codice:
  <html>

    <head>
      <script type="text/javascript" language="JavaScript">
      <!--

        function checkEmail( __hForm )
        {
          var _eMail     = __hForm.elements["email"].value;
          var _validMail = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/;

          if ( _eMail == "" ) {
            alert( "Compilare il capo e-mail prima di procedere!" );
            return false;
          }

          else if ( !_validMail.test( _eMail ) )
          {
            alert( "Inserire un indirizzo e-mail valido!" );
            return false;
          }

          return true;
        }

      //-->
      </script>
    </head>

    <body>

      <form onsubmit="return checkEmail( this );" action="/site/mailing.asp" method="post">
        <font color="white" size="1">Iscriviti alla Mailing-List</font>


	<input type="text" name="email" size="22" value="Inserisci la tua e-mail" />

	<input type="submit" value="Iscriviti" name="cmd" />
	<input type="submit" value="Cancellati" name="cmd" />
      </form>

    </body>

  </html>