var noOfchars = 0;

function isNumberKey(evt) {
	var charCode = (evt.which) ? evt.which : event.keyCode;

	if(noOfchars == 0 && charCode == 48)
	{
		noOfchars = 0;
		return false;
	}
	noOfchars++;
	if (charCode > 31 && (charCode < 48 || charCode > 57)) {
		return false;
	}
	return true;
}

function isCharKey(evt) {
	var charCode = (evt.which) ? evt.which : event.keyCode;

	if(noOfchars == 0 && charCode == 48)
	{
		noOfchars = 0;
		return true;
	}
	noOfchars++;
	if (charCode > 31 && (charCode < 48 || charCode > 57)) {
		return true;
	}
	return false;
}

	function CurrentYear(year)
	{
		if(year.value > new Date().getYear())
		{
			alert("Year Should be Less than present year");
			year.value="";
			return false;
		}
		else
		{
			return true;
		}
	}