#slideshow {
    z-index:40;
}
#slidetitle {
    position:absolute;
    top:15px;
    left:20px;
    z-index:50;
}
ul.ppt {
    position: relative;
}

.ppt li {
    list-style-type: none;
    position: absolute;
    top: 0;
    left: 0;
}

.ppt img {

}