Many thanks, I'll give all that a look... Pete -- Peter N. Spotts | Science reporter The Christian Science Monitor One Norway Street, Boston, MA 02115 USA Office: 617-450-2449 | Office-in-home: 508-520-3139 Email: pspotts at alum.mit.edu | Amateur radio call: KC1JB www.csmonitor.com | www.peterspotts.net