Using the Tree behavior

I'm having trouble using the Tree behavior. Exactly from where do I
get the 'lft' right 'rght' values? I can't figure out what these
values could be.

For example:

(Parent 1) Category 1
(Child of Parent 1) Category 1.1
(Child of Parent 1) Category 1.2
(Parent 2) Category 2
(Child of Parent 2) Category 2.1
(Child of Category 2.1) Category 2.1.1

How would I get along doing something like that? I'm trying to create
a simple CMS for my website, and there has to be an automated way of
finding these 'lft' and 'rght' values.

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