If you're running Firefox, you can block it using AdBlocker. Click the 'block' tab on the ad, then when the preferences box comes up with the URL highlight, replace the five-digit number at the end with * before clicking OK. That gets rid of it on all pages.
I've worked it out - thanks ! There was no little block tab until I went into Firefox Tools, AdblockPlus, and changed the numbers at the end of the AnswerBank .... string to *, then applied the changes. Then I could see a little block tab !