http://www.hellrising.com/index.php
This game is a a zombie/vampire survival MMOrpg.
It is browser based, and similar to Urban dead, for those who know what that is.
Either way, its a much faster paced game than the latter, with more skills and items, you can build your own guilds/groups and whatnot.
You choose to play a human, where you try to survive and fight the undead hordes.
Or zombie, you attempt to hunt humans and vampires, or vampire where you hunt humans and zombies.
Anyways give the game a try, its pretty fun