[Greasemonkey] gm_httprequest (sp?) and parsing html files

[s g]

the gm_httprequest function returns the html page
  as a string...right?
   
  can this be parsed into a dom tree?
   
  i'd like to traverse it using the evaluate() function on
  a normally downloaded html file
   
  e.g. 
   var xpath_result = document.evaluate("id('name')", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null );
   if ( xpath_result != null && xpath_result.singleNodeValue != null )
    {
     }
   
  
is this possible.
   
  if not, how can it be done.
   
  thx
   

 		
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