.labimages, .labimages:after {
    position: relative;
    width: 698px;
    height: 234px;
    top: 0px;
    left: 0px;
    z-index: 0;
}
.labimages:after {
    content: '';
}
.labimages li{
    list-style: none;
}
.labimages li span {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    color: transparent;
    background-size: contain;
    background-position: 50% 50%;
    background-repeat: no-repeat;
    opacity: 0;
    z-index: 0;
    animation: imageAnimation 36s linear infinite 0s;
}

.labimages li:nth-child(1) span{
    background-image: url(image/research1.jpeg);
}
.labimages li:nth-child(2) span{
    background-image: url(image/slideshow04.jpg);
    animation-delay: 6s;
}
.labimages li:nth-child(3) span{
    background-image: url(image/slideshow03.jpg);
    animation-delay: 12s;
}
.labimages li:nth-child(4) span{
    background-image: url(image/slideshow02.jpg);
    animation-delay: 18s;
}
.labimages li:nth-child(5) span{
    background-image: url(image/slideshow01.jpg);
    animation-delay: 24s;
}
.labimages li:nth-child(6) span{
    background-image: url(image/slideshow05_1.jpg);
    animation-delay: 30s;
}


@keyframes imageAnimation {
    0% { opacity: 0; animation-timing-function: ease-in; }
    5% { opacity: 1; animation-timing-function: ease-out; }
    20% { opacity: 1; }
    25%, 50% { opacity: 0; }
    100% { opacity: 0; }
}