make users login

Hi, I need something done fast. I have a search result page that has a field where users can get the freelancers' contact email. Right now anyone can make contact including spammers. I need to make the contact email only shown to people who are registered and login. The login page is done. See the bottom of the page under contact. [login to view URL] I need this done very fast. If you're an experienced php programmer, it'll take you 20 minutes. I need to have this done in a few hours. Budget: <$15 Thanks,