Set Transcation Isolation level bug

Your name : Alois Maier
Your email address : almaier(at)yahoo(dot)com

System Configuration
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Architecture (example: Intel Pentium) : Intel Pentium
Operating System (example: Linux 2.0.26 ELF) : Linux 2.0.36 ELF
PostgreSQL version (example: PostgreSQL-6.5.1): PostgreSQL-6.5.1
Compiler used (example: gcc 2.8.0) : egcs-2.91.66

Please enter a FULL description of your problem:
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SET TRANSACTION ISOLATION LEVEL SERIALIZABLE does not set the transaction
isolation level to erializable.

Please describe a way to repeat the problem. Please try to provide a concise
reproducible example, if at all possible:
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test=> SHOW TRANSACTION ISOLATION LEVEL;
NOTICE: TRANSACTION ISOLATION LEVEL is READ COMMITTED
SHOW VARIABLE
test=> SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SET VARIABLE
test=> SHOW TRANSACTION ISOLATION LEVEL;
NOTICE: TRANSACTION ISOLATION LEVEL is READ COMMITTED
SHOW VARIABLE

If you know how this problem might be fixed, list the solution below:
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