function checkdate(objName)
{
   
	var datefield = objName;
	
		if (chkdate(objName) == false)
		{
			datefield.select();
			alert("Please enter a valid date.");
			datefield.focus();
			return false;
		}
		else
		{
			return true;
	    }
}
function chkdate(objName)
{    
    var temp
	var strDatestyle = "US";
	var strDate;
	var strDateArray;
	var strDay;
	var strMonth;
	var strYear;
	var intday;
	var intMonth;
	var intYear;
	var bFound = false;
	var datefield = objName;
	var strSeparatorArray = new Array("-","/","."," ");
	var intElementNr;
	var err = 0;
	var strMonthArray = new Array(12);
		strMonthArray[0] = "Jan";
		strMonthArray[1] = "Feb";
		strMonthArray[2] = "Mar";
		strMonthArray[3] = "Apr";
		strMonthArray[4] = "May";
		strMonthArray[5] = "Jun";
		strMonthArray[6] = "Jul";
		strMonthArray[7] = "Aug";
		strMonthArray[8] = "Sep";
		strMonthArray[9] = "Oct";
		strMonthArray[10] = "Nov";
		strMonthArray[11] = "Dec";
		strDate = datefield.value;
		if (strDate.length == 0)
		{
		    return true;
		}
		if (strDate.length <= 5 )
		{   
			return  false;
		}
		for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++)
		{       
			if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1)
			{        
				strDateArray = strDate.split(strSeparatorArray[intElementNr]);
				if (strDateArray.length != 3)
				{       
					err = 1;
					return false;
				}
				else
				{
					strDay = strDateArray[0];
					strMonth = strDateArray[1];
					strYear = strDateArray[2];
					intElementNr=strSeparatorArray.length + 1;
				}
				bFound = true;
			}
		}
		if (bFound == false)
		{  
			if (strDate.length>5)
			{
				strDay = strDate.substr(0, 2);
				strMonth = strDate.substr(2, 2);
				strYear = strDate.substr(4);
			}


		}
		
		if (strYear.length == 2)
		{   
		    temp=parseInt(strYear)
		   
		    if (temp<30)
		    {
		    
		    strYear = '20' + strYear;
		    }
		    else
		    {
				if(temp>=30)
				{
				strYear = '19' + strYear;
				}
			}
		}
		
		if (strDatestyle == "US")
		{
			strTemp = strDay;
			strDay = strMonth;
			strMonth = strTemp;
		}
		
		intday = parseInt(strDay, 10);
		
		if (isNaN(intday))
		{      
			err = 2;
			return false;
		}
		
		intMonth = parseInt(strMonth, 10);
		
		if (isNaN(intMonth))
		{
			for (i = 0;i<12;i++)
			{
				if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase())
				{
					intMonth = i+1;
					strMonth = strMonthArray[i];
					i = 12;
        		}
			}
			
		if (isNaN(intMonth))
		{
			err = 3;
			return false;
		}
	}
	
		intYear = parseInt(strYear, 10);
		
		if (isNaN(intYear))
		{        
			err = 4;
			return false;
		}

		if (intMonth>12 || intMonth<1)
		{
			err = 5;
			return false;
		}
		
		if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1))
		{
			err = 6;
			return false;
		}
		
		if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1))
		{
			err = 7;
			return false;
		}
		
		if (intMonth == 2)
		{
			if (intday < 1)
			{
				err = 8;
				return false;
			}
			if (LeapYear(intYear) == true) 
			{
				if (intday > 29)
				{
					err = 9;
					return false;
				}
			}
		else
		{
			if (intday > 28)
			{
				err = 10;
				return false;
			}
		}
		}
		if (strDatestyle == "US")
		{
			datefield.value = intMonth + "/" + intday+"/" + strYear;
		}
		else
		{
			datefield.value = intday + "/" + intMonth + "/" + strYear;
		}
		return true;
		}
		
function LeapYear(intYear)
{
	if (intYear % 100 == 0)
	{
		if (intYear % 400 == 0)
		{
			return true; 
		}
	}
	else
	{
		if ((intYear % 4) == 0)
		{
			return true;
		}
	}
	return false;
}

function inputvalidation()
{
			    
			    chk_dob = document.frmage.dob.value
			    if (chk_dob == "")
			    {
			      alert("DOB cannot be blank")
			      document.frmage.dob.focus() 
			      return false
			    } 
			      if (chkdate(objName) == false)
		            {
					datefield.select();
					alert("Please enter a valid date.");
					datefield.focus();
					return false;
		            }
		         else 
		            {
			       return true;
	                }
}