怎么写个这个类啊，根据鼠标在同一个地方显示不同的div

<div id="news" class="news_bg">

<ul class="t">

<li id="news1" onmouseover="setTab('news',1,3)" class="hover"><a href="/zixun99/" target="_blank">aa</a></li>

<li id="news2" onmouseover="setTab('news',2,3)"><a href="/tjyd/" target="_blank">bb</a></li>

<li id="news3" onmouseover="setTab('news',3,3)"><a href="/xsyj/" target="_blank">cc</a></li>

</ul>

</div>

function setTab(name,cursel,n){
for(i=1;i<=n;i++){
var menu=document.getElementById(name+i);
var con=document.getElementById(name+"_"+i);
menu.className=i==cursel?"hover":"";
con.style.display=i==cursel?"block":"none";
}
}