Function debugging question

I have a function I'm working on that I'm trying to get working, and I
can't make out what the error message means, so I thought I'd run it
through here.

Here's the function:

CREATE OR REPLACE FUNCTION
    msgweekfilter(ibox char(20), part char(20), year int, week int, start
int, num int)
    RETURNS SETOF msgweek AS '
DECLARE
    r msgweek%ROWTYPE;
    curs1 refcursor;
    i integer;
BEGIN
    OPEN curs1 FOR SELECT * FROM  msgweek
        WHERE ibx = ibox AND (sibx = part OR ribx = part)
        AND eyear = year AND eweek = week
        ORDER BY count;

    FETCH ABSOLUTE start - 1 FROM cursl INTO r;

    FOR r IN FETCH FORWARD num FROM cursl LOOP
        RETURN NEXT r;
        i = i + 1;
        FETCH NEXT cursl INTO r;
    END LOOP;
    CLOSE cursl;
RETURN;

END' LANGUAGE 'plpgsql'

Yes, I know there are easier ways to do this.  (A simple LIMIT/OFFSET
would do the same.)  However, I need to get this function to work.  If I
can, I'd even like to change the 'FETCH FORWARD' into standard SQL.
(Which I think would require a counted loop, aborting either if the count
is exceded or the invalid.  But that's the next question.)

The error I'm getting is:
ERROR:  syntax error at or near "ABSOLUTE" at character 344
LINE 13: FETCH ABSOLUTE start FROM cursl INTO r;
               ^

As far as I can tell, that line has the correct syntax, which leads me to
one of two conclusions: a) I don't know the correct syntax for FETCH, or
b) I missed something earlier.

Any ideas?

Daniel T. Staal

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