XUL Window with no Frame around?

[email protected]
Newsgroups gmane.comp.mozilla.devel.xpfe
Organization http://groups.google.com
Message-ID <[email protected]> 
https://developer.mozilla.org/en/XUL/window says:

"By default, the window will have a platform-specific frame around it."

Can i create a window in middle of screen with no (=null) such a Frame around it?

Background: Want to write an fast-do-something local app that shows window when alt+space pressed and hides when alt key unpressed - no need for border

regards, Nils
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