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<html>
<body>
<form name="form2" method="post" action="">
<select name="select1">
<optgroup id="optg1">
<option id="opt1_1">first</option>
<option>second</option>
<option>third</option>
</optgroup>
<optgroup id="optg2">
<option>first item in second group </option>
<option id="opt2_2">second item in second group </option>
<option>third item in second group </option>
</optgroup>
<script language="JavaScript">
document.getElementById("optg1").label = "first group";
document.getElementById("optg2").label = "second group";
</script>
</select>
</form>
</body>
</html>
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