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


/*
<div id="Tab1"> 
<div class="Menubox"> 
<ul> 
<li id="one1" onmouseover="setTab('one',1,4)"  class="hover">新闻1</li> 
<li id="one2" onmouseover="setTab('one',2,4)" >新闻2</li> 
<li id="one3" onmouseover="setTab('one',3,4)">新闻3</li>   
<li id="one4" onmouseover="setTab('one',4,4)">新闻4</li> 
</ul> 
</div> 
<div class="Contentbox">  
<div id="con_one_1" class="hover">新闻列表1</div> 
<div id="con_one_2" style="display:none">新闻列表2</div> 
<div id="con_one_3" style="display:none">新闻列表3</div> 
<div id="con_one_4" style="display:none">新闻列表4</div>  
</div> 
</div> 
<br> 
<div id="Tab2"> 
<div class="Menubox"> 
<ul> 
<li id="two1" onmouseover="setTab('two',1,4)"  class="hover">新闻1</li> 
<li id="two2" onmouseover="setTab('two',2,4)" >新闻2</li> 
<li id="two3" onmouseover="setTab('two',3,4)">新闻3</li>   
<li id="two4" onmouseover="setTab('two',4,4)">新闻4</li> 
</ul> 
</div> 
<div class="Contentbox">  
<div id="con_two_1" >新闻列表1</div> 
<div id="con_two_2" style="display:none">新闻列表2</div> 
<div id="con_two_3" style="display:none">新闻列表3</div> 
<div id="con_two_4" style="display:none">新闻列表4</div>  
</div> 
</div> 

<div id="Tab3"> 
<div class="Menubox"> 
<ul> 
<li id="three1" onmouseover="setTab('three',1,4)"  class="hover">新闻1</li> 
<li id="three2" onmouseover="setTab('three',2,4)" >新闻2</li> 
<li id="three3" onmouseover="setTab('three',3,4)">新闻3</li>   
<li id="three4" onmouseover="setTab('three',4,4)">新闻4</li> 
</ul> 
</div> 
<div class="Contentbox">  
<div id="con_three_1" >新闻列表1</div> 
<div id="con_three_2" style="display:none">新闻列表2</div> 
<div id="con_three_3" style="display:none">新闻列表3</div> 
<div id="con_three_4" style="display:none">新闻列表4</div>  
</div> */