<!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=utf-8" />
<title>下拉列表1</title>
<style type="text/css">
.a{
200px; height:100px; background-color:#0C6; position: absolute; cursor:pointer; overflow: hidden}
.a:hover{
overflow:visible}
.b{
200px; height:100px; background-color:#06F; top:100px; position: absolute; overflow: hidden}
.b:hover{
overflow:visible}
.c{
200px; height:100px; background-color:#FF3; left:200px; position:absolute;}
.d{
200px; height:100px; background-color:#C93; top:200px; position:absolute; overflow:hidden}
.d:hover{
overflow:visible}
.e{
200px; height:100px; background-color:#F69; left:200px; position:absolute;}
.f{
200px; height:100px; background-color:#F69; top:300px; position:absolute; overflow:hidden}
.f:hover{
overflow:visible}
.g{
200px; height:100px; background-color:#F0F; left:200px; position:absolute;}
</style>
</head>
<body>
<div class="a"><div class="b"><div class="c"></div></div>
<div class="d"><div class="e"></div></div>
<div class="f"><div class="g"></div></div>
</div>
</body>
</html>