The Servo library works fine for 12 Servos as i mentioned in my first post (i used one servo and plugged it in the different pins).
The problem is that I want to send commands to the arduino over the serial port to control the servos.
And the serial and servo library just dont work together. So as soon as i start a serial port, all servos stop and only serial communication is working.
There are samples on arduino.cc liek this one: Arduino Playground - SingleServoExample
but these samples are just not working. at least on the mega2560.
I hope there is a way to get that working.