ul {list-style: none; margin:0px; padding:0px;}
.hidden{display:none;}

#banner{position:absolute; top:0px; left:0px; width:640px; height:399px; marginwidth:0px; marginheight:0px;}
#banner .img_list{position:absolute; top:0px; left:0px; z-index:200;}
#banner .img_list img{position:absolute; top:0px; left:0px;}
#banner .btn_list{position:absolute; float:right; bottom:10px; right:5px; z-index:300;}
#banner .btn_list li{float:left; margin-right:7px;}