Just to add to gus's post:
In the first pic, the aileron pushrods are on opposite sides of the servos, this is what you want.
When the left servo arm goes up, the right servo arm will go down. In the second pic, the pushrods are on the same side of both servos, and the ailerons will act like flaps, with both either going up or down together. Just "Y" them together with a standard "Y" adapter and plug them both into the aileron channel of your receiver.

Jesse