auto numbering an exel work book sheet everytime it opens or print

I have a temporay invoice template, I need an invoice number to appear in one
cell, that automatically changes if the invoice is opened or printed.

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


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Regards Ron de Bruin
http://www.rondebruin.nl


"Rugby Al" <[email protected]> wrote in message news:[email protected]...
>I have a temporay invoice template, I need an invoice number to appear in one
> cell, that automatically changes if the invoice is opened or printed.