.img_nav {position: relative; width: 992px; float: left; height: 285px;}
.big_img a {position: absolute; top: 0px; left: 0px}
.img_nav img {width: 992px; height: 285px}
.link_nav {position: absolute; filter: alpha(opacity=50); width: 679px; bottom: 0px;  height: 32px; opacity: 0.5}
.link_nav a {position: absolute; line-height: 32px; color: #fff; left: 5px}
.num_nav {position: absolute; bottom: 7px; right: 2px}
.num_nav span {border-bottom: #ff7300 1px solid; text-align: center; border-left: #ff7300 1px solid; line-height: 18px; width: 18px; background: #fff; float: left; height: 18px; color: #ff7300; font-size: 14px; border-top: #ff7300 1px solid; cursor: pointer; font-weight: bold; margin-right: 4px; border-right: #ff7300 1px solid}
.num_nav span.selected {border-bottom: #ff7300 1px solid; border-left: #ff7300 1px solid; background: #ff7300; border-top: #ff7300 1px solid; border-right: #ff7300 1px solid; color:#fff;}