<style>
body{padding:0px;margin:0px;background:#cedd00;}
#banner{text-align:center;padding:0px;margin:0px; background:green;}
 #left{position:absolute;top:0px; left: 0px;background:red; width:190px; padding:0px;margin:0px;height:100;}
 #middle{margin:0px 190px 0px 190px; background:white;height:300px; padding:0px;}
 #right{position:absolute;top:0px; right: 0px;background:#FFff00;width:190px;padding:0px;margin:0px;height:300;}
#footer{text-align:center;padding:0px;margin:0px; background:green;}
</style>
    
<body> 
<!------------------------------------------------------------!>
<div id="mainbox"></div>
  <div id="left">left左</div>
  <div id="middle">正文内容</div>
  <div id="right">right右</div>
</div>
<!------------------------------------------------------------!> 
<div id="footer">footer底文本</div>
</body>