has_table/schema_privilige() returns incorrect info on temp tables

Hi,

While running 2 sessions in different terminals for the same user, what
happens in the second session here looks a bit weird:

=========
<session 1>
=========
db=# create temp table t_test (id int);
CREATE TABLE

db=# select table_schema from information_schema.tables
where table_name = 't_test';
table_schema
--------------
pg_temp_2
(1 row)

db=# select has_schema_privilege('pg_temp_2', 'usage');
has_schema_privilege
----------------------
t
(1 row)

db=# select has_table_privilege('pg_temp_2.t_test', 'insert');
has_table_privilege
---------------------
t
(1 row)

db=# select has_table_privilege('t_test', 'insert');
has_table_privilege
---------------------
t
(1 row)

db=# insert into t_test values (1);
INSERT 0 1

=========
<session 2>
=========

db=# select table_schema from information_schema.tables
where table_name = 't_test';
table_schema
--------------
pg_temp_2
(1 row)

db=# select has_schema_privilege('pg_temp_2', 'usage');
has_schema_privilege
----------------------
t
(1 row)

db=# select has_table_privilege('pg_temp_2.t_test', 'insert');
has_table_privilege
---------------------
t
(1 row)

db=# select has_table_privilege('t_test', 'insert');
ERROR: relation "t_test" does not exist

db=# insert into t_test values (1);
ERROR: relation "t_test" does not exist

db=# select version();
version
------------------------------------------------------------------------
PostgreSQL 8.1.3 on i586-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2.3
(1 row)

In this light, is there a possibility to find out what schema will be used for
temporary tables created during the current session? I need to find out
whether a specific temporary table exists and is accessible for the current
user in the current session.

--
Best,

Frank.