<!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>大庆师范学院</title>
<style type="text/css">
body{margin:0; padding:0}
#top{width:auto; height:110px; background:#777777;}
#main{ width:1010px; height:auto; margin:0 auto; background:#AAAAAA;}
#left{width:750px; height:600px; float:left; background:#33FF99;}
#sub_u{width:750;}
#sub_d{}
#right{ width:260px; height:600px; float:right; background:#00FF00;}
#foot{
width:1010px;
height:70px;
background:#555;
margin:0 auto;
}
</style>
</head>
<body>
<body>
<div id="top" ></div>
<div id="main">
<div id="left">
<div id="sub_u"></div>
<div id="sub_d"></div>
</div>
<div id="right"></div>
</div>
<div id="foot"></div>
</body>
</html>
上边为代码，设置的ID为“foot”的块状元素无法显示怎么改？？？？
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