Acting on Doc.open and doc.close events in doc level javascript

Hi,
 
I read up on how to add doc level javascripts using acrobat and adding specific javascript for specifc actions. but I need to add the same javascript to a batch of files. Right now, Im planning to do this with itext. how do I write the code for the document open and close events in javascript (i.e without using acrobat) that I can just add to a batch of documents? also, I want to disable the save as dialog box that appears when the user closes the pdf(since the pdf contains a form which i dont need the user to save anyway). Will disabling this also prevent saving of any global environement variables set?