Using SHOW in PL/pgSQL

Hi everybody

I have a brief question. It it just a simple yet annoying problem.
How can I use SHOW to retrieve a value inside a PL/pgSQL function?

I am looking for something like that:

SELECT enable_seqscan;

Is there a system table where I can find all the values on 7.2.3?
It seems as if there was no way to use SHOW in a subselect.

Any ideas to solve this problem efficiently.

    Hans

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