<html>
<head><meta charset="utf-8">
<style>
.back{
background-color: aqua;
}
.headerc{
font-style: red;
background-color: yellow;
}
.header{
}
</style>
<script>
function block1(o){
var ii1=document.getElementById("div1");
var ii2=document.getElementById("div2");
var ii3=document.getElementById("div3");
var ia1=document.getElementById("a1");
var ia2=document.getElementById("a2");
var ia3=document.getElementById("a3");
switch(o){
case 1:
ii1.style.display="inline";
ii1.style.display="block";
ii2.style.display="none";
ii3.style.display="none";
ia1.className="headerc";
ia2.className="header";
ia3.className="header";
break;
case 2:
ii2.style.display="inline";
ii2.style.display="block";
ii1.style.display="none";
ii3.style.display="none";
ia2.className="headerc";
ia1.className="header";
ia3.className="header";
break;
case 3:
ii3.style.display="inline";
ii3.style.display="block";
ii1.style.display="none";
ii2.style.display="none";
ia3.className="headerc";
ia2.className="header";
ia1.className="header";
break;
}
}
</script>
</head>
<body>
<table id="mytable"border="1"cellspacing="0"width="200">
<tr>
<td><div id="a1"onclick="block1(1)">国际</div></td>
<td><div id="a2"onclick="block1(2)">军事</div></td>
<td><div id="a3"onclick="block1(3)">要闻</div></td>
</tr>
</table>
<div class="back">
<div id="div1" style="display:none">
国际新闻
</div>
<div id="div2" style="display:none">
军事新闻
</div>
<div id="div3" style="display:none">
要问闻吻温
</div>
</div>
</body>
</html>