Adobe Contribute And Popup Windows / Lightbox Feature

I have a client which would like to use Adobe Contribute to maintain their website, and the website requires popup windows (for larger images) or a lightbox feature. The problem is how do I make images popup into new windows, without toolbars, etc. I would prefer lightbox than popup windows, if possible. How I can do this, so the client can add more images, as they maintain their website? For anyone that hasn't used Contribute, you can only edit <a href="page.htm"> and nothing else for the links, so it means onclick can't be added to <a href="page.htm">. The only way to add a link is to click on a button in the tools.