Hello all, Thank you for your help. The problem has been fixed (and so promptly!) All the best, F?tima _______ F?tima N??ez, PhD Centre for Cancer Research (CIC) University of Salamanca-CSIC Campus Unamuno 37007 Salamanca?????????????????????????????????????????????????? Spain Phone: + 34 923 294802 Fax:?????+ 34 923 294743 E-mail: fnunez@usal.es