PHP Quiz Forms - Send to a Friend

this should be a pretty simple project i want to make an online quiz form for people to send to their friends.. i need it to generate a unique URL based off of an email address. for instance. 1. the user puts in their EMAIL address - then they are given a unique URL to send their friends to the quiz. (for instance something like [login to view URL]) 2. after the friend fills out the form it emails the original person the results of the quiz. Pretty much i'd like to mimick the quiz on this site - www (dot) howsexyareu (dot) com .... the only difference would be that i will have more than one quiz, so i should be able to use the script you provide me with, and make multiple quizes. thanks.