 <!--
  function control() {
     var nome = document.modulo.nome.value;
     var email = document.modulo.email.value;
     var email_reg_exp = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/;

        if ((nome == "") || (nome == "undefined")) {
           alert("name field is required.");
           document.modulo.nome.focus();
           return false;
        }
        else if (!email_reg_exp.test(email) || (email == "") || (email == "undefined")) {
           alert("insert a correct email.");
           document.modulo.email.select();
           return false;
        }
        else {
           document.modulo.action = "mail_eng.asp";
           document.modulo.submit();
        }
  }
 //-->