代碼都在這，我這圖片有不可以上傳，妳自己設計壹個也行呀
給妳看個事例：
<script language="javascript" type="text/javascript">
if (document.getElementById){ //DynamicDrive.com change
document.write('<style type="text/css">\n')
document.write('.submenu{display: none;}\n')
document.write('</style>\n')
}
function SwitchMenu(obj){
if(document.getElementById){
var el = document.getElementById(obj);
var ar = document.getElementById("masterdiv").getElementsByTagName("span"); //DynamicDrive.com change
if(el.style.display != "block"){ //DynamicDrive.com change
for (var i=0; i<ar.length; i++){
if (ar[i].className=="submenu") //DynamicDrive.com change
ar[i].style.display = "none";
}
el.style.display = "block";
}else{
el.style.display = "none";
}
}
}
function killErrors() {
return true;
}
window.onerror = killErrors;
</script>
<table width="180" height="100%" border="0" cellpadding="0" cellspacing="0" class="HeaderTdStyle">
<tr>
<td align="center" valign="top"><table width="100%" height="24" border="0" cellpadding="0" cellspacing="0">
<tr>
<td align="center">系統管理</td>
</tr>
</table>
<table width="100%" height="90%" border="0" cellpadding="0" cellspacing="0" class="MenuBg">
<tr>
<td align="center" valign="top">
<div id="masterdiv" style="
margin:20px 0px 10px 15px;width:100%;text-align:left;"><div class="menutitle1" onClick="SwitchMenu('sub1')"><img src="image/Left_1.gif" /><a href="#">系列設置</a></div>
<span class="submenu" id="sub1">
<table width="90%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="30%" height="20" align="right"><img src="image/Left_1_1.gif" width="29" height="16"></td>
<td width="66%" valign="bottom"><a href="Manage_Admin.asp" target="main">管理員管理</a></td>
</tr>
<tr>
<td height="20" align="right"><img src="image/Left_1_1.gif" width="29" height="16"></td>
<td valign="bottom"><a href="Manage_backup.asp" target="main">數據庫備份</a></td>
</tr>
<tr>
<td height="20" align="right"><img src="image/Left_1_1.gif" width="29" height="16"></td>
<td valign="bottom"><a href="help.htm" target="main">系統幫助</a></td>
</tr>
<tr>
<td height="20" align="right"><img src="image/Left_1_1.gif" width="29" height="16"></td>
<td valign="bottom"><a href="UploadFileManage.asp" target="main">上傳文件管理</a></td>
</tr>
</table>
</span>
<div class="menutitle1" onClick="SwitchMenu('sub8')"><img src="image/Left_1.gif"/><a href="#">公告/新聞動態管理</a></div>
<span class="submenu" id="sub8">
<table width="90%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td height="20" align="right"><img src="image/Left_1_1.gif" width="29" height="16"></td>
<td valign="bottom"><a href="add_newnotes.asp" target="main">添加公告/通知</a> </td>
</tr>
<tr>
<td height="20" align="right"><img src="image/Left_1_1.gif" width="29" height="16" /></td>
<td valign="bottom"><a href="Manage_newnotes.asp" target="main">管理公告/通知</a></td>
</tr>
<tr>
<td height="20" align="right"><img src="image/Left_1_1.gif" width="29" height="16" /></td>
<td valign="bottom"><a href="add_newsdongtai.asp" target="main">添加最新動態</a></td>
</tr>
<tr>
<td height="20" align="right"><img src="image/Left_1_1.gif" width="29" height="16" /></td>
<td valign="bottom"><a href="Manage_newdongtai.asp" target="main">管理最新動態</a></td>
</tr>
</table>
</span>
修該時：
<div class="menutitle1" onClick="SwitchMenu('sub9')">
<span class="submenu" id="sub9">
這 sub 名字要對應好，
多個樹叉，就過個這段代碼