function isNumberKey(evt){
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode < 48 || charCode > 57))
	return false;
	
	return true;
}

function isAlphaNumeric(evt){
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode < 31 || (charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123) || (charCode > 47 && charCode < 58)){
		return true;
	} else {
		return false;
	}
}