javascript scope between browsers

Hi

I am puzzled by javascript scope within greasemonkey/firefox
extensions.

In normal web app, I can open a window (wdw =
window.open(...) and then 
within the parent call the child using wdw.someFunction() or
within the 
child execute a function in the parent using
window.opener.someFunction.

Within a greasemonkey script or firefox extension, I want to
open a window 
and then make calls from parent and child to functions
within the extension. 
The standard web technique does not work - I guess because
the functions are 
not in the scope of the window but of the browser.

Is there any way around this?

James 

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