.thumbnail {
position:relative;
z-index:1;
}
.thumbnail:hover {
background-color:transparent;
z-index:100;
}
.thumbnail span {
background-color:#FFFFFF;
border:1px dashed gray;
color:black;
left:-1000px;
padding:4px;
position:absolute;
text-decoration:none;
visibility:hidden;
}
.thumbnail span img {
border-width:0;
padding:2px;
}
.thumbnail:hover span {
left:0;
top:0;
visibility:visible;
}