Simple Project - Referral script

Hello, I am in need of a simple script that adds the referrer name in the URL to the form. for example, if [login to view URL] is the URL when we navigate to a different page to submit a form, the referral number (ref=123456) should be included in the next page where a user has to submit a form that is mailed to the site owner. I don't know if I explained it right. Check this site, you will get a better idea. [login to view URL] [login to view URL] [login to view URL] These are the example pages that i am looking for. I dont think any database is needed for this simple script. It should do something with CSS I guess. My budget is low as this is very simple for someone who has the knowledge. I can pay around $50.