在用DIV+CSS排版时，经常要使左右两边栏目自动等高。这里介绍个简单方法~~
<!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>无标题文档</title>
<style type="text/css">
#main{background:#009900; width:900px; overflow:auto; } /*注意这里了：填充背景色，设置overflow:auto; 问题解决*/
#left{background:#ccc; float:left; width:600px; height:600px;}
#right{background:#009900; float:left; width:300px; height:300px;}
#footer{width:900px;background:#FFFF66;}
</style>
</head>
<body>
<div id="main">
<div id="left"><h1>左边</h1></div>
<div id="right"><h1>右边</h1></div>
</div>
<div id="footer"><h1>页脚</h1></div>
</body>
</html>
