Function with now() | time 'now' | etc...

Hi all, 
   I wrote the folling function: 

DROP FUNCTION PROC_TESTE(INTEGER); 
CREATE FUNCTION PROC_TESTE(INTEGER) RETURNS INTEGER AS ' 
DECLARE        SEQ RECORD; 
BEGIN        SELECT NEXTVAL(''TEMPOS_ID_SEQ'') AS ID INTO SEQ;        INSERT INTO TEMPOS (ID, INICIO) VALUES (SEQ.ID,
NOW());                       FOR I IN 1..$1 LOOP                INSERT INTO TESTE(VALOR) VALUES (RANDOM()*$1);
ENDLOOP;        UPDATE TEMPOS SET FIM = NOW() WHERE ID = SEQ.ID;        RETURN SEQ.ID; 
 
END;' 
LANGUAGE 'PLPGSQL'; 
   And all times I run it ("select proc_teste(10000);"), i got the folling 
behavour: 

teste=> SELECT * FROM TEMPOS;  inicio  |   fim    | id 
----------+----------+---- 15:12:17 | 15:12:17 | 23 15:12:18 | 15:12:18 | 24 
(...) 
   It doesn't getting different times on each execution. I also tried put 
"timestamp 'now'" insted "now()". What am I doing wrong? 
   Thank you, 
   Edipo Elder    [edipoelder@ig.com.br] 

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