I am working on a project at work in which I need to create a library of 
javascript functions so that people who need to add a menu to their web 
site don't have to retype the same code someone else has written.  I was 
able to write up a group of cross-browser functions to create a regular 
drop-down menu that was configurable to allow users to include as many 
levels of menus as they wanted.  
    Now I've been asked to do the same for tree menus.  Unfortunately, I 
haven't been able to find anything on the web about tree menus that I 
could use as a basis for my libraries.  One of the books I read showed the 
use of separate spans for each submenu under each option, but it said the 
code won't work in Netscape 4 browsers, which I need to include in my 
functionality.
    Has anyone ever worked on anything similar to this or seen how to get 
around this Netscape problem?

Chris