Tower Defense: Help needed! *fixed it? :/*

-Timo-

hey guys
I am trying to make a tower defense game and its going better then I expected... xD
but now I am stuck. everything works fine when I only have 1 tower, the tower shoots when its inside his range and so on but when I place a second tower it doesn't work like I want.
can someone help me?
here are some codes I have
Tower:

http://imageshack.com/scaled/grid240/17/yst.png
Bullet:

http://imageshack.com/scaled/large/17/yst.png
thanks

-Timo-

-Timo-

not the best way how to fix it but I fixed it ^^

joshiwu

@timolapre1998 or you could make invisible sweepers that orbit the tower, that bounce back and forth. at different lenghts. the smaller sweepers would have detection priorety.