css中選項卡實現的程式碼

#title {
height: 30px;
width: 400px;
}
#title li {
float: left;
list-style-type: none;
height: 30px;
width: 132px;
line-height: 30px;
text-align: center;
margin-right: 1px;
}
#title a {
text-decoration: none;
display: block;
width: auto;
color: black;
}
#title a span{
display: block;
padding: 0 15px 0 15px;
}
#title #tag1 a:hover {
color: #ffffff;
background-color: #16a085;
width: auto;
}
#title #tag2 a:hover {
color: #ffffff;
background-color: #16a085;
width: auto;
}
#title #tag3 a:hover {
color: #ffffff;
width: auto;
background-color: #16a085;
}
#title a .selectspan1,#title a .selectspan2,#title a .selectspan3 {
display: block;
background-color: #84AF9B;
padding: 0 15px 0 15px;
}
#content ul {margin: 10px;}
#content li {margin: 5px; }
#content {
height: 300px;
padding-top: 20px;
}
.content1,.content2,.content3 {
border-top-color:#84AF9B ;
border-top-style:solid;
}
.hidecontent {display:none;}

function switchTag(tag,content)
{
//    alert(tag);
//    alert(content);
for(i=1; i <4; i++)
{
if ("tag"+i==tag)
{
document.getElementById(tag).getElementsByTagName("a")[0].className="selectli"+i;
document.getElementById(tag).getElementsByTagName("a")[0].getElementsByTagName("span")
[0].className="selectspan"+i;
}else{
document.getElementById("tag"+i).getElementsByTagName("a")[0].className="";
document.getElementById("tag"+i).getElementsByTagName("a")[0].getElementsByTagName("span")
[0].className="";
}
if ("content"+i==content)
{
document.getElementById(content).className="";
}else{
document.getElementById("content"+i).className="hidecontent";
}
document.getElementById("content").className=content;
}
}

<div id="title">
                <ul>
                <li id="tag1"><a href="#" onclick="switchTag(&#39;tag1&#39;,&#39;content1&#39;);this.blur();"class="selectli1"><span
                class="selectspan1">租</span></a></li>
                <li id="tag2"><a href="#" onclick="switchTag(&#39;tag2&#39;,&#39;content2&#39;);this.blur();"><span>优</span></a></li>
                <li id="tag3"><a href="#" onclick="switchTag(&#39;tag3&#39;,&#39;content3&#39;);this.blur();"><span>产</span></a></li>
                </ul>
            </div>
            <div id="content" class="content1"></div>
<div id="content2" class="hidecontent">22222</div>
                <div id="content3" class="hidecontent">3333333</div>