麦鸡的TAB切换功能结合了javascript和css_导航菜单

.nav{position:relative}
.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; display:block; height:24px; line-height:26px; overflow:hidden;
background:url(/upload/20071217200212700.gif) no-repeat 0 -24px
}
.nav dt a span{
display: block; padding:0 15px 0 0; margin:0 0 0 15px;
background:url(/upload/20071217200212700.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}

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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
}