<!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" />
<style type="text/css">
#header {
960px;
height:40px;
margin: 10px auto;
background: lightblue;
}
#nav {
960px;
height:40px;
margin: 0 auto;
background: lightblue;
}
#content {
960px;
height:440px;
margin: 10px auto;
background: lightblue;
}
#main {
700px;
height: 420px;
background: lightyellow;
float: left;
margin: 10px 10px;
}
#side {
200px;
height: 420px;
background: lightyellow;
float: right;
margin: 10px 10px;
}
#footer {
960px;
height: 40px;
background: lightyellow;
margin: 10px auto;
}
</style>
</head>
<body>
<div id="header">header</div>
<div id="nav">nav</div>
<div id="content">
<div id="main">main</div>
<div id="side">side</div>
</div>
<div id="footer">footer</div>
</body>
</html>