fyi http://www.segfault.org/story.phtml?mode=2&id=39897e26-060c53e0 Mr. James W. Sandoz, Instructor, UMBC Dept of Biol Sciences, 1000 Hilltop Circle Catonsville, MD 21250 voice: (410) 455-3497; fax: 455-3875; net: sandoz at umbc.edu