if you're running the free version of Avast5, you don't have the script shield. If you got "pro" or AIS, then you got the script shield but basically the only browser that works with it is IE. Neither Chrome nor Firefox do. Anyway, I fear your issue isn't avast related, ie I can't see how Avast could do that...There's a new javascript option in Chrome (may be just in the dev version, 5.0) see what you can do there. As to IE, see if scripting is enabled.