Karl Schultz (kschultz@researchsystems.com) writes: > This is tricky but you *could* do it... I just remembered the reason I didn't go into computer science. :-( Cheers, David -- David Fanning, Ph.D. Fanning Software Consulting Phone: 970-221-0438 E-Mail: davidf@dfanning.com Coyote's Guide to IDL Programming: http://www.dfanning.com/ Toll-Free IDL Book Orders: 1-888-461-0155