I spent a great deal of today working on this.
Yes I understand your code and how it works, I would not implement code that I don't understand as like you say I wouldn't be able to maintain it.

I now have the code working as I want but only without the option explicit being used. When I use this I am having difficulty in defining the user defined fields that you created (and I will probably rename these to something more meaningful to me).
Can you point me in the right direction, either books or websites to show you how to do this?
Thanks again
Liz