a.rollover img {display:inline; position:relative; z-index:1;} /* border-width:0px; */
a.rollover img.over {display:none;} 
a.rollover:hover {border:0px;} 
a.rollover:hover img {display:none; } 
a.rollover:hover img.over {display:inline; position:relative; z-index:2}