rendering a dom tree

Iuri <[email protected]>
Newsgroups gmane.comp.mozilla.devel.dom
Organization http://groups.google.com
Message-ID <[email protected]> 
Hello,
I've searched the forums and newsgroups but I can't find how to do the
following.
I receive an http response and parse it with an xml parser, getting a
dom tree (or using .responseXML). How can I then ask the browser to
show this dom tree on the screen?
I am doing this from an extension.
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