#main{width:100%;height:auto;overflow:hidden;position:relative;margin:0px auto;}
#main .box{width:100%;height:520px;box-shadow:0px 0px 5px #ddd;margin:0px auto;overflow:hidden;position:relative;}
#main .box img{width:100%;height:520px;position:absolute;left:0px;top:0px;opacity:0;filter:alpha(opacity=0); cursor:pointer;}
#main .banner_tu{  position:absolute; width:470px; height:230px; top:95px; z-index:1;left:50%; margin-left:-235px; }
#main .page_bn{width:300px;height:22px;position:absolute;bottom:15px; left:50%; margin-left:-150px;    text-align: center;}
#main .page_bn ul { display:inline-block;}
#main .page_bn ul a{display:inline-block;width:12px;height:12px; border-radius:12px; background-color:#646577;margin:0px 11px;float:left;color:#FFF;text-decoration:none;text-align:center;}
#main  .page_bn ul a.active{background-color:#0076cd;}