MS SQL SERVER - controlling transaction (begin, end, rolback, commit)

BEGIN TRAN

UPDATE  [dbo].[Shippers] SET [Phone]='33333' WHERE [ShipperID]=6

IF @@ERROR > 0  

BEGIN

ROLLBACK TRAN

RETURN

END

UPDATE  [dbo].[Shippers] SET [Phone]='444444' WHERE [ShipperID]='A23'

IF @@ERROR > 0  

BEGIN

ROLLBACK TRAN

RETURN

END

COMMIT TRAN