Sapete dirmi il codice?

<style type="text/css">.thumbnail {position: relative;
z-index: 0}

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

.thumbnail span {/*CSS for enlarged image*/
position: absolute;
background-color: darkgrey;
padding: 5px;
left: -1000px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none}

.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}</style>
<br>

<a class="thumbnail" href="LINK PROFILO"><img src="LINK PRIMA IMMAGINE (PICCOLA)" width="20px" height="20px" ><span><img src="LINK SECONDA IMMAGINE (GRANDE)"><br>Nickname</span></a>

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

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

.thumbnail span {position: absolute;
background-color: white;
padding: 5px;
left: -1000px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none}

.thumbnail span img {border-width: 0;
padding: 2px}

.thumbnail:hover span {visibility: visible;
top: 0;
left: 60px}

<a class="thumbnail" href="?act=Profile&MID=1350105"><img src=IMMAGINE PICCOLA><span><img src="IMMAGINE GRANDE">
<br>
<p align="center"><font color=#247cff><b> Come utente </b>
<br>
<b>~ Founder </b></font></p>
</span></a>