网页菜单之---树形目录

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<li id="foldheader">Games</li>
<ul id="foldinglist" style="display:none" style=&{head};>
<li><a href="http://www.gamespot.com">GameSpot</a></li>
<li><a href="http://www.happypuppy.com">Happy Puppy</a></li>
<li><a href="http://www.gamecenter.com">Game Center</a></li>
</ul>

<li id="foldheader">Software</li>
<ul id="foldinglist" style="display:none" style=&{head};>
<li><a href="http://www.download.com">outer 1</a></li>
<li><a href="http://www.hotfiles.com">outer 2</a></li>
<li id="foldheader">Nested</li>
<ul id="foldinglist" style="display:none" style=&{head};>
<li><a href="http://www.windows95.com">nested 1</a></li>
<li><a href="http://www.shareware.com">nested 2</a></li>
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<li><a href="http://www.windows95.com">outer 3</a></li>
<li><a href="http://www.shareware.com">outer 4</a></li>
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