// JavaScript Document
function checkMail(valor){
		var x = valor
		var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if (filter.test(x)) {
				//correct mail
				return true;
		}	else {
				//incorrect mail
				return false;
		}
}