Multi-level menu with Modified Preorder Tree Traversal

Hi all,

In this well known example, the indention of the levels is done by some &nbsp;'s instead of <ul><li>'s.

I wonder if there's a way to use MPPT (Modified Preorder Tree Traversal) logic to dynamically build those multi-level menu without using any recursion?  I can't figure out where I have to close those <ul>'s and <li>'s... :s

Thx!

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