.slider {
    position: relative;
}

.sliderbox {
    position: relative;
}
/*必须加这句css,否则向左右，上下滚动时会没有效果*/


@media screen and (-webkit-min-device-antio:0) {
    .slidernav {
        letter-spacing: -5px;
    }
}

.slider .prev, .slider .next {
    position: absolute;
    top: 50%;
    margin-top: -30px;
    cursor: pointer;
    width: 61px;
    height: 61px;
    left: 0;
    background: url(images/ft_icons.png) 0 0 no-repeat;
    text-indent: -9999px;
}

.slider .next {
    right: 0;
    left: auto;
    background-position: 0 -61px;
}