how to check presence of a function and set permissions?

hello!

since i am now destroying and recreating my functions at every request
(due to the fact that pl/psql can't cope with dynamic table names, and i
didn't found anywhere a decent doc about pl/perl) i have now the
problem, that a psql error is displayed if i try to drop  a nonexistent
function, or sometimes when i created the function through psql an
ownership error, giving a permission denied to drop that function...

so is there a way to check before dropping if a function exists, and is
it possible to ovverride the ownership of a function? do the same GRANT
mechanisms aply to functions (at least the syntax has to change a
bit...)?

-- 
ciao bboett
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bboett@earthling.net
http://inforezo.u-strasbg.fr/~bboett http://erm1.u-strasbg.fr/~bboett
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