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(strDay)
	day=parseInt(strMonth)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		return false
	}
	if (strDay.length<1 || month<1 || month>12){
		return false
	}
	if (strMonth.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		return false
	}
return true
}

function validateDocumentControls()
   {
        var startDate = document.getElementById(txtStartDateID).value.replace(/^\s*|\s*$/g,'');
        var endDate = document.getElementById(txtEndDateID).value.replace(/^\s*|\s*$/g,'');
        var topic = document.getElementById(ddlImageGalleryID);
         
        if(startDate =='' && endDate =='' && topic.options.selectedIndex <"1")
        {
            alert('Please enter search criteria');
            return false;
        }
          if(startDate !='' && isDate(startDate) == false)
          {
            alert("Please enter valid start date in format(dd/mm/yyyy)"); 
            document.getElementById(txtStartDateID).focus();
            document.getElementById(txtStartDateID).value='';
            return false;  
          }
          if(endDate !='' && isDate(endDate) ==false )
          {
            alert("Please enter valid end date in format(dd/mm/yyyy)"); 
            document.getElementById(txtEndDateID).focus();
              document.getElementById(txtEndDateID).value='';
            return false;  
          }
          if(startDate !='' && endDate !='')
          {
           var startDate=getDate(startDate);
	         var endDate=getDate(endDate);
             var actualStartDate = new Date(startDate); 
              var actualEndDate = new Date(endDate); 
             
              if(actualStartDate > actualEndDate) 
              { 
                alert("Start date should be less than end date"); 
                document.getElementById(txtStartDateID).value='';
                 document.getElementById(txtEndDateID).value='';
                 document.getElementById(txtStartDateID).focus();
                return false;  
              } 
        }
   }
   
    function LeftvalidateControls()
   {
  
   var Keywords = document.getElementById(txtKeywords).value.replace(/^\s*|\s*$/g,''); 
   var startDate = document.getElementById(txtPolicyStartDate).value.replace(/^\s*|\s*$/g,'');
   var endDate = document.getElementById(txtPolicyEndDate).value.replace(/^\s*|\s*$/g,'');
    var topic = document.getElementById(ddlTopic.ClientID);
        var content = document.getElementById(ddlContentType);
                

   if(startDate !='' && isDate(startDate) == false)
          {
            alert("Please enter valid start date in format(dd/mm/yyyy)"); 
            document.getElementById(txtPolicyStartDate).focus();
            document.getElementById(txtPolicyStartDate).value='';
            return false;  
          }
          if(endDate !='' && isDate(endDate) ==false )
          {
            alert("Please enter valid end date in format(dd/mm/yyyy)"); 
            document.getElementById(txtPolicyEndDate).focus();
              document.getElementById(txtPolicyEndDate).value='';
            return false;  
          }
          if(startDate !='' && endDate !='')
          {
            
	         var startDate=getDate(startDate);
	         var endDate=getDate(endDate);
             var actualStartDate = new Date(startDate); 
             
              var actualEndDate = new Date(endDate); 
             
              if(actualStartDate > actualEndDate) 
              { 
            
                alert("Start date should be less than end date"); 
                document.getElementById(txtPolicyStartDate).value='';
                 document.getElementById(txtPolicyEndDate).value='';
                 document.getElementById(txtPolicyStartDate).focus();
                return false;  
              } 
               
        }
   }
  function getDate(date)
   {
   	        var pos1=date.indexOf(dtCh)
             var pos2=date.indexOf(dtCh,pos1+1);
             var Day=date.substring(0,pos1);
	         var Month=date.substring(pos1+1,pos2);
	         var Year=date.substring(pos2+1);
	         var date=Month+"/"+Day+"/"+Year;
            
             return date;
   }