var original_x_:int = this.x;
var original_y_:int = this.y;
var answer_x_:int;
var answer_y_:int;

parent.addEventListener(MouseEvent.MOUSE_DOWN, DragMe);
parent.addEventListener(MouseEvent.MOUSE_UP, DropMe);

function DragMe(e:MouseEvent):void
{
  this.startDrag();
}
function DropMe(e:MouseEvent):void
{
  this.stopDrag();
  var dist_to_answer_x = this.x - answer_x_;
  var dist_to_answer_y = this.y - answer_y_;
  var acceptable_distance = 25;
  if (dist_to_answer_x * dist_to_answer_x + dist_to_answer_y * dist_to_answer_y < acceptable_distance)
  {
    this.x = answer_x_;
    this.y = answer_y_;
  } else
  {
    this.x = original_x_;
    this.y = original_y_;
  }
}
function AnswerPosition(x:int, y:int)
{
  answer_x_ = answer_x;
  answer_y_ = answer_y;
}