[Zope] tree structure

[jacintha menezes]

Hi,
   I am sending a variable say userid with it's value as hidden as the root
of the tree to the next page where the code for the tree structure is
written.The tree structure page
displays the branches of root(this value had come as hidden by the name
userid) but i can't expand further.
It says Error value : userid (the variable which had come has hidden).
To be clear i want to build a hierarchy of people taking Employee No as the
id.
please throw some light.

                        Thanks,
                          jacintha