Inserting a "paid "stamp

[Kicker3]

I need to insert a PAID gif. file into my invoice table when customer has paid. Can I do this with a container field & a script connected to the date paid field? To have it inserted right in the middle of the invoice at the time when paid, and not be there until it's paid? And how can I do it if its possible? Thank you

[Kicker3]

Never mind I figured it out. I put a container field on the invoice, scripted a button to insert an picture....... Worked and was simple....