<a class="thumbnail" href="#"><img src="qui mettete l immagine piccola" width="la larghezza px" height="l altezzapx" border="0"><span><img src="qui invece mettete quella a formato normale">Grado: admin,mod o altro<br>Nick: il nome</span></a>

/*Credits: Dynamic Drive CSS Library */
/*URL: http://www.dynamicdrive.com/style/ */

.thumbnail {position: relative;
z-index: 0}

.thumbnail:hover {background-color: white;
z-index: 9}

.thumbnail span {/*CSS for enlarged image*/
position: absolute;
background-color: #550080;
padding: 5px;
left: -1000px;
border: 1 dashed gray;
visibility: hidden;
color: black;
text-decoration: underline}

.thumbnail span img {/*CSS for enlarged image*/
border-width: 0;
padding: 2px}

.thumbnail:hover span {/*CSS for enlarged image on hover*/
visibility: visible;
top: 0;
left: 60px}