<div id="main1" style="color:blue" onclick="document.all.child1.style.display=(document.all.child1.style.display =='none')?'':'none'" >
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<a href="#"><font size="2">- 子目录1</font></a><font size="2"> <br>
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<a href="#">- 子目录2</a> <br>
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<a href="#">- 子目录3</a> <br>
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<a href="#"><font size="2">- 子目录4</font></a>
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+ 主目录2 </div>
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&nbsp;
<a href="#"><font size="2">- 子目录1</font></a><font size="2"> <br>
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<a href="#">- 子目录2</a> <br>
&nbsp;
<a href="#">- 子目录3</a> </font>
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