Javascript in PDFs

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G'day Folks,

Looking back through the archives there's really only been one person 
that's mentioned changing data in a PDF using Javascript.

Has anyone else meddled with Javascript inside a PDF? Especially using 
API2?

I've read the reference, but it's fairly light on the topic.

I'd like to use JS to show/hide some 'elements' and then populate the 
data in those elements based on what was clicked on. (It can be done, 
I've seen commercial apps that can do it).

Cheers!
Rick Measham

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