#lightbox{ position:absolute;top:0;left:50%;width:500px;margin-left:-250px;background:#fff;z-index:1001;display:none} #lightbox-shadow{ position:absolute;top:0;left:0;width:100%;height:100%;background:#000;filter:alpha(opacity=75);-moz-opacity:0.75;-khtml-opacity:0.75;opacity:0.75;z-index:1000;display:none}