Browser RPG Game

I am looking to make an online, browser based RPG game. It would require charecter creation, and then individual pages where those who are members of the site would play the game (fight battles, shop at stores, visit towns, talk to other players). I would like for the players to be able to follow quest-lines, and possibly battle against or with eachother. Similar sites: [login to view URL] (Browser war game), [login to view URL] (similar to what i'm looking for, but with more multiplayer capabilities)