function checkMail(email_value)
{	var x = email_value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(x))
		return true;
		// alert('YES! Correct email address');
	else 
		return false;
		//alert('NO! Incorrect email address');
		}