Affiliate Program Script for Ad Network

We're looking for a custom affiliate program script for our ad network. It will allow users to sign up for the affiliate program. Then, the users will be assigned a certain tracking URL. That URL will go to our registration form and will put a cookie on the visitor's computer. We have an existing form, but its not on our server and we can't edit it. So, you have to recreate the form on our server and have the data somehow placed on the real form in the background. The real form goes on for four separate pages. The POST function might help you here. After the user signs up, the affiliate will be able to see the name of the user who signed up. Also, the affiliate will have several banners to choose from to apply their tracking link to and automatically create html placement code of the banner. Here's an optional feature, but if you can include it, it'll improve your bid. We have a control panel hosted elsewhere. The affiliate script should be able to login to our control panel and get the earnings data and automatically calculate a certain % of it and have the amount show up in the affiliate's control panel. If not, you can also create a feature where we can upload an excel file with the names and earnings, and the script automatically matches the data with the appropriate affiliate and calculates 5% etc. If you can suggest a different work around, please tell us. We can provide the source code of some existing affiliate scripts so that you can modify them, to make the work a lot easier. The hard parts are the form, and the part to get the earnings data.