/*** set the width and height to match your images **/

#top_banner {
    position:relative;
    height:257px;
	
}

#top_banner IMG {
    position:absolute;
    top:0;
    left:0;
    z-index:7;
    opacity:0.0;
}

#top_banner IMG.active {
    z-index:10;
    opacity:1.0;
}

#top_banner IMG.last-active {
    z-index:9;
}