docs: function () {
              if (this._enableIEpolling) {
                  this._hashPollCallback = ariaCoreTimer.addCallback({
                      fn : this._hashPoll,
                      scope : this,
                      delay : this.ie7PollDelay
                  });
  
                  var documentHash = this.getHashString();
  
                  var iframeHash = this.polledIframeHashString;
  
                  // back or forward
                  if (iframeHash != this._currentIframeHashString) {
                      this._currentIframeHashString = iframeHash;
                      this._currentHashString = iframeHash;
                      this.setHash(iframeHash);
                      this._internalCallback();
                  } else if (documentHash != this._currentHashString) {// no back or forward
                      this._addIframeHistoryEntry(documentHash);
                      this._internalCallback();
                  }
              }
          }