<head>
<script type="text/javascript">
function change_div(id){
if (id == 'gsywly' )
{
document.getElementById("gsgs").style.display = 'none' ;
document.getElementById("gsywly").style.display = 'block' ;
}
else
{
document.getElementById("gsywly").style.display = 'none' ;
document.getElementById("gsgs").style.display = 'block' ;
}
}
</script>
<style type="text/css">
#gsywly {
display:none;
}
</style>
</head>
<body>
<div id="button">
<ul>
<li id="a"><a href="#" onclick="change_div('gsgs')">公司概述</a></li>
<li id="b"><a href="#" onclick="change_div('gsywly')">公司業務領域</a></li>
</ul>
</div>
<div id="gsgs">
<h2>公司概述</h2>
</div>
<div id="gsywly" >
<h2>公司業務領域</h2>
</div>
</body>