<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<style>
ul,h2{margin: 0; padding: 0;}
li{list-style-type: none;}
#list{width: 240px; border: 1px solid black; margin: 0 auto;}
#list h2{text-indent: 16px;background: url(img/ico1.gif) no-repeat 5px center dodgerblue;}
#list ul li{text-indent: 24px;border: 1px solid black;}
#list ul {display: none;}
#list .active { background:url(img/ico2.gif) no-repeat 5px center #FF9; color:#000; }
#list ul .hover { background:#6FF; }
</style>
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<body>
<ul id="list">
<li class="lis">
<h2>我的好友</h2>
<ul>
<li>张一</li>
<li>张二</li>
<li>张三</li>
</ul>
</li>
<li class="lis">
<h2>企业好友</h2>
<ul>
<li>李一</li>
<li>李二</li>
<li>李三</li>
</ul>
</li>
<li class="lis">
<h2>黑名单</h2>
<ul>
<li>王一</li>
<li>王二</li>
<li>王三</li>
</ul>
</li>
</ul>
</body>
</html>