<!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>大慶師范學(xué)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>
上邊為代碼，設(shè)置的ID為“foot”的塊狀元素?zé)o法顯示怎么改？？？？
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