rem: return null; 
context:   QueryInterface : function(iid)    {    if(iid.equals(Components.interfaces.nsIXULBrowserWindow))      return this;    throw Components.results.NS_NOINTERFACE;    return null;    },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/5f432f1928b60f033360e2b15b4c9bbd16cbbcc2/mini-nav.js/clean/embedding/browser/chrome/content/mini-nav.js