need multiplayer chat game made quickly

I need an online game made where people can walk around and chat with each other. It can use any technology though I assume flash is the best? The main requirement I have is that it support a large number of users, and I need this finished very quickly. I have designers who will be making all the characters and backgrounds. I also have a server you can use [login to view URL] if that is useful, it will take care of storing objects and users. The requirements for this include: 1) set up realtime environment for multiple users (as many as server will support) 2) six maps connected to each other, so person can move into each room (they all load separately) 3) users can chat with each other 4) I need 30 objects added and 20 non-player characters, the objects will give choices to the user which I will write out for you (for example user clicks water cooler and menu says "drink water", and I will want the non-player characters to either say things when a user clicks on them, or walk around randomly. Please send me past game work and any questions, also please let me know how much time you have to start and if you can start immediately.