it's an advertisement. With the money Crystal Guides makes from this sort of thing, they fund AnswerBank. No ads, no AB. You just have to learn to deal with it, as you do with ads on TV or in magazines.
i am having the same problem, but not just the tesco ad, everytime i post an answer i get pop ups!!!!!!!!!!sooooo frustrating, and i thought i'd take the advice given and download the google pop up blocker, and guess what? STILL getting flamin pop ups and now i've landed another task bar too..........oh i give up x
right just checked and its on.........well as opposed to it saying 'pop-ups ok' i clicked pop-ups blocked'...........and promptly got a pop up??????????? so boll**ks to it, i'm off out for a chinese buffet ;- P