This modification is not for the beginner. If you are not already familiar with Apache Mod ReWrites, PHP/MySQL programming and osCommerce you should probably stop here. This is not a search and replace, line by line tutorial. Rather this is an explanation with code sniblets that can help you get the job done.
If you are looking for a way to automatically customize your osCommerce category and product URLs, then keep reading. This tutorial will show you how to automatically include your category names and product names directly into your URLs! Including search phrases in your URLs has been a known search engine ranking factor for some time now. While some search engines weigh it heavier than others, it has been proven to help rankings.