.poster-main{
 width: 1000px;
 height: 500px;
 position: relative;
}
.poster-main a,.poster-main img{
 display:block;
}
.poster-main .poster-list{
 width: 1000px;
 height: 500px;
}
.poster-main .poster-list .poster-item{ 
 width: 200px;
 height: 500px;
 position:absolute;
 left:0;
 top:0;
}
.poster-main .poster-btn{ 
 position:absolute;
 top:0;
 z-index:10; 
 cursor:pointer;  
}
.poster-main .poster-prev-btn{
 left:0; 
 background: url(imagesleft.png) no-repeat center center;
}
.poster-main .poster-next-btn{
 right:0; 
 background: url(imagesright.png) no-repeat center center;
}

li,ul{list-style:none}