Fantasy Sports Betting Website

I am interested in starting a Fantasy Sports Betting website. I would like to set this site up using Joomla as the base. I already have a couple of Joomla websites setup so I have experience in running Joomla based websites. I would like someone to provide me with a Sports Betting script that can be integrated into my site, more so with the Joomla framework. The script will use Joomla's authentication and will allow me or my administrators to setup different game listings, and allow members to bet on games, create listing of top winners, show listing of upcoming contests, etc. Integration of all this should be done in mysql, php on a Linux based web server. It should also be very scalable. Something similar to [login to view URL] or other sports bookie sites, except the main difference in my site is that it will be free to signup and use. I would also be interested if you have already designed a Sports Betting site, and could just deliver the whole working site as a turnkey site.