<title>【荐】JS封装的一个无限级的下拉树形菜单_网页代码站(www.webdm.cn)</title>
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*{ margin:0; padding:0; list-style:none;}
body { margin:20px;}
h2 { font-family:"黑体"; font-size:24px; text-align:center; line-height:32px;}
h5 { font-size:12px; text-align:center; font-weight:normal; color:#666; line-height:28px;}
#nav a { text-decoration:underline;color:#06c; font-size:14px; line-height:24px;}
#nav ul{ margin-bottom:5px;}
#nav strong{ color:#696;}
#nav.dyn li ul{ display:none;}
#nav.dyn li ul.show{ display:block;}
#nav.dyn li{ padding-left:15px;}
#nav.dyn li.parent{ background:url(http://www.webdm.cn/images/20101213/3/user_23.gif) 5px 10px no-repeat;}
#nav.dyn li.open{ background:url(http://www.webdm.cn/images/20101213/3/user_23.gif) 5px -34px no-repeat;}
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<script type="text/javascript">
DOMhelp = {
debugWindowId:…………………………………………………………………………
原文:http://www.verydemo.com/demo_c104_i38031.html