Valerieb - don't know if its right but a brilliant and inventive solution. Thanks for the help - so nice when people actually try and answer the request for help. Best regards
Wilbo- please don't think no-one has been trying to help you! I answered one for your ditloids late last night and (how sad I know) lay in bed trying to work this one out for you. I've also done various searches. I'm sure I'm not the only one who was trying to help.
Sometimes you need to wait a few days