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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script type="text/javascript">
function selected()
{
var em=document.getElementById("2");
em.selected=true;
}
</script>
</HEAD>
<BODY>
<select>
<option id="1">1 </option>
<option id="2">2 </option>
</select>
<input type="button" value="选中2" onclick="selected();">
</BODY>
</HTML>