Start with describing the problem. "Links don't work" is not very helpful. What steps are necessary to repeat the problem? What is it you expect the browser to do exactly?
If you meant to say something like "Nothing happens when I move the mouse cursor over the images or when I click on the images" then I can help.
Just like you can't write on a piece of paper beneath a piece of glass, an anchor element will not capture mouse events when another element is positioned on top of it. No doubt you have read this section of the CSS specification before on positioning.
If you're no longer using iWeb, it might be best to re-write the HTML for the site to avoid relying on absolute positioning.