a little htaccess work rewriting 3 max 4 general urls

Hy there. This work is very simple, and hopefully woudn't take too much work. I have a website which already has a htaccess file for rewriting the url's. The problem is that they are not quite the way i want them. They would need to be modified. There are 3 generic type of urls or 4 at the max. You will also need to modify the php file that generates the link for the new htaccess to work. This is an easy job, don't act like it's an expensive one, ok? :) Happy bidding.