function controlla() { 
 
  if (document.mailing.email.value == "")
		 {
		 	alert("inserire l'indirizzo E-mail")
			document.mailing.email.focus();
			return false
		 }
 
 	var good;
	var goodEmail = document.mailing.email.value.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.it)|(\.edu)|(\.mil)|(\.gov)|(\.org)(\..{2,2}))$)\b/gi);
 
	if (goodEmail){
   		good = true
	} else {
		alert ("Inserire un indirizzo email valido") ; document.mailing.email.focus(); return false
   	field.focus()
   	field.select()
   	good = false
   	}

 }