allora prova così:

codice:
function submitIt(theform) { 
if (theform.Nome.value == "") { 
alert("Obbligatorio"); 
theform.Nome.focus(); 
return false; 
} 
if (theform.Cognome.value == "") { 
alert("Obbligatorio"); 
theform.Cognome.focus(); 
return false; 
}
re = new RegExp("^[!#$&'*+/-9=?A-Z^-~-]+(\\.[!#$&'*+/-9=?A-Z^-~-]+)*@[!#$&'*+/-9=?A-Z^-~-]+(\\.[!#$&'*+/-9=?A-Z^-~-]+)+$", "i");   
if (!theform.Email.value.match(re))    
{ 
alert("Obbligatorio");      
theform.Email.focus();      
theform.Email.select();      
return(false); 
}
popup();
return controllo();
}