Science fair project http://www.stuff.co.nz/stuff/0,2106,3389136a28,00.html Good enough to win him a 3 years university fees scholarship. Suspect enough from what was written to want more information. The poorness of the technical content in the article does not necessarily reflect the technical quality of the method. RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist