plpgsql functions organisation

I find my plpgsql functions becomes unreadable very quickly. I want to break
them up in smaller functions.

What is the best way to organised them?
Is there any way to define functions inside functions?
When I list functions in psql, I can see them all at the same level, is there
any way to organise them in packages like with python and other languages, so
the smaller functions are hidden away in a package/directory?


Thanks.

--
http://yves.zioup.com
gpg: 4096R/32B0F416