#viewer {height:310px; width:480px; overflow:hidden; margin:0px 10px ; }
#viewerFrame {width:480px; clear:both; padding:0;}
#viewer img { margin:0px; display:inline; border:0;}
#viewer a {display:block; float:left; width:480px; height:310px; text-align:center;}
.leftBtn { float:left; width:16px; height:16px; margin-top:147px; cursor:pointer; }
.rightBtn { float:right; width:16px; height:16px;  margin-top:147px; cursor:pointer; }