ok i dont know if this was already posted but, in this browser you get a tank and you

A) blast other players

or

you jack there flag

every time you make an action you have to wait 9 secends before you can do another action like (move or fire). also there are power ups and if you register (free) you can use the map editor.

you dont have to register to play but there are some limitations. Last its flash so i can use my school computers and play during class when the teacher is not looking

http://www.tankmania.com/