#slideshow {
    position: absolute;
    top:0px;
    left:0px;
    width: 1000px;
    height: 422px;
    overflow: hidden;
    z-index:1;
}
#slideshow img {
    position: absolute;
    display:none;
    left: 0;
    top: 0;
    z-index:-2;
}