car move automatically script for mobile

in my game the car moving automatically on touch screen and the player just move left and right I need to correct my script…

var forwardSpeed : float = 3;
var turnSpeed : float = 2;

function Update() {

var forwardMoveAmount = Input.GetAxis(“Vertical”)*forwardSpeed;

var turnAmount = Input.GetAxis(“Horizontal”)*turnSpeed;

transform.Rotate(0,turnAmount,0);

transform.Translate(Vector3.forward * Input.GetAxis("Vertical") * Time.deltaTime*30);
	if (Input.GetKey ("escape")) {
		Application.Quit();}

}

http://forum.unity3d.com/threads/car-move-automatically-script-for-mobile.288524/