Alastair: >> Hopefully this fixes the problem. Oliver Braun <obraun@informatik.unibw-muenchen.de>: > Unfortunately not. Still the same error. Oh well, I'll need to think about this a bit harder. -- Alastair Reid alastair@reid-consulting-uk.ltd.uk Reid Consulting (UK) Limited http://www.reid-consulting-uk.ltd.uk/alastair/