#main_slide_1 {
    position:relative;
    width: 195px;
    height:147px;
    text-align:center;
}
#main_slide_1 img {
    position:absolute;
    top:0;
    left:0;
    z-index:8;
}
#main_slide_1 img.active {
    z-index:10;
}
#main_slide_1 img.last-active {
    z-index:9;
}