What kind of software can I use to make a multiplayer browser game like Mafia Wars?

If there is no such software, what kind of online tutorial should I take? Please post the link too.What kind of software can I use to make a multiplayer browser game like Mafia Wars?mafia wars game is made on PHP you will have to learn full php, mySQL to get a hang of that also flash games are very popular and easy to learn. Try some games on http://www.swfplay.co.uk/ they are all made from flash.