JS版无限级网页折叠菜单，类似于树形菜单
<html>
<head>
<title>无限级折叠菜单JS版</title>
<style>
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-->
</style>
</head>
<body>
<div id="menu">
<h3>无限级折叠菜单JavaScript版</h3>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_1_1</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_2_1</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_3_1</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_4_1</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_3_2</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_4_1</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_2_2</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_3_1</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_4_1</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_3_2</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_4_1</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_1_2</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_2_1</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_3_1</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_4_1</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_3_2</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_4_1</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_2_2</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_3_1</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_4_1</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_3_2</a>
<ul>
<li><em></em><a href='javascript:void(0);'>菜单_4_1</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
<li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a>
<ul>
<li><a href='javascript:void(0);'>菜单_5_1</a></li>
<li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
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