img.mini {border:none}
div#minis a img.big {height: 0; width: 0; border-width: 0}
div#minis a:hover img.big {position:absolute;top:50px;left:375px;height:375px;width:500px;border:none; text-decoration:none;}
div#minis a img.mini {height: 75px; width: 75px; border-width: 0}

#img_present img
{
max-width:100%; 
max-height:100%;
height:100%;
margin:auto;
display:block;
}