I am now contemplating my code.
You can try removing the documentElement piece from the code and try. Therefore the code would look like this:
js code:
Debug.Trace ( xmldom.selectSingleNode ( '//statuses/status/text' ).text );
instead of this:
js code:
Debug.Trace ( xmldom.documentElement.selectSingleNode ( '//statuses/status/text' ).text );