.poster-main{ position:relative;width:1000px;height:270px;}
.poster-main a,.poster-main img{display:block;}
.poster-main .poster-list{width:1000px;height:270px;}
.poster-main .poster-list .poster-item{ position:absolute;left:0;top:0;}
.poster-main .poster-btn{ position:absolute;top:0;width:200px;height:270px; z-index:10; cursor:pointer;  opacity:0.2}
.poster-main .poster-prev-btn{left:0; background: url(../images/btn_l.png) no-repeat center center;}
.poster-main .poster-next-btn{right:0; background: url(../images/btn_r.png) no-repeat center center;}