code: public static function addToUrl($strRequest, $blnAddRef=true, $arrUnset=array())
  	{
  		// Unset the "no back button" flag
  		$arrUnset[] = 'nb';
  
  		return parent::addToUrl($strRequest . (($strRequest != '') ? '&amp;' : '') . 'rt=' . REQUEST_TOKEN, $blnAddRef, $arrUnset);
  	}
docs: Add the request token to the URL
  
  @param string  $strRequest
  @param boolean $blnAddRef
  @param array   $arrUnset
  
  @return string