How do you automate invoice numbers?

How do you set up automatic invoice numbers on the sale invoice template in
office XP

http://www.mcgimpsey.com/excel/udfs/sequentialnums.html

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Kind regards,

Niek Otten

"Kevan Roberts" <Kevan [email protected]> wrote in message
news:[email protected]...
> How do you set up automatic invoice numbers on the sale invoice template
> in
> office XP