树型菜单问题


<table cellpadding="0" cellspacing="0" width="158" align="center">
<tr> 
<td height="25" class="menu_title" onmouseover=this.className='menu_title2'; onmouseout=this.className='menu_title'; background="images/admin_left_1.gif" id=menuTitle1> 
<div align="center">
<strong>数据操作</strong>
</div>
</td>
</tr>
<tr> 
<td height="25" bgcolor="#66CC99" class="menu_title" id="menuTitle1" style="cursor:hand;" onClick="showsubmenu_d(1)" onmouseover=this.className='menu_title2'; onmouseout=this.className='menu_title';> 
<div>
<font color="#000000">
<strong>&nbsp;查询</strong>
</font>
</div>
</tr>
<tr> 
<td style="display:none" id="submenu1">
<div class="sec_menu" style="width:158"> 
<table cellpadding="0" cellspacing="0" align="center" width="130">
<tr> 
<td height=20>▪测试1</td>
</tr>
</table>
</div>
</td>
</tr>
<tr> 
<td style="display:none" id="submenu2">
<div class="sec_menu" style="width:158"> 
<table cellpadding="0" cellspacing="0" align="center" width="130">
<tr> 
<td height=20>▪测试2</td>
</tr>
</table>
</div>
</td>
</tr>
</table>求个脚本，点查询显示测试1，点测试1显示测试2