.poster-main{
	position: relative;
	margin:30px auto;
	max-width:500px;
	max-height:250px;
}
.poster-main .poster-list .poster-item{
	position: absolute;
	left: 0;
	top: 0;
	list-style:none;
}
.poster-item img{
	border-radius:5px;
}
.poster-main .poster-btn{
	position: absolute;
	top: 0;
	cursor: pointer;
}
.poster-main .poster-prev-btn{
	left: 0;
	background: url("../png/btn_l.png") no-repeat center center;
}
.poster-main .poster-next-btn{
	right: 0;
	background: url("../png/btn_r.png") no-repeat center center;
}