change contact info on website via referrers link

I need something that will change the contact info on all pages according to a users referral link. I need it to keep visitors from directly contacting my company. So the users can promote my site without the fear of losing their lead. In addition there needs to be a cookie stored on the visitors computer so if they return to the site it will show the users contact info. So, user A uses ([login to view URL]) and it changes the contact info on the site. Maybe change a contact form on the contact us page.