<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>层切换</title>
<style>
#red{
display:block;
float:left;
position:absolute;
width:400px;
height:400px;
background-color:#ff0000;
}
#green{
display:none;
float:left;
position:absolute;
width:400px;
height:400px;
background-color:#00ff00;
}
#blue{
display:none;
float:left;
position:absolute;
width:400px;
height:400px;
background-color:#0000ff;
}
#switch{
position:absolute;
top:400px;
width:400px;
height:30px;
background-color:#000000;
}
#switch a.tabs{
float:left;
color:#ffffff;
height:22px;
width:60px;
margin:0;
padding:8px 0 0 28px;
font-size:12px;
cursor:pointer;
text-decoration:none;
}
#switch a.tabs:hover{
color:#ffff00;
background-color:#666666;
text-decoration:none;
}
</style>
<script language="javascript">
function switchbox(i)
{
selectbox(i);
}
function selectbox(i)
{
switch(i)
{
case 1:
document.getElementById("red").style.display="block";
document.getElementById("green").style.display="none";
document.getElementById("blue").style.display="none";
break;
case 2:
document.getElementById("red").style.display="none";
document.getElementById("green").style.display="block";
document.getElementById("blue").style.display="none";
break;
case 3:
document.getElementById("red").style.display="none";
document.getElementById("green").style.display="none";
document.getElementById("blue").style.display="block";
break;
}
}
</script>
</head>
<body>
<div id="content">
<div id="red"></div>
<div id="green"></div>
<div id="blue"></div>
</div>
<div id="switch"><a class="tabs" id="red-tab" href="javascript:switchbox(1);">红色</a><a class="tabs" id="green-tab" href="javascript:switchbox(2);">绿色</a><a class="tabs" id="blue-tab" href="javascript:switchbox(3);">蓝色</a></div>
</body>
</html>
一个很好的例子，类似的还有这个网站所使用的方法（www.komodomedia.com）
让IE支持透明PNG：filterrogidXImageTransform.Microsoft.AlphaImageLoader(src='/includes/themes/business/images/great_links.png',sizingMethod='crop');