function checkrequired(which){
// Variabili associate ai campi del modulo

var email = document.newsletter.email.value; 
var email_reg_exp = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/; 




if (!email_reg_exp.test(email) || (email == "") || (email == "undefined")) {
alert("Indicare il campo Email.");
document.newsletter.email.select();
return false;
}

	


//INVIA MODULO NORMALE
else {
document.newsletter.action = "index.php";
//document.frm_contatti.submit();
}
}




//-->