Automatic Number Generation When Opening an Acrobat Form

Hello,

I've created a PDF Job Ticket Form with several input fields using Acrobat Pro, now I would like to have this form automatically generate a sequencial number on each page of the form everytime it opens. This number would serve as a Job Number or an Invoice Number so it would need to be unique everytime it was generated.

I would assume this would be a simple script that could grab the previous job number and increase the value by one, but I'm am unsure how/where to save the previous job number in the form so that the number/field can be incremented sequencially each time it opens?

If this is possible I would greatly appreciate any help you can provide.

Thanks in advance!