求高手一段JS代码!
JS控制页面大小.使页面内容随窗口大小自适应.   
 现有这段页面代码.它的JS应该怎么写呢?   
 页面效果可参照         www.126.com首页效果.   
 请大虾们帮忙了.   
 代码如下:      
  <!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 "   />  
  <title> 无标题文档 </title>  
  <style   type= "text/css ">  
  <!-- 
 *{ 
 	margin:0; 
 	padding:0; 
 } 
 body   { 
 	font-size:12px; 
 	background:#fff; 
 } 
 #col{ 
 	width:100%; 
 	margin:0   auto; 
 } 
 #top{ 
 	width:500px; 
 	height:130px; 
 	margin:0   auto; 
 	padding:10px; 
 	background:#66CCFF; 
 } 
 #content{ 
 	width:500px; 
 	height:350px; 
 	margin:0   auto; 
 	padding:10px; 
 } 
 #footer{ 
 	width:500px; 
 	height:130px; 
 	margin:0   auto; 
 	padding:10px; 
 	background:#66CCFF; 
 } 
 -->  
  </style>  </head>    
  <body>  
  <div   id= "top ">  <h1> logo </h1>  </div>  
  <form   id= "form1 "   name= "form1 "   method= "post "   action= " ">  <div   id= "content "> 公测用户 <input   type= "submit "   name= "Submit "   value= "立即登录 "   />  </div>  </form>  
  <div   id= "footer "> 版权信息 </div>  
  </body>  
  </html>
------解决方案-------------------- <!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 " />  
  <title> 无标题文档 </title>  
  <style type= "text/css ">  
  <!-- 
 *{ 
 	margin:0; 
 	padding:0; 
 } 
 body { 
 	font-size:12px; 
 	background:#fff; 
 } 
 #col{ 
 	width:100%; 
 	margin:0 auto; 
 } 
 #top{ 
 	margin:0 auto; 
 	padding:10px; 
 	background:#66CCFF; 
 } 
 #content{ 
 	margin:0 auto; 
 	padding:10px; 
 } 
 #footer{ 
 	margin:0 auto; 
 	padding:10px; 
 	background:#66CCFF; 
 } 
 -->  
  </style>  
  <script>  
 function resizeDiv() 
 { 
 	var documentWidth = document.documentElement.clientWidth; 
 	document.getElementById( "top ").style.width = document.getElementById( "footer ").style.width = document.getElementById( "content ").style.width = documentWidth -20;  	 
 	var documentHeight = document.documentElement.clientHeight; 
 	document.getElementById( "top ").style.height = document.getElementById( "footer ").style.height = parseInt(documentHeight * 0.25); 
 	document.getElementById( "content ").style.height = parseInt(documentHeight * 0.5) - 60; 
 } 
 window.onload = window.onresize = resizeDiv; 
  </script>  
  </head>    
  <body>  
  <div id= "top ">  <h1> logo </h1>  </div>  
  <form id= "form1 "