Scusate l'ignoranza, ma dove sbaglio??
Non mi funziona il controllo JAVASCRIPT!

tonystm.altervista.org

Codice PHP:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<
html>
<
head>
<
title>Segnala la pagina ad un tuo Amico</title>
<
link rel="stylesheet" href="css/layout.css" type="text/css">
<
script language="JavaScript">
   <!--
    function 
Invio() {
       var 
nome document.Email.mittente.value;
       var 
email document.Email.emailmitt.value;
       var 
nomea document.Email.destinatario.value;
       var 
emaila document.Email.emaildest.value;
          if (
nome == "") {
             
alert("Inserisci il tuo nome per favore.");
             
document.Email.nome.focus();
          }
          else if ((
email == "") || (email.indexOf("@") == (-1))) {
             
alert("Controlla il tuo indirizzo email per favore.");
             
document.Email.email.value "";
             
document.Email.email.focus();
          }
          else if (
nomea == "") {
             
alert("Inserisci il nome del tuo amico per favore.");
             
document.Email.nomea.focus();
          }
          else if ((
emaila == "") || (emaila.indexOf("@") == (-1))) {
             
alert("Controlla l'indirizzo email del tuo amico per favore.");
             
document.Email.emaila.value "";
             
document.Email.emaila.focus();
          }
          else {
             
document.Email.action "invio.php";
             
document.Email.submit();
          }
    }
    function 
Cancella() {
       
annulla window.confirm("Cancellare i dati immessi nel modulo?");
       
document.Email.nome.focus();
       return 
annulla;
    }
   
//-->
</script>
</head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td align="center" bgcolor="#006699"><font color="#FFFFFF">[b]Segnala questa pagina ad un amico[/b]

    <code>* Campi obbligatori</code></font>
    </td>
  </tr>
</table>


<table width="100%" cellspacing="1" cellpadding="2" border="0" align="center" bgcolor="#ffffff">
    <form action="invio.php" onReset="return Cancella()" method="POST">
      <tr>
                <td align="right">
                        <code>Il tuo nome: *</code>
                </td>
                <td width="60%">
                        <input name="mittente" class="boxgrande" onMouseOut="this.className='boxgrande'" onClick="this.className='box1grande'" size="10">
                </td>
       </tr>
    <tr>
              <td align="right">
                      <code>La tua email: *</code>
             </td>
             <td>
                      <input name="emailmitt" class="boxgrande" onMouseOut="this.className='boxgrande'" onClick="this.className='box1grande'" size="10">
             </td>
      </tr>
      <tr>
                <td align="right">
                        <code>Nome dell'amico: *</code>
                </td>
                <td width="60%">
                        <input name="destinatario" class="boxgrande" onMouseOut="this.className='boxgrande'" onClick="this.className='box1grande'">
                </td>
    </tr>                                 
    <tr>
                <td align="right">
                        <code>Email dell'amico: *</code>
                </td>
                <td>
                        <input name="emaildest" class="boxgrande" onMouseOut="this.className='boxgrande'" onClick="this.className='box1grande'" size="10">
                </td>
      </tr>
        <tr>
                <td align="right">
                        <code>Eventuali informazioni:</code>
                </td>
                <td>
                        <textarea name="testo" rows="5" cols="18" class="boxgrande" onMouseOut="this.className='boxgrande'" onClick="this.className='box1grande'"></textarea>
              </td>
    </tr>
    <tr>
                <td colspan=2 align="center">
                        <input type="submit" value=" Invia " class="submit" onMouseOver="this.className='submitover'" onMouseOut="this.className='submit'" onFocus="Invio()">
                        <input type="reset" value="Cancella" class="submit" onMouseOver="this.className='submitover'" onMouseOut="this.className='submit'" onFocus="this.blur()">                        
              </td>
    </tr>
  </form>
</table>
</body>
</html>