css 背景图片随分辨率自动拉伸

<style type="text/css">
    html, body
    {
        filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src=  'extresour/images/desk.jpg' ,sizingMethod= 'scale' );
        background-repeat: no-repeat;
        background-positon: 100%, 100%;
        font: normal 12px tahoma, arial, verdana, sans-serif;
        margin: 0;
        padding: 0;
        border: 0 none;
        overflow: hidden;
       
    }
</style>