[Air-L] Looking for correct term

All, I once heard of a slang/technical term for those irritating animated pop-up ads that run at the bottom of the TV screen during programs (love the Simpsons episode when Marge sprays them with bug killer and they die heh-heh-heh) but now I can't find it. Anyone know? -TED Ted M. Coopman Department of Communication University of Washington