CSS+DIV一行三列,等宽高,有间距怎么写??

CSS+DIV一行三列(等宽高,有间距)怎么写?(适合所有浏览器)

比如:这个宽为980px 然后三列都320px 剩下的就是他们中间的间距.

适合所有浏览器的写法!

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">
#wrapper { width: 980px; margin: 0 auto; }
#header {width: 100%; background: #cfc;}
#container { width: 100%; }
#container #left,#container #content, #container #right { width: 320px; float: left }
#left { background: #fc0;}
#content { margin: 0 10px;background: #0c0;}
#right { background: #0cf;}
</style>
</head>

<body>
<div >
 <div >header</div>
 <div >
  <div >left</div>
  <div >content</div>
  <div >right</div>
 </div>
</div>
</body>
</html>