Distance from rigid body and drag

I have the drag rigid body script, all I want to do is make it so you can only do this if you are close to the rigidbody and if you are your crosshair turns to a 2d image.. Help please and thank you! Heres my JS

 var normalCollisionCount = 1;
 var spring = 50.0;
 var damper = 5.0;
 var drag = 10.0;
 var angularDrag = 5.0;
 var distance = 0.2;
 var throwForce = 500;
 var throwRange = 1000;
 var attachToCenterOfMass = false;
 var other : Transform;
 var crosshairFirstModeHorizontal : Texture2D;
     
 private var springJoint : SpringJoint;
  
 function Update ()
 {
     // Make sure the user pressed the mouse down
 //var dist = Vector3.Distance(!hit.rigidbody.position, transform.position);
 //if (dist < 1 ) {
     if (!Input.GetMouseButtonDown (0))
         return;
  
     var mainCamera = FindCamera();
  
     // We need to actually hit an object
     var hit : RaycastHit;
     if (!Physics.Raycast(mainCamera.ScreenPointToRay(Input.mousePosition),  hit, 100))
         return;
     // We need to hit a rigidbody that is not kinematic
     if (!hit.rigidbody || hit.rigidbody.isKinematic)
         return;
         
     if (!springJoint)
     {
         var go = new GameObject("Rigidbody dragger");
         var body : Rigidbody = go.AddComponent ("Rigidbody") as Rigidbody;
         springJoint = go.AddComponent ("SpringJoint");
         body.isKinematic = true;
     }
  
     springJoint.transform.position = hit.point;
     if (attachToCenterOfMass)
     {
         var anchor = transform.TransformDirection(hit.rigidbody.centerOfMass) + hit.rigidbody.transform.position;
         anchor = springJoint.transform.InverseTransformPoint(anchor);
         springJoint.anchor = anchor;
     }
     else
     {
         springJoint.anchor = Vector3.zero;
     }
  
     springJoint.spring = spring;
     springJoint.damper = damper;
     springJoint.maxDistance = distance;
     springJoint.connectedBody = hit.rigidbody;
  
     StartCoroutine ("DragObject", hit.distance);
 //}
 }
  
 function DragObject (distance : float)
 {
 
     var oldDrag = springJoint.connectedBody.drag;
     var oldAngularDrag = springJoint.connectedBody.angularDrag;
     springJoint.connectedBody.drag = drag;
     springJoint.connectedBody.angularDrag = angularDrag;
     var mainCamera = FindCamera();
     while (Input.GetMouseButton (0))
     {
         var ray = mainCamera.ScreenPointToRay (Input.mousePosition);
         springJoint.transform.position = ray.GetPoint(distance);
         yield;
  
         if (Input.GetMouseButton (1)){
             springJoint.connectedBody.AddExplosionForce(throwForce,mainCamera.transform.position,throwRange);
             springJoint.connectedBody.drag = oldDrag;
             springJoint.connectedBody.angularDrag = oldAngularDrag;
             springJoint.connectedBody = null;
         }
     }
     if (springJoint.connectedBody)
     {
         springJoint.connectedBody.drag = oldDrag;
         springJoint.connectedBody.angularDrag = oldAngularDrag;
         springJoint.connectedBody = null;
     }
     
 }
  
 function FindCamera ()
 {
     if (camera)
         return camera;
     else
         return Camera.main;
 }