Reen Brust writes: Oh, I see. Thanks. I was thinking someone had come up with something clever. Sigh. Well, I very much doubt that anyone's tried that receipe, since sorcery is required to make the filter. I would suppose that technology could be substituted successfully but I very much doubt that anyone who happens to own the technology also has an interest. I think that you are grievously underestimating the motivation of geeks with technology. rone -- "Alan Alda's all we are." - Kurt Cobain