Hi, Is it possible to have a slot to which any arbitrary class can be assigned? /E Dipl. bio-chem. Witold Eryk Wolski @ MPI-Moleculare Genetic Ihnestrasse 63-73 14195 Berlin 'v' tel: 0049-30-83875219 / \ mail: witek96 at users.sourceforge.net ---W-W---- http://www.molgen.mpg.de/~wolski wolski at molgen.mpg.de