MPTtree, Hieararchical trees in a database table

[eluser]Unknown[/eluser]
m4rw3r you have done a good job.
I a`m beginner, and I really can`t understand how to build such menu
+Root
|--Main Category 1
| |--Subcat 1
| |--Subcat 2
| | |--Sub-subcat 1
| | |--Sub-subcat 2
| |--Subcat 3
|--Main Category 2
| |--Subcat 4
| |--Subcat 5
| |--Sub-subcat 3
|--Main Category 3
|--Main Category 4
| |--Subcat 6
| |--Subcat 7

What have I do with the functions written by crises???
Would I have to add one of them(function category) to your controller wiki??? and others to the mpttree model???

Thanks for your answer and your work...