Voltage Regulator For Servos

I need to provide external power for the servos as I'm using a lot of them. Can any one suggest any voltage regulator for the external supply of voltage and how do I connect them to the servos. Does anyone have some images of the wiring that would guide me...

Which voltage regulators shall provide the juice for the servos? I have four servos in each arm of the robot. Shall I use one voltage regulator for each arm?