Posto il codice non funzionante:

codice:
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script> 
<script type="text/javascript"> 
$('#titles').change(function() {
    location.href = location.href + "?value=" + $(this).val();
});
</script>
</head>

<body>
<?
$cardinali=$_GET[value];
echo ("$cardinale 
");
?>
<select name="selTitle" id="titles">
<option value="00">First</option>
<option value="01">Second</option>
<option value="02">Third</option>
<option value="03">Fourth</option>
<option value="04">Fifth</option>
</select>
</body>
</html>
THX