Javascript for Adobe Acrobat

Hi,

I have to use some Javascript code for a PDF file.

I am just starting learning Javascript but I don't have all the knowledge for now.

Here's my wish I would like : in the file we can see in Viewer Type: Adobe Acrobat.

If I want to rewrite a text in this place I have to delete "Adobe Acrobat" and then I can write an another.

But my wish is to click in this text "Adobe Acrobat" and when I click on it the text should disappear, and then I can rewrite on it.

If nothing is written in this part "Adobe Acrobat" should come back.

I don't know if my explication is good.

Thanks for your help.

Here's the link:

http://www.planetpdf.com/planetpdf/pdfs/ppjslc_commonex_1.pdf