Code
<html>
<head><style type="text/css">
img.expando{ /*sample CSS for expando images. Not required but recommended*/
border: none;
vertical-align: top; /*top aligns image, so mouse has less of a change of moving out of image while image is expanding*/
}
</style>
<script type="text/javascript" src="expando.js">
</script>
</head>
<body>
<p>
<img class="expando" border="0" src="amster2.jpg" width="100" height="75">
<img class="expando vacation" border="0" src="amster3.jpg" width="100" height="66">
<img class="expando" border="0" src="amster4.jpg" width="100" height="75">
</p>
<p>
<img class="expando cat" border="0" src="cat.png" width="200" height="88">
</p>
</body>
</html>