code: function _updateIFrame (fqstate) {
  
          var html, doc;
  
          html = '<html><body><div id="state">' +
                     fqstate.replace(/&/g,'&amp;').
                             replace(/</g,'&lt;').
                             replace(/>/g,'&gt;').
                             replace(/"/g,'&quot;') +
                 '</div></body></html>';
  
          try {
              doc = _histFrame.contentWindow.document;
              doc.open();
              doc.write(html);
              doc.close();
              return true;
          } catch (e) {
              return false;
          }
      }
docs: Update the IFrame with our new state.
  
  @method _updateIFrame
  @private
  @return {boolean} true if successful. false otherwise.