codice:
<form method="post" action="?id=controlla">
<p align="center">
<input type="password" name="passwd" style="border-style:solid; border-width:1; font-family: Verdana; font-size: 8 pt" size="18">

<input type="submit" name="Submit" value="Accedi" style="border-style:solid; border-width:1; font-family: Verdana; font-size: 8 pt" size="20"></p>
</p>
</form>
</font>[/b]</td>
    </tr>
  </table>
  </center>
</div>
<?php
}

if($id == "controlla"){
if ($passwd==$passwordz){
print("<script>document.location='prova.htm'</script>");
}else{
echo "Ciao";
}
}
echo "</body></html>";
?>