about pg_proc (column pronamespace)

i all. Looking for a way to change some functions to 'security
definer'. This is only going to happen in some of the schemas.I found
that pg_catalog.pg_proc have a bool column (prosecdef), which contains
if some function is defined as 'security definer'. So good. It also
contains a column named pronamespace, which contains (or should) the
schema.

After this
SELECT distinct pronamespace from pg_catalog.pg_proc;
pronamespace
--------------
11
2200
11313
1901391
1901393
1901396
1901397
1901398
1901399

i would say that, in pg_catalog.pg_namespace i should be able to found
the schema for a particular function. But nope:
glyms_f_test=# SELECT * from pg_catalog.pg_namespace ;
nspname | nspowner | nspacl
--------------------+----------+-------------------------------------
pg_catalog | 10 | {postgres=UC/postgres,=U/postgres}
pg_toast | 10 |
pg_temp_1 | 10 |
pg_toast_temp_1 | 10 |
information_schema | 10 | {postgres=UC/postgres,=U/postgres}
[snip]
public | 10 | {postgres=UC/postgres,=UC/postgres}
(15 rows)

Obviously im missing something, i cant find any relation between
pg_proc.pronamespace and pg_namespace.

Im using PG 8.3.5 (Also tested in 8.2.5 with same results)

Any hints?
Thanks!

Gerardo