/*** set the width and height to match your images **/
#slideshow
{
    position: relative;
    height: 328px;
}
#slideshow IMG
{
    position: absolute;
    top: 0;
    left: 0;
    z-index: 8;
    opacity: 0.0;
}
#slideshow IMG.active
{
    z-index: 10;
    opacity: 1.0;
}
#slideshow IMG.last-active
{
    z-index: 9;
}