Disable Trigger Syntax?

Code Snippet
CREATE PROCEDURE Staff_NoteGroup_insert
(

@staffID AS int,
@owner AS int,
@subject AS varchar(256),
@message AS varchar(512),
@date_add AS DateTime
)
AS
BEGIN TRANSACTION SERIALIZABLE

DECLARE @id as int
SELECT @id = (SELECT MAX(id) FROM Staff_NoteGroup) + 1

IF @id IS NULL

SET @id = 1

INSERT INTO Staff_NoteGroup VALUES(@id, @staffID, @owner, @subject, GETDATE(), GETDATE())

IF @@error <> 0 BEGIN

ROLLBACK
RETURN
END

DISABLE TRIGGER Staff_Note_insert ON DATABASE
INSERT INTO Staff_Note VALUES(1, @id, @owner, @message, @date_add)
ENABLE TRIGGER Staff_Note_insert ON DATABASE

IF @@error <> 0 BEGIN

ROLLBACK
RETURN
END
COMMIT
GO






Below is the error message.


Msg 156, Level 15, State 1, Procedure Staff_NoteGroup_insert, Line 26

Incorrect syntax near the keyword 'TRIGGER'.

Msg 102, Level 15, State 1, Procedure Staff_NoteGroup_insert, Line 28

Incorrect syntax near 'ENABLE'.

Msg 102, Level 15, State 1, Procedure Staff_NoteGroup_insert, Line 33

Incorrect syntax near 'COMMIT'.


Where is the problem?
I'm using sql server 2005

Thanks,
Max