I’m making a game that requires you to pick up a puzzle piece and I am having trouble making it so it picks up off a key click. Help please 
var size : Vector2 = new Vector2(400,100); // Setting size of box
var hand : Transform; // give the object inthe hierarchy a variable
var cube : Transform;
var hitbox : GameObject;
var tripwire = false; // variable is used for telling if the character is in or out of the collider
function Start () // Program will find the objects no matter where they are at or in what program
{
}
function Update ()
{
}
function OnGUI () //Builds the Box with the message to pickup item using the tripwire variable
{
if (tripwire == true)
{
GUI.Box(Rect (200,275, size.x, size.y), "Press E to pick up the puzzle piece!");
}
}
function OnTriggerEnter (col : Collider) // decides if player is in the box or not and displays message and gives the option to pick the item
{
if (col.gameObject.name == "Player")
{
if(Input.GetButtonDown (KeyCode.E))
{
transform.parent = hand.transform;
transform.position = hand.transform.position;
}
tripwire = true;
}
}
function OnTriggerExit (col : Collider) // removes box from screen and opton to pick up item
{
if (col.gameObject.name == "Player")
{
tripwire = false;
}
}