Adding page actions by javascript

Hi,

I know that acrobat holds the option to add "open/close page event", it can be done manually, like in this guide: http://acrobatusers.com/tutorials/print/entering-page-actions

but i want something else, i want to know if there is a JavaScript command that adds a script to a page event, something like:

this.addScipt(page=2,

                    event=onClose,

                    "app.alert("Page 2 was closed")"

                    )

Thanks.