In rely to:
The layout appears to rely on using CSS positioning in such a way that the "body" section ends up overlapping the "navigation" section, thus elements in the "navigation" section will never receive mouse events.
Applying relative positioning to "body_layer" appears to be the cause of the problem.
Oh, wait a minute! So a little experimentation showed me what you were talking about, basically it appears I was "coloring outside the lines"... Maybe I'll slowly start comprehending all this techy speak after all.
Now if I can just figure out how to give my "body_layer" lines some height in iWeb, I'll be golden. Thanks for replying, though I might be back...