Change mouse sensitivity with slider

hi , What i am trying to do is LOWER my Current X AND Y mouse look sensitivity when i change the hoirzontal GUI slider left or right . i have some code set up , but nothing sees to be working - Oh i am working with Javascript aswell

Slider script snippet :

 static var Msensitivity : float = 250;
  
 Msensitivity = GUI.HorizontalSlider (Rect (430, 145, 400, 25), Msensitivity, 50, 400);
  
   GetComponent("FPSMouseLook").sensitivityX = Msensitivity;
 Mouse Look script :
 
 ublic  enum RotationAxis {MouseX = 0, MouseY = 1}
  
   var RotationAxisRotationXY = RotationAxis.MouseX || RotationAxis.MouseY;
  
   var sensitivityX : float = 400f;
  
   var minimumX : float = -360f;
  
   var maximumY : float = 360f;
  
   var RotationX : float = 0f;
  
   var OriginalRotation : Quaternion;
  
   var RotationY : float = 0f;
  
   var minimumY : float = -360;
  
   var maximum : float = 360f;
  
   var sensitivityY : float = 400f;
  
  
 function Update () {
  
  
     if( RotationAxisRotationXY == RotationAxis.MouseX){
  
        RotationX += Input.GetAxis("Mouse X") * sensitivityX * Time.deltaTime;
  
           OriginalRotation = XQuaternion = Quaternion.AngleAxis (RotationX , Vector3.up);
  
               transform.localRotation = OriginalRotation * XQuaternion;
  
  
 }
  
 }

Yes , i know i can only move on the X - Axis but i will add the Y right now or soon , and add the same code ( The one you guys give me :D ) and make it on the Y instead . Thank you for your time !