function checkdate(objName)
{
	var datefield = objName;
	
	if (chkdate(objName) == false)
	{
		return false;
	}
	else
	{
		return true;
	}
}

function chkdate(objName)
{
	//var strDatestyle = "US"; //United States date style
	var strDatestyle = "EU";  //European date style
	var strDate;
	var strDateArray;
	var strDay;
	var strMonth;
	var strYear;
	var intday;
	var intMonth;
	var intYear;
	var booFound = false;
	var datefield = objName;
	var strSeparatorArray = new Array("-"," ","/",".");
	var intElementNr;
	var err = 0;
	var strMonthArray = new Array(12);
	strMonthArray[0] = "01";
	strMonthArray[1] = "02";
	strMonthArray[2] = "03";
	strMonthArray[3] = "04";
	strMonthArray[4] = "05";
	strMonthArray[5] = "06";
	strMonthArray[6] = "07";
	strMonthArray[7] = "08";
	strMonthArray[8] = "09";
	strMonthArray[9] = "10";
	strMonthArray[10] = "11";
	strMonthArray[11] = "12";
	strDate = datefield;

	if (strDate.length < 1) 
	{
		return true;
	}
	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];
			}
			booFound = true;
		}
	}
	if (booFound == false) 
	{
		if (strDate.length>5) 
		{	
			strDay = strDate.substr(0, 2);
			strMonth = strDate.substr(2, 2);
			strYear = strDate.substr(4);
		}
	}
	if (strYear.length == 2) 
	{
		strYear = '20' + strYear;
	}


// US style
	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") 
{
	no_day=intday.toString();
	if(no_day.length==1)
	{
		no_day='0'+no_day ; 
	}
	datefield.value =  strYear + "-" + strMonthArray[intMonth-1] + "-" +  no_day;
}
else 
{
datefield.value = intday + " " + strMonthArray[intMonth-1] + " " + 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;
}