Referring to the Picture Gallery tutorial

hi,
how do you get the picture to be linked to a url when you click on it. from the downloaded xml document, it looks like simply adding the url between <link> but tt doesnt seem to work. i browse throught the actionscript on the source file, but didnt find anything about hyperlinking the image to a url.

<pic>
<image>http://www.kirupa.com/developer/mx2004/pg/construction.jpg</image>
<caption>Construction</caption>
<thumbnail>http://www.kirupa.com/developer/mx2004/pg/construction_sm.jpg</thumbnail>
<link>http://web.mit.edu/evolving/projects/cogsci/index.html</link>
</pic>