Well done Map for justifying my faith in you!
I don't ask many questions, but when I do it is usually when I have to go out or have other pressing things to do, so don't have time to continue working out the answer for myself. Inevitably this means that it may be some time before I can come back and say 'thank you'. So I undestand only too well the difficulties some people have in expressing their gratitude straightaway.
Anyway, congratulations Jan on your answer. I don't think I ever would have got that. Map must be pleased with your help.