body {text-align:center; border:0px; padding:0px;overflow-x:hidden; overflow-y:hidden;}
.main_div {margin:0 auto; width:798px; height:478px; border:1px solid #000; background:url(background.jpg) }
.back_div {position:absolute; top:56px; left:56px; width:142px; height:36px; background:url(return.png)}
.last_div {position:absolute; top:187px; left:20px; width:35px; height:142px; background:url(last.png)}
.next_div {position:absolute; top:187px; right:20px; width:35px; height:142px; background:url(next.png)}