function addImage()
    {
        $args = func_get_args();
        $argc = func_num_args();

        if ($this->_addImage($argc, $args))
        {
            return true;
        }
        else
        {
            //trigger_error($this->_error_prefix . 'failed to add image.', E_USER_ERROR);
            return false;
        }
    }