One of my scripts can't find the variable from this script

I want to know how to get my variable(walkSpeed) to work on another script

pragma strict

function Start () {

}

function Update () {

var maxWalkSpeed = 10.0;

var maxTurnSpeed = 100.0;

// Get the horizontal and vertical axis. // By default they are mapped to the arrow keys. // The value is in the range -1 to 1

 var walkSpeed = Input.GetAxis ("Vertical") * maxWalkSpeed;

 var turnSpeed = Input.GetAxis ("Horizontal") * maxTurnSpeed;

 // Move translation along the object's z-axis

 transform.Translate (0, 0, walkSpeed * Time.deltaTime);

 // Rotate around our y-axis

 transform.Rotate (0, turnSpeed * Time.deltaTime, 0);

}