<html>
<head>
<!--民族代码自动生成 开始 -->
<script language="javascript">
<!--
function changemzdm()
{
T28.options[T14.selectedIndex].selected = true;
}
-->
</script>
</head>
<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<form name="addNEWS" method="post" action="index_a.asp" onSubmit="return CheckForm();">
民族：<select name="T14" id="T14" onChange="changemzdm()" style="width:100px;" class="shadow">
<option selected="selected" value="" >请选择...</option>
<option value="汉族">汉族</option>
<option value="蒙古族">蒙古族</option>
<option value="回族">回族</option>
<option value="藏族">藏族</option>
<option value="维吾尔族">维吾尔族</option>
<option value="苗族">苗族</option>
<option value="彝族">彝族</option>
<option value="壮族">壮族</option>
<option value="布依族">布依族</option>
<option value="朝鲜族">朝鲜族</option>
<option value="满族">满族</option>
</select>
<tr align="center" height="39">
<td width="150" class="STYLE2" bgcolor="#D6EAE3">民族代码：</td>
<td width="325" class="STYLE2">
<select id="T28">民族
<option selected="selected" value="" >请等待系统自行选择...</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
</select>
</form>
</body>
</html>
------解决方案--------------------
var ...就可以了