IE6兼容图片和fixed

/*ie6 hack*/

         * html, * html body {

             background-image: url(about:blank);

             background-attachment: fixed;

         }



         * html #menu {

             /*position: fixed;*/

            position: absolute;

             top:expression(((e=document.document.scrollTop)?e:document.body.scrollTop)+100+"px");

         }