Interesting, kat, but it doesn't answer yet my question.

By the way, which GUEST have you thanked for which argument? You can't have possibly meant GUEST 22-Nov-01 - 11:18 AM. (S)he should know better than to use such a stupid argument. People should be able to explain expressions or arguments they use and not be judged by their ability or inability to explain concepts they have not talked about.

Wolfgang