function checkMail()
{
	var x = document.form.email_validation.value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(x)){
	 document.form.submit();
	}
	else {
			 alert('Incorrect email address');
			}
}