问下大家,该如何解决

问下大家
一个html   的下拉菜单
<SELECT   id= "Select1 "   name= "CID_SELECT "   runat= "server "   > </SELECT>
怎么实现
asp:DropDownList   中的   AutoPostBack= "True "的效果
好象应该是个js代码，会的写下啊


------解决方案--------------------------------------------------------
<SELECT id= "Select1 " name= "CID_SELECT " runat= "server "
(这儿加属性)onchange= "onSelectedChange() "> </SELECT>
<script>
function onSelectedChange()
{
//脚本实现
}
</script>