请问用ASP怎样实现这种功能？
请把代码复制到一个文本文件更名为.html后再运行。
<html>
<head>
<meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312">
<title>无标题</title>
<link rel="stylesheet" type="text/css">
<script language="JavaScript" type="text/JavaScript" src="/includes/browsecategory.js"></script>
</head>
<body bgcolor="#FFFFFF" topmargin="0" marginheight="5">
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<form name="productsearch1" method="get" action="http://www.enet.com.cn/marketplace/productfilter.jsp"; target="_blank" onsubmit="return dosubmitbs(this)">
<tr>
<td width="191"> <script language="JavaScript">
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// End -->
</script>
<select name="layer1id" onChange="fillSelectFromArray(productsearch1.layer2_id,this.selectedIndex)">
<option>全部大类</option>
<option value="2">整机</option>
<option value="95">数码</option>
<option value="7">配件</option>
<option value="28">办公外设</option>
<option value="52">耗材</option>
<option value="63">网络基础</option>
<option value="77">常用软件</option>
<option value="103">游戏</option>
<option value="114">通讯</option>
<option value="43148">无线网</option>
<option value="43009">综合布线</option>
<option value="48057">安防监控</option>
<option value="48065">网络安全</option>
<option value="47">投影显示</option>
<option value="248">语音视频</option>
<option value="999">网络存储</option>
</select>
<select name="layer2_id" style="width:90px">
<option>选择小类</option>
<!--option value="2_4">笔记本</option>
<option value="2_3">台式机</option>
<option value="2_00">服务器</option>
<option value="2_47337">单机多用户</option>
<option value="2_5">工作站</option>
<option value="2_6">准系统</option>
<option value="2_6">其他整机类产品</option-->
</select>
</td>
<input type="hidden" name="CategoryId" value="">
<!--input type="hidden" name="OnSale" value="1"-->
<input type='hidden' name='QPrice' value="">
</tr></form>
</table>
</body>
</html>
