<!--
function checkEmailAddress(field) {
// note: next expression must be all on one line...
var goodEmail = field.value.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\..{2,2}))$)\b/gi);

if (goodEmail){
   return true
} else {
   alert('Indirizzo e-mail errato!')
   field.focus()
   field.select()
   return false
   }
}
//-->