Please Help Me With SavePoint

Hi,

I'm studying MS SQL 2000, and i see SAVE POINT statement. I try it:
===================================
BEGIN TRANSACTION

UPDATE emp SET sal = 2000 WHERE ename = 'BLAKE'
SAVE TRANSACTION SAVETRANS_1

UPDATE emp SET sal = 1500 WHERE ename = 'CLARK'
SAVE TRANSACTION SAVETRANS_2

SELECT SUM(sal) FROM emp

ROLLBACK TRANSACTION SAVETRANS_2

UPDATE emp SET sal = 1200 WHERE ename = 'CLARK'

COMMIT TRANSACTION

===================================
But it always rollback to SAVETRANS_1. I do not know how to ? Please help me. Thanks you very much.

Best gurad,
HaiNguyen - Sorimachi Viet Nam - lh9911051@yahoo.com