function checkform ( form )
{

  if ( (form.Email.value == "") || (form.Email.value == "Indirizzo Email") || (form.Name_First.value == "") || (form.Name_First.value == "Nome e Cognome")  ) {
    alert( "Controlla i campi del form di iscrizione." );
    form.Email.focus();
    return false ;
  }

  return true ;
}