<html><HEAD><TITLE>下拉菜单</TITLE>
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<div  ><a href="#" onClick="showtree('autonomous')">北京市</a></div>
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<div class=tree_3>海淀</div>
<div class=tree_3>顺义</div>
<div class=tree_3>怀柔</div>
<div class=tree_3>密云</div>
<div class=tree_3>昌平</div>
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<div class=tree_1   ><a href="#"onClick="showtree('specially')">百家姓</a> </div>
<div id=specially_value class=tree_2 style="display:none">
<div class=tree_3>赵</div>
<div class=tree_3>钱</div>
<div class=tree_3>孙</div>
<div class=tree_3>李</div>
<div class=tree_3>周</div>
<div class=tree_3>吴</div>
<div class=tree_3>郑</div>
<div class=tree_3>王</div>

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