plpgsql question

Can I do something like this:

CREATE TABLE sample (id SERIAL, node INTEGER, parent INTEGER);
INSERT INTO sample(node,parent) VALUES(1,0);
INSERT INTO sample(node,parent) VALUES(2,0);
INSERT INTO sample(node,parent) VALUES(3,1);
INSERT INTO sample(node,parent) VALUES(4,3)

CREATE OR REPLACE FUNCTION article_display(anyelement, anyelement)
RETURNS SETOF samle AS $$
    DECLARE
        articleRow sample%ROWTYPE;
    BEGIN
        FOR articleRow IN SELECT comments
        FROM theirry.articles
        ORDER BY article_id
        DESC LIMIT $1
        OFFSET $2 LOOP
    RETURN NEXT articleRow;
    END LOOP;
    RETURN;
    END;
$$ LANGUAGE plpgsql;

Thanks,
J