//若min-width:1000px;

*html .ie6_out{ margin-left:1000px;zoom:1;}
*html .ie6_in{ position:relative; float:left; margin-left:-1000px;}

<body>

<!--[if lte IE 6]>
<div class = "ie6_out">
<div class = "ie6_in">
<![endif]-->

    body内容

<!--[if lte IE 6]>
</div>
</div>
<![endif]-->