Roy
I'll take another look at the code later.
But I have to correct what I said earlier. The if statement with the boundaries DOES compile but I still feel it won't do what you want it to do. I'll post some ideas on it later (got to go out).
Just to understand what you're saying about an earlier version. Before you added the boundaries, the program worked. Now it doesn't even if you remove the boundary code?
Can you post the version which used to work?
All the best
Ray