how to pass tablename to a function

Hi, All

I like to pass the tablename to function but not using execute clause, here
is my script

CREATE OR REPLACE FUNCTION functions.pgsql_event_unpack_batch(IN _tbl text,
IN jobid bigint, IN jobtime timestamp with time zone, IN startid bigint, IN
stopid bigint)
RETURNS TABLE(events bigint, errors bigint[]) AS
$BODY$
BEGIN

RETURN QUERY
WITH
unpacking (raw_id, time, userid, eventtype, pagename, userhost,
application, status, error)
AS (
select
id as raw_id,
(up).time,
(up).userid,
coalesce((up).eventtype, ''),
coalesce((up).pagename, ''),
(up).userhostaddress as userhost,
coalesce((up).application, ''),
(up).status,
(up).error
from(
select id,
functions.python_events_unpack(event_object) up
from _tbl
where id between startid and stopid
) a
where (up).userid is not NULL
)

I want to pass the _tbl to the select query integrated in the unpacking(),
how can I make it?

thanks

Alec

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