mod_rewrite help

I'm working on developing roscripts and I came across an important issue: Search engyne friendly url's. I have a function which makes things easier but something's missing.
At this moment, a listing page url looks like this:
domain/name-of-listing.html

and this is under Flash > Software as a categ.

What I want is this (the category to be present in the url of the listing page, no matter how deep my listing goes in the category tree):

domain/Flash/Software/name-of-listing.html

I appreciate your help, if any.

I don't think having the category name in the URL is as important as keeping a consistent hierarchical structure.

So, in your example, even if you keep categories as ID's, locating related content within corresponding "virtual directories" would seem to be a great way to organize the directory structure. Like..

Category:

domain/category_ID/

Listing:

domain/category_ID/name-of-listing.html