Carrying Objects OnMouseOver

var Object1 : Transform; //what your picking up, the object that you want to move

var dist = 5; //distance at which you can pick things up

private var isHolding = false;

function Update () {

 if(Input.GetKeyDown(KeyCode.Q)){ //if you press 'q'

     if(Vector3.Distance(transform.position, Object1.position) < dist) //if distance is less than dist variable

     {

         isHolding = !isHolding; //changes isHolding var from false to true 

         }

         }



 if(isHolding == true){

     Object1.rigidbody.useGravity = false; //sets gravity to not on so it doesn't just fall to the ground


     Object1.parent = SpawnTo; //parents the object


     Object1.transform.position = SpawnTo.transform.position; //sets position


     Object1.transform.rotation = SpawnTo.transform.rotation; //sets rotation

     }

     else{ //if isHolding isn't true

         SpawnTo.transform.DetachChildren(); //detach child (object) from hand

         Object1.rigidbody.useGravity = true; //add the gravity back on

     }
 }
 </pre>

Now, I'd like to add it so that I cannot pick the Object up without looking directly at it (OnMouseOver). But I don't know how to do this, I've tried replacing function Update (){ with OnMouseOver (){ but then the Object doesn't follow the player properly.