thanks to Simon Forman, his solution worked, the key value pairs were entered the wrong way round in the dictionary...Doh!
-- Dr. Alistair King Research Chemist, Laboratory of Organic Chemistry, Department of Chemistry, Faculty of Science P.O. Box 55 (A.I. Virtasen aukio 1) FIN-00014 University of Helsinki Tel. +358 9 191 50429, Mobile +358 (0)50 5279446 Fax +358 9 191 50366 -- http://mail.python.org/mailman/listinfo/python-list
