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<title>无标题文档</title>
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<div id="main1" style="color:blue" onclick="document.all.child1.style.display=(document.all.child1.style.display =='none')?'':'none'" >
+ 主目录1</div>
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<a href="#">- 子目录1</a> <br>
<a href="#">- 子目录2</a> <br>
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</div>
<div id="main2" style="color:blue" onclick="document.all.child2.style.display=(document.all.child2.style.display =='none')?'':'none'" >
+ 主目录2 </div>
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<a href="#">- 子目录1</a> <br>
<a href="#">- 子目录2</a> <br>
<a href="#">- 子目录3</a>
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