Passing array to PL/SQL and looping

All,

I'm a newbie to PL/SQL and need help badly. I'm trying to pass my array of
id's to the function and then loop through until the array is empty. I know
there must be atleast five things I'm doing wrong. 

Please help!

Cheers,
-p


Call to Procedure and Array:

$myArray = array(15, 6, 23);
select generateInvoice($myArray);

Procedure:

CREATE FUNCTION generateInvoice (VARRAY) RETURNS int4 AS '
       DECLARE               -- local variables               temppk INT4;               v_pids := $1;
v_countBINARY_INTEGER := 1;               id INT4;
 
       BEGIN               SELECT INTO temppk nextval(''t_task_task_id_seq'');
               LOOP               IF v_pids.EXISTS(v_count) THEN
               id := v_pids.NEXT(v_count);
               UPDATE t_project SET task_id=temppk WHERE project_id=id;
               v_count := v_count + 1;
               ELSE                       EXIT;               END IF;               END LOOP;
               -- Everything has passed, return id as pk               RETURN temppk;       END;
' LANGUAGE 'plpgsql';