div#background{position:fixed;height:100%;width:100%;overflow:hidden;z-index:1;top:0}div#background div{background-color:transparent;position:absolute;top:0;left:0;z-index:8;opacity:.0;display:none}div#background div.active{z-index:10;opacity:1.0}div#background div.last-active{z-index:9}div#background div img{display:block;border:0}