#header_slide_show {
    position:relative;
    width: 258px;
    height:233px;
    text-align:center;
}
#header_slide_show img {
    position:absolute;
    top:0;
    left:0;
    z-index:8;
}
#header_slide_show img.active {
    z-index:10;
}
#header_slide_show img.last-active {
    z-index:9;
}