public static function getCalendarShortMonths($calendarId = 0) {
		if(!isset(self::$calendarShortMonths[$calendarId])) {
			$calendar_info = cal_info($calendarId);
			self::$calendarShortMonths[$calendarId] = $calendar_info['abbrevmonths'];
		}		
		return self::$calendarShortMonths[$calendarId];
	}