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Just a note of apology for the double posting - I am using a new news program on a new provider and wasn't sure ifd the first one got through. Again apologies. But thanks to all who replied - muxh of that info was very hellpful! -- Harry A. Smith Professor of Biological Sciences Tallahassee Community College hasmith at garnet.acns.fsu.edu "If you're not simulating, you're not stimulating!"