废话不多说,直接上代码,大家自己看一下:

<!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 content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>Layout</title>
<style type="text/css">
*{
	margin:0;padding:0
}
.wrap
{
	overflow:auto; _display:inline-block; padding: 10px; overflow: hidden;
}
.right
{
	width: 200px;
	padding: 10px;
	background-color: #F4F4F4;
	border: 1px solid #CECECE;
	float: right;
}
.left
{
	padding: 10px;
	background-color: #F4F4F4;
	border: 1px solid #CECECE;
	margin-right: 230px;
}
</style>
</head>

<body>
	<div class="wrap">
	
		<div class="right">
			I'm 200px width.
		</div>
			
		<div class="left">
			I'm auto witdh.
		</div>
		
	</div>
</body>

</html>

 有图有真相: