interating through tree structure

Hi there

Hopefully someone can help me with something that I thought was going to be
straight forward but has been giving me a few problems!

I'm trying to generate site navigation from an xml file which is pretty much
as below:-





















The above is a snapshot as it can go down "n" levels.  If I'm at page6 then my
navigation needs to be:-


  dir1
  dir2
  dir4


  dir5
  dir6


What I'm having difficulty with is how to close the opening ul and open a new
ul when I'm a directory up from the directory level I'm actully on.

A stripped down but working version of What I'm trying is:-



























Can anyone advise me on how to achieve the formatting where I have 2 sets of
ULs? Any pointers much appreciated.

Jim
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