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<html>
<head>
<style type="text/css">
body
{ text-align:center; margin:0px}
#container
{ width:900px;}
#top
{ width:900px; height:100px; background:#000000 }
#middle
{ widows:900px; height:400px;}
#middle_left
{ width:200px; height:400px; float:left; background:#FF0000}
#middle_right
{ width:700px; height:400px; float:right; background:#0000FF}
#end
{ width:900px; height:100px; background:#33FF00}
</style>
</head>
<body>
<!-- 整个网页设计包含于container容器中 -->
<div id="container">
<div id="top"></div>
<div id="middle">
<div id="middle_left"></div>
<div id="middle_right"></div>
</div>
<div id="end"></div>
</div>
</body>
</html>