.img_nav {position: relative; width: 1002px; float: left; height: 320px}
.big_img a {position: absolute; top: 0px; left: 0px}
.img_nav img {width: 1002px; height: 320px;border:0px;}
.link_nav { position: absolute; filter: alpha(opacity=50); width: 1002px; bottom: 11px; height: 32px; opacity: 0.5 }
.link_nav a {position: absolute; line-height: 0px; color:red; left: 5px}
.num_nav { position: absolute; bottom: 17px; right: 19px }
.num_nav span { line-height: 18px; width: 15px;float: left; height: 15px; color: #fff; font-size: 14px; font-weight:bold; cursor: pointer;  margin-right: 4px; }	
.num_nav span.selected{ color:#F00;}