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<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
function categorychanged(enable) {
if (enable) {
document.test.category_parent.style.display="block";
}
else {
document.test.category_parent.style.display="none";
}
}
//-->
</script>
</head>
<body>
<form name="test">
<input type="checkbox" name="category_level" onchange="categorychanged(this.checked)">
<select name="category_parent" style="display:none">
<option value="1">1</option>
<option value="2">2</option>
</select>
</form>
</body>
</html>