a.imgpop {
 height: 40px;
 width: 40px;
 }

a.imgpop, a.imgpop:visited {
 color: #000; 
 position: relative; 
 z-index: 1000;
 }

a.imgpop b {
 border: none; /* add a border */
 height: 0; /* no height to solve an Opera bug that 
             makes it selectable when hidden */
 left: 0; /* position:the image */
 position: absolute;
 top: 2px;
 visibility: hidden; /* hide the image */
 width: 200px; /* give it a width */
 }

a.imgpop:hover {
 border: 0; /* needed for this to work in IE */ 
 text-decoration: none;
 z-index: 1000;
 }

a.imgpop:hover b {
 cursor: pointer; /* for IE */
 height: 150px; /* now give it a height */
 visibility: visible; /* make the image visible */
 z-index: 500; 
 }

a.imgpop:hover b img {
 border: 0; /* remove the link border */
 }

/* 
<a class="imgpop" href="#">ADDRESS
<b><img src="IMAGELOCATION" alt="image"
title="image" /></b></a>
 */