Function with dynamic command (EXECUTE) not working

Hello,

I am trying to create a function that will allow
me to dynamically choose the ORDER BY sequence.

I also want the result of the SELECT statement to
be returned. Far as I can tell this can not be done
with EXECUTE alone rather I should use FOR .. IN EXECUTE.

The result of the statement is a single column of
type varchar. The result amount can be 0 - n.

However, I can not get it to work
This is pretty much how far I have come..

[CODE]
CREATE OR REPLACE FUNCTION "public"."testfunction"(
lisnotactive boolean,
lorderby1 varchar,
lorderby2 varchar
)
RETURNS SETOF record AS
$BODY$
DECLARE
rRec RECORD;
BEGIN

FOR rRec IN EXECUTE( 'SELECT DISTINCT stationplace.name FROM stationplace,
employee WHERE employee.isnotactive = ' || lisnotactive ||
'ORDER BY ' || quote_ident(lorderby1) || ', ' || quote_ident(lorderby2)
) LOOP

END LOOP;

RETURN NEXT rRec;

END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
[/CODE]

Any help is highly appreciated.
Kind Regards,
Robert