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<html>
<head>
<title>test</title>
<script src="jquery-1.3.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
$("select[name='displayid']").change(
function(){
var item = $("select[name='displayid']").val();
alert(item);
});
});
</script>
</head>
<body>
<select name="displayid" id="displayid">
<option value="0" selected>0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</body>
</html>