public void drawTarget (int i, int j)
	{
		copy();
		Graphics g = getGraphics();
		if (g == null) return;
		i = O + OTU + i * D + D / 2;
		j = O + OTU + j * D + D / 2;
		if (GF.bwColor())
			g.setColor(Color.white);
		else g.setColor(Color.gray.brighter());
		g.drawRect(i - D / 4, j - D / 4, D / 2, D / 2);
		g.dispose();
	}