public static function throwError($tag, $message)
        {
            if(self::$error_mode === self::ERROR_EXCEPTION && !$this->_buffer_in_use)
            {
                throw new CustomTagsException('<strong>'.$tag.'</strong> '.$message.'.');
            }
            else if(self::$error_mode !== self::ERROR_SILENT)
            {
                return '<strong>['.self::$name.' Error]</strong>: '.ucfirst($tag).' Tag - '.$message.'<br />';
            }
            return '';
        }