function isValidMail(mailValue)
	{
		var x = mailValue;
		var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if (filter.test(x)) 
			return (false);
		else 
			return (true);
	}