capture referring keyword data

I use a program called master survey. [login to view URL] to collect survey data. what I need is an add on to this program that will collect the referring url from the visitor to the form and ultimately the database. if possible it would be a script that can be added to the survey form and submits the keyword data as an "answer" in a form field. I use a lot of ppc and would like to compare survey answers to the keyword people typed in that caused them to land on my ad and subsequently onto my survey. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows? (depending on the nature? of the deliverables): a)? For web sites or? other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software? installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform the script type can be found at the url given in the description