.banner_main{ width:1003px; margin:0 auto;}
.banner_control{ float:left; width:1003px; height:400px; position:absolute;}
.banner_control .btn{ position:absolute; bottom:20px; right:480px; z-index:100;}
.banner_control .btn_point_on{float:left;width:10px;height:10px; background-image: url(../images/btn_off.gif);background-repeat: no-repeat;margin-right:15px; line-height:1px;}
.banner_control .btn_point_off{float:left;width:10px;height:10px; background-image:url(../images/btn_on.gif);background-repeat: no-repeat;margin-right:15px;cursor:pointer; line-height:1px;}
.banner1{width:100%;height: 400px;background-position: 49% center;background: url(../images/banner1.jpg);background-repeat: no-repeat;background-position: center center;}
.banner2{width:100%;height: 400px;background: url(../images/banner2.jpg) no-repeat center;background-position: center center;}
.banner3{width:100%;height: 400px;background: url(../images/banner3.jpg) no-repeat center;background-position: center center;}