这是一个菜单,有人能帮我改成点击一个其他都收起来而不是现在的只有点自己才收回
<%@LANGUAGE= "VBSCRIPT " CODEPAGE= "936 "%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN " "http://www.w3.org/TR/html4/loose.dtd ">
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
<title> 无标题文档 </title>
</head>
<body>
<table cellspacing= "0 " cellpadding= "0 " width= "158 " align= "center ">
<td id= "imgmenu2 " class= "menu_title " onMouseOver= "this.className= 'menu_title2 '; " onClick= "showsubmenu(2) " onMouseOut= "this.className= 'menu_title '; " style= "cursor:hand " background= "image/menudown.gif " height= "25 ">
公司简介 </td>
</tr>
<tr>
<td id= "submenu2 " style= "DISPLAY: none ">
<div class= "sec_menu " style= "WIDTH: 158px ">
<table cellspacing= "3 " cellpadding= "0 " width= "130 " align= "center ">
<tr>
<td> <a href= "Manage_culture.asp " target= "main "> 企业文化 </a> </td>
</tr>
<tr>
<td> <a href= "Manage_cultureNewsAdd.asp " target= "main "> 企业文化 </a> </td>
</tr>
</table>
</div>
<br>
</td>
</tr>
<!--tr>
<td id= "imgmenu5 " class= "menu_title " onMouseOver= "this.className= 'menu_title2 '; " onClick= "showsubmenu(5) " onMouseOut= "this.className= 'menu_title '; " style= "cursor:hand " background= "image/menudown.gif " height= "25 ">
<span> 会员管理 </span> </td>
</tr>
<tr>
<td id= "submenu5 " style= "DISPLAY: none ">
<div class= "sec_menu " style= "WIDTH: 158px &