大图片自适应居中显示，超出隐藏

<div style="width:100%; min-width:1000px; height:500px; position:relative; overflow:hidden;">
<div style="position:absolute; left:50%; margin-left:-960px; height:500px; width:1920px; overflow:hidden;">
<a target="_blank" href="http://dreamdesign.csrjgzs.com/Article/ShowArticle.asp?/1734-1.html"><img src="http://dreamdesign.105.idcxin.com/bbs/menber/yypz/2013年夏上传/CCTV-4《中华医药》2008-2012节目视频全集.jpg" /></a>
</div>
</div>