If you ever need to eat the humble pie go to http://www.micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/index Enjoy it ! Jorge --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.377 / Virus Database: 211 - Release Date: 15/07/02