Triggers in mysql

Hello techies,
Iam very new to mysql server.
Iam using mysql server 5.0.4 beta version.
I am trying to work on trigger in mysql server.
My trigger is .
CREATE TABLE account (acct_num INT, amount DECIMAL(10,2));
CREATE TRIGGER ins_sum BEFORE INSERT ON account
FOR EACH ROW SET @sum = @sum + NEW.amount;
SET @sum = 0;
INSERT INTO account VALUES(137,14.98),(141,1937.50),(97,-100.00);
when i try to insert some values into account table, it is saying the memory cant be read.
Now the server is closing i.e the server is down.
can any body tell me what is the reason.
thanks(in advance),
ramu.

yes , mysql server5.0.4 supports triggers
U can see the artical in the following link
http://mysql.digipedia.pl/mysql/en/using-triggers.html
regards,
ramu

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