How to check if two polygons intersect in Postgres?

How can I check if two polygons intersect in PG 8.3?

# and #? don't work for polygons:

select polygon'((0,0), (1,2), (0,2))' # polygon'((0.5,开发者_开发问答 0), (1,0), (1,1))';
ERROR:  operator does not exist: polygon # polygon

select polygon'((0,0), (1,2), (0,2))' #? polygon'((0.5, 0), (1,0), (1,1))';
ERROR:  operator does not exist: polygon #? polygon

And && gives wrong asnwer:

select polygon'((0,0), (1,2), (0,2))' && polygon'((0.5, 0), (1,0), (1,1))';
 ?column? 
----------
 t
(1 row)

---

It is a known issue with pre-9 Postgres: http://archives.postgresql.org/pgsql-bugs/2011-02/msg00139.php