.sm {list-style:none; width:840px; height:242px; display:block; overflow:hidden; margin: 0 auto; padding: 0;}
.sm li {float:left; display:inline; overflow:hidden}
div#index_slider{
	width: 870px;
	height: 270px;
	position: relative;
	margin: 0 auto;
	padding-top: 28px;
	background: url(img/css/index_back_baner.png) no-repeat center center;
}
div#slider_overflow_left{
	background: url(img/css/index_back_baner.png) no-repeat -16px 0px;
	width: 5px;
	height: 270px;
	position: absolute;
	top: 14px;
	left: 15px;
}
div#slider_overflow_right{
	background: url(img/css/index_back_baner.png) no-repeat -850px 0;
	width: 5px;
	height: 270px;
	position: absolute;
	top: 14px;
	right: 15px;
}