.banner{margin:0 auto 0;width:537px;overflow:hidden;}
.large_box{margin-bottom:10px;width:537px;height:329px;overflow:hidden;}
.large_box img{display:block;}
.small_box{width:537px;height:67px;overflow:hidden;}
.small_list{position:relative;float:left;width:480px;height:67px;overflow:hidden;}
.small_list ul{height:67px;overflow:hidden;}
.small_list ul li{position:relative;float:left;margin-right:10px;width:110px;}
.small_list ul li img{display:block;}
.small_list ul li .bun_bg{display:none;position:absolute;top:0;left:0;width:110px;height:67px;background:#000;filter:alpha(opacity=60);-moz-opacity:0.6;-khtml-opacity:0.6;opacity:0.6;}
.small_list ul li.on .bun_bg{display:block;}
.btn{display:block;width:20px;height:67px;background-repeat:no-repeat;background-position:center center;cursor:pointer;}
.left_btn{float:left;margin-right:10px;background-image:url(../images/left_btn.png);}
.right_btn{float:right;background-image:url(../images/right_btn.png);}