A friend from the gamemaker forums, known as sn0b0arder381 made this and approved me spreading it.
Here are some screenshots
http://img206.imageshack.us/img206/6195/topdownonlinescreenshot22lu.png
http://img210.imageshack.us/img210/8861/topdownonlinescreenshot19vm.png
http://img53.imageshack.us/img53/442/topdownonlinescreenshot31oz.png
W,A,S,D and mouse to move
Left click to shoot
R to reload
Enter to start typing/send
http://host-a.net/getfile.php?usern=sn0wb0arder381&file=TopdownOnline.zip
Works for windows, if you're a mac user, a windows emulator is required.
Thread
Posts in chronological order
Sorry but that's no CS:Source or BF2:MC. :P