Adding Thumbnails Tutorial

Hey everyone, I’m working on the Adding Thumbnails tutorial (http://www.kirupa.com/developer/mx2004/thumbnails.htm). It works great except I can’t get the main image to link to a larger image or site. I thought that’s what the <link></link> tags in the images.xml coding was for, because on the tutorial page the example they have links to the same urls. However, after even downloading their source file, it’s not possible to click on the image. Any ideas? Help would be appreciated.