nsIntPoint oldMousePos = mMousePos;
  mMousePos = eventPoint + WidgetToScreenOffset();

  mMovement.x = mMousePos.x - oldMousePos.x;
  mMovement.y = mMousePos.y - oldMousePos.y;

  fprintf(stderr, "Mouse Movement: %d,%d\n", mMovement.x, mMovement.y);

  if (mMouseLock == true) {
      RECT windowRect;
      ::GetWindowRect(mWnd, &windowRect);
      bool mouseChanged = false;
      if (mMousePos.x != windowRect.right/2) {
        mMousePos.x = windowRect.right/2;
        mouseChanged = true;
      }
      if (mMousePos.y != windowRect.bottom/2) {
        mMousePos.y = windowRect.bottom/2;
        mouseChanged = true;
      }
      if (mouseChanged == true)
        SetCursorPos(mMousePos.x, mMousePos.y);
      fprintf(stderr, "In nsWindow::DispatchMouseEvent\nCursor: %d,%d\nLast: %d,%d\n\n", mMousePos.x, mMousePos.y, oldMousePos.x, oldMousePos.y);
  }