  var bShowDateSpan = false;
  
  var myStartDate = '';
  var myStartDateYear = 0;
  var myStartDateMonth = 0;
  var myStartDateDay = 0;
  
  var myEndDate = '';
  var myEndDateYear = 0;
  var myEndDateMonth = 0;
  var myEndDateDay = 0;
  
  var dToday = new Date();
  var thisYear = dToday.getFullYear();
  var thisMonth = dToday.getMonth() + 1;
  var thisDay = dToday.getDate();
  //alert(dToday);
  //alert(thisYear + " | " + thisMonth + " | " + thisDay);
  
  
  var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];
  var dateField = 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.clearDate = clearDate;
  function clearDate() {
    dateField.value = '';
    hide();
  }

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

      var dateString = month+"/"+day+"/"+year;
      dateField.value = dateString;
	  
	  if(dateField == document.forms["aspnetForm"].arrival){
		  updateDeparture();
	  }
	  
	  if(dateField == document.forms["aspnetForm"].departure){
		  updateArrival();
	  }
	  
      hide();
    }
    return;
  }

  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 bIsBetween = false;

    var table = "<table cellspacing='0' cellpadding='0' border='0'>";
    table = table + "<tr class='header' valign='top'>";
    table = table + "<td colspan='2' class='previous'><a href='javascript:changeCalendarControlMonth(-1);'>&lsaquo;&nbsp;&nbsp;</a> <!--<a href='javascript:changeCalendarControlYear(-1);'>&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:changeCalendarControlYear(1);'>&raquo;</a>--> <a href='javascript:changeCalendarControlMonth(1);'>&nbsp;&nbsp;&rsaquo;</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 (bShowDateSpan) {
            if ((currentYear == selectedYear && currentMonth == selectedMonth) && ((myStartDateDay <= dayOfMonth) && (dayOfMonth <= myEndDateDay))) {
                bIsBetween = true;
            } else {
                bIsBetween = false;
            }
          }
          if (dayOfMonth == selectedDay && currentYear == selectedYear && currentMonth == selectedMonth) {
            css_class = 'current';
          } else if (dayOfWeek == 0 || dayOfWeek == 6) {
            if (bIsBetween) {
                css_class = 'weekend weekend_between';
            } else {
                css_class = 'weekend';
            }
          } else {
            if (bIsBetween) {
                css_class = 'weekday weekday_between';
            } else {
                css_class = 'weekday';
            }
          }
          if ((currentYear == selectedYear) && (currentMonth == selectedMonth) && (thisDay == dayOfMonth)) {
                css_class = css_class + ' today';
          }
          //alert(bShowDateSpan);
          

          table = table + "<td><a class='"+css_class+"' href=\"javascript:setCalendarControlDate("+currentYear+","+currentMonth+","+dayOfMonth+")\">"+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:clearCalendarControl();'>Clear</a> | <a href='javascript:hideCalendarControl();'>Close</a></td></tr>";
    table = table + "</table>";
    
    return table;
  }

  this.show = show;
  function show(field) {
    can_hide = 0;
  
    // If the calendar is visible and associated with
    // this field do not do anything.
    dateField = document.getElementById(field);
    //if (dateField.id == field) { return; } else { eval('dateField = document.forms["aspnetForm"].'+field+';'); }

    if (document.getElementById('arrival') && document.getElementById('departure')) {
        bShowDateSpan = true;
        myStartDate = document.getElementById('arrival').value;
        myEndDate = document.getElementById('departure').value;
        //alert(myStartDate + "|" + myEndDate);
        try {
            var myDateString = new String(myStartDate);
            var myDateParts = myDateString.split("/");
            myStartDateMonth = parseInt(myDateParts[0],10);
            myStartDateDay = parseInt(myDateParts[1],10);
            myStartDateYear = parseInt(myDateParts[2],10);
            myDateString = new String(myEndDate);
            myDateParts = myDateString.split("/");
            myEndDateMonth = parseInt(myDateParts[0],10);
            myEndDateDay = parseInt(myDateParts[1],10);
            myEndDateYear = parseInt(myDateParts[2],10);
        } catch(e) {}
        //alert(myStartDate + " | " + myStartDateMonth + " | " + myStartDateDay + " | " + myStartDateYear + " | " + myEndDate + " | " + myEndDateMonth + " | " + myEndDateDay + " | " + myEndDateYear);
    }

    if(dateField) {
      try {
        var dateString = new String(dateField.value);
        //alert(dateString);
        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);

      setProperty('display', 'block');

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

      var x = fieldPos.getElementLeft();
      var y = fieldPos.getElementBottom();

      setProperty('left', x + "px");
      setProperty('top', y + "px");
 
      if (document.all) {
        setElementProperty('display', 'block', 'CalendarControlIFrame');
        setElementProperty('left', x + "px", 'CalendarControlIFrame');
        setElementProperty('top', y + "px", 'CalendarControlIFrame');
        setElementProperty('width', calendarPos.getElementWidth() + "px", 'CalendarControlIFrame');
        setElementProperty('height', calendarPos.getElementHeight() + "px", 'CalendarControlIFrame');
      }
    }
  }

  this.hide = hide;
  function hide() {
    if(dateField) {
      setProperty('display', 'none');
      setElementProperty('display', 'none', 'CalendarControlIFrame');
      dateField = null;
    }
  }

  this.visible = visible;
  function visible() {
    return dateField
  }

  this.can_hide = can_hide;
  var can_hide = 0;
}

var calendarControl = new CalendarControl();

function showCalendarControl(textField) {
  // textField.onblur = hideCalendarControl;
  
  calendarControl.show(document.getElementById(textField).id);
  
}

function clearCalendarControl() {
  calendarControl.clearDate();
}

function hideCalendarControl() {
  if (calendarControl.visible()) {
    calendarControl.hide();
  }
}

function setCalendarControlDate(year, month, day) {
  calendarControl.setDate(year, month, day);
  //Added the Date Diff
  dateDiff();
}
 
function changeCalendarControlYear(change) {
  calendarControl.changeYear(change);
}

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

var d = new Date();
var d2 = new Date();
var dNow = new Date();
dNow.setHours(0,0,0,0);
d2.setDate(d2.getDate() + 1);
yearstring = d2.getYear().toString();
yearstring =yearstring.substring(yearstring.length-2, yearstring.length);
yearstring2 = d.getYear().toString();
yearstring2 =yearstring2.substring(yearstring2.length-2, yearstring2.length);
yearstring3 = dNow.getYear().toString();
yearstring3 =yearstring3.substring(yearstring3.length-2, yearstring3.length);

function setInitialDateValues() {         
    if (document.forms["aspnetForm"].arrival && document.forms["aspnetForm"].departure) {
       document.forms["aspnetForm"].arrival.value = (d.getMonth()+1) + "/" + d.getDate() + "/20" + yearstring;
        document.forms["aspnetForm"].departure.value =  (d2.getMonth()+1) + "/" + d2.getDate() + "/20" + yearstring2;
    }		
}
function updateDeparture(){
    var d3 = new Date(document.forms["aspnetForm"].arrival.value);
    var d4 = new Date(document.forms["aspnetForm"].departure.value);
    if (d4 <= d3) {
        d3.setDate(d3.getDate() +1);
        d2 = d3;
        yearstring2 = d3.getYear().toString();
        yearstring2 =yearstring2.substring(yearstring2.length-2, yearstring2.length);
        document.forms["aspnetForm"].departure.value = (d3.getMonth()+1) + "/" + d3.getDate() + "/20" + yearstring2;
    } 
    
}

function updateArrival(){
    var d3 = new Date(document.forms["aspnetForm"].arrival.value);
    var d4 = new Date(document.forms["aspnetForm"].departure.value);
    if (d4 <= d3) {
        d3.setDate(d4.getDate() -1);
        d2 = d3;
        yearstring2 = d3.getYear().toString();
        yearstring2 =yearstring2.substring(yearstring2.length-2, yearstring2.length);
        document.forms["aspnetForm"].arrival.value = (d3.getMonth()+1) + "/" + d3.getDate() + "/20" + yearstring2;
    }
     
}

function resetArrival() {
    d1 = dNow;
    document.forms["aspnetForm"].arrival.value = (dNow.getMonth()+1) + "/" + dNow.getDate() + "/20" + yearstring3;
}


//Aparna Gollapudi dateDiff 

function dateDiff()
{
    if (document.getElementById("ctl00_MainPlaceHolder_checkInDate"))
    {
        var chkInDt = document.getElementById("ctl00_MainPlaceHolder_checkInDate").value;
        var chkOutDt = document.getElementById("ctl00_MainPlaceHolder_checkOutDate").value;
        var one_day=1000*60*60*24;
        var totalNoNights = 0;
        if ((chkInDt.length >0) && (chkOutDt.length >0))
        {
            if ((isDate(chkInDt)==true) && (isDate(chkOutDt)==true))
	        {
	            totalNoNights = (new Date(chkOutDt).getTime() - new Date(chkInDt).getTime())/one_day;
	            if (totalNoNights>0)
	                document.getElementById("ctl00_MainPlaceHolder_totalNights").value = totalNoNights;
                else
                	document.getElementById("ctl00_MainPlaceHolder_totalNights").value = "invalid dates";
	        }
        }
    }
    //alert(textBox.value);
}

var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
//		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
//		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
//		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
//		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
//		alert("Please enter a valid date")
		return false
	}
return true
}