Category/SubCategory

Hello to all my fellow PHP friends, I'm embarking on yet another trecherous adventure. This time Categories, Sub-Categories and Sub-Sub Categories.. This is for a shopping cart module where the admin can create categories, sub-categories, and sub-sub categories and then place in a certain sub-sub category. This is a two fold question, first I will draw an example display of what I am trying to accomplish. Example: Main Category | ---> Sub Category | ---> Sub-Sub Category | ---> Product Main Category2 | ---> Sub Category2 | ---> Sub-Sub Category2 | ---> Product2 Question 1: Admin needs to be able to create new sub categories and assign them to a main category and be able to create a sub-sub category to assign to a sub category and then a product to assign to a sub-sub category. When adding a new product the admin needs to select a main category which then creates a dropdown box for a subcategory, which then (IF admin chooses) create a dropdown box for a sub-sub category. Any ideas on how to create a function to handle this? I've seen lots of unstable javascript code to do this (not to mention difficult to manage) Question 2: When displaying the category/sub/sub-sub category listing to the viewers, whats the best way to handle the output? Thanks in advance for all your help, Tony Devlin