Hi Geoff, thanks for the quick reply, I really appreciate your help. :)
Yeah, pesky iFrame! Pretty lame.
A friend of mine is using a DHTML dropdown menu with adsense below... When Google displays a Flash advert, his menu goes funky.
At first, I thought the Flash was the main prob, but now I am thinking it is an iFrame prob. Not sure how to get the Adsense Flash ads to display below the dhtml dropdowns. :(