Adobe Acrobat 7 Professional - Manual (Page 702)

About JavaScript in Acrobat
In Acrobat Professional, you can use the Adobe-enhanced JavaScript in your PDF
documents to perform calculations, respond to user actions, validate user data, process
multiple PDF documents in batch sequences, and control the behavior of the document.
You can add life to your PDF documents by invoking JavaScript when a user opens or
closes a page or a file, clicks a bookmark or link, or enters data in a form field. (See
Using
actions for special effects .)