#gallery {position:relative; width:750px;}
#top {width:180px; float:left;}
#top a {display:block; float:right; margin:0 0 5px 5px; width:50px; height:50px; border:1px solid #000;}
#top a img {width:50px; height:50px; border:0;}
#top a:hover {border-color:#ddd;}
#top a:hover img {position:absolute; width:auto; height:auto; left:185px; top:0; border:1px solid #333;}

#middle {width:180px; float:left;}
#middle a {display:block; float:right; margin:0 0 5px 5px; width:50px; height:50px; border:1px solid #000;}
#middle a img {width:50px; height:50px; border:0;}
#middle a:hover {border-color:#ddd;}
#middle a:hover img {position:absolute; width:auto; height:auto; left:185px; top:-100px; border:1px solid #333;}

#bottom {width:180px; float:left;}
#bottom a {display:block; float:right; margin:0 0 5px 5px; width:50px; height:50px; border:1px solid #000;}
#bottom a img {width:50px; height:50px; border:0;}
#bottom a:hover {border-color:#ddd;}
#bottom a:hover img {position:absolute; width:auto; height:auto; left:185px; top:-175px; border:1px solid #333;}