Rotation - Simple Question

Hello everyone, and sorry to waste time with such a probably trivial thing, however I've ran into a problem limiting the rotation while going up and down, however with a custom smoothing script.

Any help is appriciated!

 #pragma strict
 var QuadMax            : float[];
 var CameraR            : Transform;
 var Speed            : float         = 5.0;
 var Move            : float;
 var Addition        : float;
 
 var CoMovement        : Vector3;
 
 var Movement        : boolean;
 function Start () {
     
 }
 
 function Update () {
     Move = Speed;
     Movement = false;
     CameraR.eulerAngles += CoMovement;
     if(Input.GetKey(KeyCode.W)&& !Movement){
         Movement = true;
         if(CameraR.eulerAngles.x < QuadMax[0]){
             CoMovement.x = Mathf.MoveTowards(CoMovement.x, (Speed + Addition), 2.9*Time.deltaTime);
         }
     }
     if(Input.GetKey(KeyCode.S) && !Movement){
         Movement = true;
         if(CameraR.eulerAngles.x > QuadMax[1]){
             CoMovement.x = Mathf.MoveTowards(CoMovement.x, -(Speed + Addition), 2.9*Time.deltaTime);
         }
     }
     if(Input.GetKey(KeyCode.A)&& !Movement){
         Movement = true;
         CoMovement.y = Mathf.MoveTowards(CoMovement.y, (Speed + Addition), 2.9*Time.deltaTime);
         
     }
     if(Input.GetKey(KeyCode.D)&& !Movement){
         Movement = true;
         CoMovement.y = Mathf.MoveTowards(CoMovement.y, -(Speed + Addition), 2.9*Time.deltaTime);
     }
     if(Movement && Addition < 0.9){
         Addition += 0.55*Time.deltaTime;
     }
     else{
         if(Addition > 0){
             Addition -= 1.5*Time.deltaTime;
         }
         //CoMovement = Vector3.MoveTowards(CoMovement, Vector3(0,0,0), 2* Time.deltaTime);
         CoMovement.x =    Mathf.MoveTowardsAngle(CoMovement.x, 0, 2*Time.deltaTime);
         CoMovement.y =    Mathf.MoveTowardsAngle(CoMovement.y, 0, 2*Time.deltaTime);
     }
     
     //CameraR.eulerAngles = Movement;
 }