I'd like to remind subcribers that this is a plain-text mailing list. The reason is to accommodate low-bandwidth subscribers (i.e. slow dialup). I'm (painfully) aware that some contributors are forced to use non-text mailers, so we live with it. But please avoid the temptation to include attachments, binary files, pictures, and long program listings. Rich rcs@cs.arizona.edu Math-Fun moderator