tab切换
在tab切换里我想点击标题一下是切换内容，点击两下是跳转网页，应该怎么加？？
<body>
<div class="zong">
<h2>
<span onclick="dianji(this)">社会</a></span>
<span onclick="dianji(this)">探索</span>
<span class="select" onclick="dianji(this)">摄影</span>
<span onclick="dianji(this)">原创音乐</span>
</h2>
<div class="kong"></div>
<div class="center"></div>
<div class="center"></div>
<div class="center" id="show"></div>
<div class="center"></div>
</div>
</body>
<script type="text/javascript">
var spans=document.getElementsByTagName("span");
var divs=document.getElementsByTagName("div");
function dianji(x){
for(var i=0;i<spans.length;i++){
if(spans[i]==x){
spans[i].className="select";
divs[i+2].id="show";
}else{
spans[i].className="";
divs[i+2].id="";
}
}
}
</script>
