These are the lines you should look at from that site's source.
------------------------------------------------
<style type="text/css">
#menu a.p1:hover {text-decoration:none; background-color:#8c97a3; color:#000;}
#menu a .large {display:block; position:absolute; width:0; height:0; border:0; top:0; left:0;}
#menu a.p1:hover .large {display:block; position:absolute; top:-65px; left:150px; width:300px; height:300px; border:10px solid #ccc;}
</style>
<div id="menu">
<a class="p1" href="#nogo" title="thumbnail image"><img src="../img/tdrips.jpg" title="Thumbnail image" alt="Thumbnail image" /><img class="large" src="../img/drips.jpg" title="Enlarged view of image" alt="Enlarged view of image" /></a>
</div>
------------------------------------------------
The trick is the hover command in CSS. The large image is initially set to 0 width and 0 height. When you mouseover the small image, it will trigger the last CSS rule that sets the large image to 300px width and 300px height. That's how you can see the large image when you mouseover the small image.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum