Help With Stored Procedure Needed ASAP!

Hello,
I'm new to SQL. I wrote this Stored Procedure but it does not work. When I'm executing it I get these errors:

Server: Msg 170, Level 15, State 1, Procedure Test, Line 12
Line 12: Incorrect syntax near '='.
Server: Msg 170, Level 15, State 1, Procedure Test, Line 15
Line 15: Incorrect syntax near ')'.
Server: Msg 170, Level 15, State 1, Procedure Test, Line 19
Line 19: Incorrect syntax near '='.
Server: Msg 170, Level 15, State 1, Procedure Test, Line 24
Line 24: Incorrect syntax near '='

Can anyone please help me with that?
Thank you in advance.




CREATE PROCEDURE Test As
BEGIN TRANSACTION
Select PVDM_DOCS_1_5.DOCINDEX1, TableTest.DOCINDEX2, TableTest.DOCINDEX3, TableTest.DOCINDEX4
From PVDM_DOCS_1_5, TableTest

WHERE TableTest.DOCINDEX1 = PVDM_DOCS_1_5.DOCINDEX1

AND (TableTest.DOCINDEX2 Is NULL or TableTest.DOCINDEX2 ='' OR TableTEst.DOCINDEX3 Is NULL or TableTest.DOCINDEX3 ='' or TableTest.DOCINDEX4 is NULL or TableTEst.DOCINDEX4 = '');


IF TableTest.DOCINDEX2 is NULL or TableTest.DOCINDEX2 = ''
UPDATE TableTest.DOCINDEX2 = DOCINDEX2
WHERE (DOCINDEX1 IN
(SELECT DOCINDEX1
FROM PVDM_DOCS_1_5))
END IF

If TableTest.DOCINDEX3 is NULL or TableTest.DOCINDEX3 = ''
UPDATE TableTest.DOCINDEX3 = PVDM_DOCS_1_5.DOCINDEX3
WHERE (DOCINDEX1 IN
(SELECT DOCINDEX1
FROM PVDM_DOCS_1_5))
END IF

If TableTest.DOCINDEX4 is NULL or TableTest.DOCINDEX4 = ''
UPDATE TableTest.DOCINDEX4 = PVDM_DOCS_1_5.DOCINDEX4
WHERE (DOCINDEX1 IN
(SELECT DOCINDEX1
FROM PVDM_DOCS_1_5))
END IF;

DELETE PVDM_DOCS_1_5 WHERE DOCINDEX1 = DOCINDEX1

IF (@@ERROR <> 0) GOTO on_error

COMMIT TRANSACTION
-- return 0 to signal success
RETURN (0)


on_error:
ROLLBACK TRANSACTION
-- return 1 to signal failure
RETURN (1)
GO