How to detect if mouse is over GUI element in Web Player?

Hey guys,

how can I detect wether the cursor is hovering over GUI box (I know its Rect) in the Web Player?

I've tried this:

  Vector2 mousePos = new Vector2(Input.mousePosition.x, Camera.main.pixelHeight -  Input.mousePosition.y);
  if (boxRect.Contains(mousePos)) { Debug.Log("Inside"); }

It works fine in editor but does not do anything in Web Player buid. Any idea how to solve it?