Adding links on "Adding Thumbnails" tutorial

I’ve stumbled across a very interesting tutorial, which helped me a lot.
http://www.kirupa.com/developer/mx2004/thumbnails.htm
But, I’ve noticed a little detail. When you click on the big image of the finished example on the first page of tutorial, it acts like a link. When I have downloaded finished .fla source, links are nicely written in the images.xml file, but the links in the .fla file don’t work.
Please, tell me which AS code I have to add to my .fla file in order to activate links (and make them work properly).
Thanks.