public static function GetAuthClass () {
		if (self::$authClass === NULL) {
			if (class_exists(self::AUTH_CLASS_FULL)) {
				self::$authClass = self::AUTH_CLASS_FULL;
			} else {
				self::$authClass = self::AUTH_CLASS_BASIC;
			}
		}
		return self::$authClass;
	}
public static function GetAuthClass () {
		if (self::$authClass === NULL) {
			if (class_exists(self::AUTH_CLASS_FULL)) {
				self::$authClass = self::AUTH_CLASS_FULL;
			} else {
				self::$authClass = self::AUTH_CLASS_BASIC;
			}
		}
		return self::$authClass;
	}
Return authentication module full class name.
@return string|NULL