[Alan Anderson]

Just saying you want to "control servos with a joystick" isn't nearly enough information. Do you want the servo position to match the position of the joystick? For example, would you like to move the joystick to the left and the servo turns to the left, then you return the joystick to the center position and the servo returns to center? Or do you want the servo to move based on the joystick, where it travels further left each time you push the joystick left, and travels further right each time you push the joystick right, and stays where it is when the joystick is in the center position? Or do you want the servo to move constantly as long as the joystick is pressed to the side? Do you want it to move slowly when the joystick is just pressed a little, and quickly when the joystick is pressed a lot?

Try again to say exactly what you want to have happen. Use as much detail as possible. Before you can write a program to do it, you have to be able to describe what you want it to do in clear, unambiguous terms.