<table><tr><td id="Menu1" οnclick="javascript:ShowMenuList(this);" >栏目1</td><td id="Menu2" οnclick="javascript:ShowMenuList(this);">栏目2</td><td id="Menu3" οnclick="javascript:ShowMenuList(this);">栏目3</td></tr>
<tr>
<td colspan="3">
<div id="List_Menu1" style="display:;">内容1</div>
<div id="List_Menu2" style="display:none;">内容2</div>
<div id="List_Menu3" style="display:none;">内容3</div>
</td>
</tr>
</table>
<script language="javascript" type="text/javascript">
var tdnn;
tdnn = 1;
function ShowMenuList(e) {
List_Menu1.style.display = "none";
List_Menu2.style.display = "none";
List_Menu3.style.display = "none";
eval("List_" + e.id).style.display = "";
}
</script>