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<td>
<select id="sel_b" runat="server"> </select> <input id="hd_b" type="hidden" runat="server" />
<select id="sel_s" runat="server"> </select> <input id="hd_s" type="hidden" runat="server" />
<script type="text/javascript">
var arr_b = new Array("单位概况","政策法规","信息公开","公告栏","工作动态");
var arr_s = new Array(new Array("单位介绍", "大事记"), new Array("最新文件","国家法律","地方法规"),new Array("部门职责","部门职能","办事指南"),new Array("公告栏"),new Array("工作动态"));
function bind_b()
{
var sel = document.getElementById("sel_b");
sel.length = 0;
for(var i=0; i <arr_b.length; i++)
sel.options[i] = new Option(arr_b[i], arr_b[i]);
bind_s();
document.getElementById("ctl00_ContentPlaceHolder1_hd_b").value = arr_b[0];
sel.onchange = function(){ bind_s(); document.getElementById("ctl00_ContentPlaceHolder1_hd_b").value = sel.value;};
}
function bind_s()
{
var arr = arr_s[document.getElementById("sel_b").selectedIndex];
var sel = document.getElementById("sel_s");
sel.length = 0;
for(var i=0; i <arr.length; i++)
sel.options[i] = new Option(arr[i], arr[i]);
document.getElementById("ctl00_ContentPlaceHolder1_hd_s").value = arr[0];
sel.onchange = function(){ document.getElementById("ctl00_ContentPlaceHolder1_hd_s").value = sel.value;};
}
bind_b();
</script>