pl/pgsql FOR LOOP with function

Hello,

How can I return the contents of the row object without knowing the names of
the parameters in it ? I'd like to do something like row[1] or something
similar. Or is there a way to actually get the values knowing the return
type but not the name?

FOR row IN SELECT * FROM getgroups(usr) LOOP

.. snip ..

END LOOP;

when

FUNCTION getgroups(usr name) RETURNS SETOF name AS

Thanks

David