[pete_brady]

thanks for this hack - I installed it yesterday, so far no spam signups. one question - is there a log kept anywhere of failed attempts?

regarding whether it can be cracked or not - sure, it probably can. But the object of the exercise is to defeat automated software, so perhaps introducing more randomness is what's needed rather than any one approach. For example, sometimes you ask for an image to be identified, sometimes you ask a simple arithmetic question, sometimes you need a picture clicked on... introducing more random aspects like this would make it increasingly difficult to program a bot for. I think.