Distance From & CrossHair

Im trying to edit this simple drag script but what I want is to make it so there has to be a range to start dragging a rigidbody. So if(dist < 8) sort of thing.

Right now in order to make this script work you need to click on a rigid body, how do I change it to work when the cursor is on the rigidbody you can use the key X?

also when hoving over the rigid body if in range I want to change to crosshair to a hand and bring up a label saying press X if not holding the object.

 private var springJoint : SpringJoint;
 
 function Update ()
 {
 
     // Make sure the user pressed the mouse down
     if (!Input.GetMouseButtonDown (1))
         return;
 }
 
     var mainCamera = FindCamera();
         
     // We need to actually hit an object
     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");
         body = go.AddComponent ("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 (1))
     {
         var ray = mainCamera.ScreenPointToRay (Input.mousePosition);
         springJoint.transform.position = ray.GetPoint(distance);
         yield;
     }
     if (springJoint.connectedBody)
     {
         springJoint.connectedBody.drag = oldDrag;
         springJoint.connectedBody.angularDrag = oldAngularDrag;
         springJoint.connectedBody = null;
     }
 }
 
 function FindCamera ()
 {
     if (camera)
         return camera;
     else
         return Camera.main;
 }