Can you change Static Variable values from another script?

So whenever I press Shift, the Sprint Input Button, the animation plays, yet the WalkAcceleration stays the same. I'm pretty sure I'm missing something or maybe a line is overlapping another line.

Animation Script:

 var AnimController : GameObject;
 var rSound: AudioSource;
 var rLoading: boolean = false;
 var rLoadingAnim: Animation;
 var Sprinting : Animation;
 
 function Start() {
     // Set all animations to loop
    AnimController.animation.wrapMode = WrapMode.Loop;
    // except shooting
    AnimController.animation["Reload"].wrapMode = WrapMode.Once;
  
    // Put idle and walk into lower layers (The default layer is always 0)
    // This will do two things
    // - Since shoot and idle/walk are in different layers they will not affect
    //   each other's playback when calling CrossFade.
    // - Since shoot is in a higher layer, the animation will replace idle/walk
    //   animations when faded in.
    AnimController.animation["Reload"].layer = 1;
    // Stop animations that are already playing
    //(In case user forgot to disable play automatically)
    AnimController.animation.Stop();
  
 }
  
 function Update() {
     if (Input.GetButton("Sprint") && Input.GetButton("Vertical")) {
     animation.CrossFade("Run", 0.4);
     PlayerMovement.walkAcceleration = 11005;
     }
     else {
     animation.CrossFade("Idle", 0.5);
     PlayerMovement.walkAcceleration = 5000;
     }
     if (Input.GetKey("w") && !Sprinting.IsPlaying("Run")) {
     animation.CrossFade("Walk", 0.2);
     }
     if (Input.GetKey("a") && !Sprinting.IsPlaying("Run")) {
     animation.CrossFade("LeftWalk", 0.2);
     }
     if (Input.GetKey("d") && !Sprinting.IsPlaying("Run")) {
     animation.CrossFade("RightWalk", 0.2);
     }
     if (Input.GetKey("s") && !Sprinting.IsPlaying("Run")) {
     animation.CrossFade("Backwards", 0.2);
     }
     if (Input.GetButtonDown("Reload1") && !rLoading && GunScript.currentAmmo < 36) {
     animation.CrossFade("Reload", 0.2);
     rSound.Play();
     GunScript.currentAmmo = GunScript.maxAmmo;
     rLoading = true;
     }
     if (rLoading && !rLoadingAnim.IsPlaying("Reload"))
     {
     rLoading = false;
     }
 };

PlayerMovement Script:

 static var walkAcceleration: float = 5000;
 var walkAccelAirRatio: float = 0.1;
 var walkDeacceleration: float = 5;
 @HideInInspector
 var walkDeaccelerationVolx: float;
 @HideInInspector
 var walkDeaccelerationVolz: float;
 var cameraObject: GameObject;
 var maxWalkSpeed: float = 10;
 @HideInInspector
 var horizontalMovement: Vector2;
 var jumpVelocity: float = 20;
 @HideInInspector
 var grounded: boolean = false;
 var maxSlope: float = 60;
 
 @HideInInspector
 var paused : boolean = false;
 
 function Update () {
 
 transform.rotation = Quaternion.Euler(0, cameraObject.GetComponent(MouseLookScript).currentYRotation, 0);
 if (horizontalMovement.magnitude > maxWalkSpeed)
     {
     horizontalMovement = horizontalMovement.normalized;
     horizontalMovement *= maxWalkSpeed;
     rigidbody.velocity.x = horizontalMovement.x;
     rigidbody.velocity.z = horizontalMovement.y;
     }
     
     if(grounded)
     {
         rigidbody.velocity.x = Mathf.SmoothDamp(rigidbody.velocity.x, 0, walkDeaccelerationVolx, walkDeacceleration);
         rigidbody.velocity.z = Mathf.SmoothDamp(rigidbody.velocity.z, 0, walkDeaccelerationVolz, walkDeacceleration);
     }
     
         if (grounded)
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * Time.deltaTime, 0, Input.GetAxis("Vertical") * walkAcceleration * Time.deltaTime);
         else
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * walkAccelAirRatio * Time.deltaTime, 0, Input.GetAxis("Vertical") * walkAcceleration * walkAccelAirRatio * Time.deltaTime);
 
 horizontalMovement = Vector2(rigidbody.velocity.x, rigidbody.velocity.z);
 
 
 
     if(Input.GetButtonDown("Jump") && grounded)
     {
         rigidbody.AddForce(0,jumpVelocity,0);
     }
 
 }
 
 function OnCollisionStay (collision:Collision) {
 
 for(var contact: ContactPoint in collision.contacts) {
     if(Vector3.Angle(contact.normal, Vector3.up) < maxSlope) {
         grounded = true;
     }
 }
 
 }
 
 function OnCollisionExit () {
 grounded = false;
 }