css
.nav{position:relative; width:400px}
.nav dt{float:left; margin:0 2px 0 0; position:relative; z-index:2}
.nav dt a{color:#555; text-decoration:none}
.nav dt a:hover{color:#000}
.nav dt a{
float:left; height:24px; line-height:26px; overflow:hidden;
background:url(/uploads/allimg/080903/2009570.gif) no-repeat 0 -24px
}
.nav dt a span{
display: block; padding:0 15px 0 0; margin:0 0 0 15px;
background:url(/uploads/allimg/080903/2009570.gif) no-repeat right -24px
}
.nav dt.on a{background-position:0 0}
.nav dt.on a span{background-position:right 0}
.nav dd{
background:#fff; border:solid 1px #ccc; width:400px; margin:0; padding:10px;
position:absolute; left:0; top:23px; z-index:1; visibility:hidden
}
.nav dd.on{visibility:visible}
/*-_-!*/
.nav dd a{display:block}
xhtml
<dl class="nav" id="maiji_tab">
<dt class="on"> <a href="#this" onclick="maiji_tab(0)"><span>精品文章</span></a> </dt>
<dt><a href="#this" onclick="maiji_tab(1)"><span>视频</span></a></dt>
<dt><a href="#this" onclick="maiji_tab(2)"><span>照片</span></a></dt>
<dt><a href="http://www.macji.com/blog" target="_blank"><span>麦鸡的博客</span></a></dt>
<dd class="on"> <p>精品文章啊!<a href="http://www.macji.com/blog" target="_blank">麦鸡的博客欢迎你!</a></p> </dd>
<dd> <p>视频啊!<a href="http://www.macji.com/blog" target="_blank">麦鸡的博客欢迎你!</a></p> </dd>
<dd> <p>你的照片呢?<a href="http://www.macji.com/blog" target="_blank">麦鸡的博客欢迎你!</a></p> </dd>
</dl>
javascript
var maiji_tab = function(num){//根据mun添加class,使它显示
var dtArray = document.getElementById('maiji_tab').getElementsByTagName("dt");//获取节点
var ddArray = document.getElementById('maiji_tab').getElementsByTagName("dd");
for (var i = 0; i < ddArray.length; i++){
dtArray[i].className = '';//取消class
ddArray[i].className = '';
}
dtArray[num].className = 'on';
ddArray[num].className = 'on';//增加class
}
实例运行代码框
提示：您可以先修改部分代码再运行