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<body>
<table width="100%" border="0">
<tr>
<td>
<div>
<ul id="ul1">
<!-- <li id="roothead">News </li>
<ul id="foldinglist" style="display:none" style=&{head};>
<li> <a href="http://www.cnn.com">CNN </a> </li>
<li> <a href="http://www.abcnews.com">ABC News </a> </li>
<li> <a href="http://www.vancouversun.com">Vancouver Sun </a> </li>
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<li >内容 </li>
<ul id="foldinglist" style=&{head};>
<li id="roothead">一年级 </li>
<ul id="foldinglist" style=&{head};>
<li id="roothead">班级数=3 </li>
<ul id="foldinglist" style=&{head};>
<li id="roothead">1班 </li>
<ul id="foldinglist" style=&{head};>
<li> <a href="#">老师数 </a> <input type="text" name="table_id"/> </li>
<li> <a href="#">学生数 </a> <input type="text" name="table_id_extension"/> </li>
<li> <a href="#">课程数 </a> <input type="text" name="table_id"/> </li>
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<li id="roothead">2班 </li>
<ul id="foldinglist" style=&{head};>
<li> <a href="#">老师数 </a> <input type="text" name="table_id"/> </li>
<li> <a href="#">学生数 </a> <input type="text" name="table_id_extension"/> </li>
<li> <a href="#">课程数 </a> <input type="text" name="table_id"/> </li>
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</ul>
</ul>
</div>
<input type="button" onclick="show()" value="全部打开" /><input type="button" onclick="hidden()" value="关闭" />
</td>
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</table>
</body>
</html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Insert title here </title>
<style>
<!--
#roothead{
display:none;
cursor:hand ; font-weight:bold ;
list-style-image:url(top.gif)}
#foldinglist{list-style-image:url(list.gif)}
//-->
</style>
<script language="JavaScript1.2">
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var head="display:''"
img1=new Image()
img1.src="top.gif"
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img2.src="open.gif"
function change()
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</head>
<body>
<table width="100%" border="0">
<tr>
<td>
<div>
<ul id="ul1">
<!-- <li id="roothead">News </li>
<ul id="foldinglist" style="display:none" style=&{head};>
<li> <a href="http://www.cnn.com">CNN </a> </li>
<li> <a href="http://www.abcnews.com">ABC News </a> </li>
<li> <a href="http://www.vancouversun.com">Vancouver Sun </a> </li>
</ul>-->
<li >内容 </li>
<ul id="foldinglist" style=&{head};>
<li id="roothead">一年级 </li>
<ul id="foldinglist" style=&{head};>
<li id="roothead">班级数=3 </li>
<ul id="foldinglist" style=&{head};>
<li id="roothead">1班 </li>
<ul id="foldinglist" style=&{head};>
<li> <a href="#">老师数 </a> <input type="text" name="table_id"/> </li>
<li> <a href="#">学生数 </a> <input type="text" name="table_id_extension"/> </li>
<li> <a href="#">课程数 </a> <input type="text" name="table_id"/> </li>
</ul>
<li id="roothead">2班 </li>
<ul id="foldinglist" style=&{head};>
<li> <a href="#">老师数 </a> <input type="text" name="table_id"/> </li>
<li> <a href="#">学生数 </a> <input type="text" name="table_id_extension"/> </li>
<li> <a href="#">课程数 </a> <input type="text" name="table_id"/> </li>
</ul>
</ul>
</ul>
</div>
<input type="button" onclick="show()" value="全部打开" /><input type="button" onclick="hidden()" value="关闭" />
</td>
</tr>
</table>
</body>
</html>
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