Javascript checking document use.

I have created a form using Acrobat 7 Pro, Several people in the company need to add information over a period. The problem is that they often open the document, fill in their info (sometimes a substantial amount of typing). Then when they go to save the document they get an error because someone else is also using the document (as you can imagine an arguement follows as to who will loose their info). So is there any javascript, that can when the document is opened check to see if it it already open elsewhere, and if so throw an error, perhaps also telling who else has the document open.
Any help would be greatly appreciated.
Kind regards,
Andrew Evans.