width为什么在IE里不起作用呢?
我明明 
 body   {   margin:0px   auto; 
 	border:1px   solid   red; 
 	width:   780px; 
 	} 
 这里写了width:780px; 
 而且margin:0px   auto; 
 来让body宽度为780px了而且定义为居中,但为什么在IE里看BODY,还是满屏,而且不是居中呢。???   
 ++++++++++++   
  <html>  
  <head>  
  <style   type= "text/css ">  
  <!-- 
 *   {   margin:0;padding:0}   
 body   {   margin:0px   auto; 
 	border:1px   solid   red; 
 	width:   780px; 
 	} 
 div   {border:1px   dashed   blue;}   
 #header   { 
 	width:780px; 
 	height:90px; 
 	} 
 #nav   { 
 height:   25px; 
 width:   780px; 
 font-size:   14px; 
 list-style-type:   none; 
 } 
 #nav   li   { 
 float:left; 
 } 
 #nav   li   a{ 
 color:#000000; 
 text-decoration:none; 
 padding-top:4px; 
 display:block; 
 width:197px; 
 height:21px; 
 text-align:center; 
 background-color:   #009966; 
 margin-left:2px; 
 } 
 #nav   li   a:hover{ 
 background-color:#006633; 
 color:#FFFFFF; 
 } 
 #content   {width:780px;} 
 #content   p   {text-indent:5em;font-size:14px;} 
 #content   h2   {text-indent:1em;}   
 #footer   { 
 	width:780px; 
 	color:#ccc; 
 	background-color:#000; 
 	height:45px; 
 	text-align:center; 
 	padding-top:2px; 
 	} 
 -->  
  </style>  
  </head>  
  <body>  
  <div   id= "header ">  <img   src= "1.png "   alt= "1 ">  </div>  
  <ul   id= "nav ">  
  <li>  <a   href= "# "> 首页 </a>  </li>  <li>  <a   href= "# "> 资料 </a>  </li>  <li>  <a   href= "# "> 电影 </a>  </li>  
  </ul>  
  <div   id= "content ">  <h2> 目录 </h2>  <p> 11 </p>  </div>  
  <div   id= "footer ">  <p> love   |   sad   |   dark   |   dream </p>  <p> copyright@ning   2007 </p>  </div>  
  </body>  
  </html>
------解决方案--------------------..you can 's set your body 's width,   
 you can only use padding to move the content 's location.
------解决方案--------------------没有加上 
  <!DOCTYPE html PUBLIC  "-//W3C//DTD XHTML 1.0 Transitional//EN "  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
------解决方案--------------------jobnsonijl是对的. 
 body可以定义宽度. 
 声明一定要加,不然css会无效....
------解决方案--------------------原来BODY也可以设置WIDTH.... 
      习惯DIV了 呵呵