MySQL DELIMITER 语法错误

It works on one machine running MySQL 5.0.51b-community. On another machine running MySQL 14.12 Distrib 5.0.45, for redhat-linux-gnu (i386) it fails, with this error message, which seems to be related to the DELIMITER // ... // DELIMITER; syntax :

第 272 行的 ERROR 1064 (42000):您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以获取在DELIMITER"附近使用的正确语法；DROP TRIGGER IF EXISTS trigger_name;DELIMITER' 在第 1 行

脚本语法(总结)是:

DROP TRIGGER IF EXISTS trigger_name;
DELIMITER //
CREATE TRIGGER trigger_name BEFORE UPDATE ON table
FOR EACH ROW BEGIN
  -- Trigger logic goes here
END //
DELIMITER;

-- More trigger drop/create statements follow

脚本有什么问题，我该如何纠正?

DELIMITER ;

DELIMITER;