function checkMail(mail)
{
	var x = mail;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(x)){ 
	
	//alert('Tú email se ha agregado a nuestro newsletter gracias.'); 
	return true;}
	else {alert('El email es Incorrecto');return false;}
}