新建一个html文档
在名为worp的div下有left和right的div，完整源代码如下：
<!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">
<!--
#worp {
padding: 0px;
width: 800px;
margin-top: 0px;
margin-right: auto;
margin-bottom: 0px;
margin-left: auto;
}
#worp #left {
background-color: #0000CC;
margin: 0px;
padding: 0px;
float: left;
width: 400px;
height: 100px;
}
#worp #right {
background-color: #FF0000;
float: right;
height: 100px;
width: 400px;
}
-->
</style>
</head>
<body>
<div id="worp">
<div id="left">此处显示 id "left" 的内容</div>
<div id="right">此处显示 id "left" 的内容</div>
</div>
</body>
</html>
