JButton Help

public class MainMenu extends JFrame {

	private JPanel contentPane;

	/**
	 * Launch the application.
	 */

	//variables
	public static Image bg;

	public static void main(String[] args) {

					MainMenu mainFrame = new MainMenu();
					mainFrame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
					mainFrame.setResizable(false);
					mainFrame.setLocationRelativeTo(null);
					mainFrame.setTitle ("Zumby");
					mainFrame.setLayout(null);

					// Loads the background image and stores in bg object.
					try {
					    bg = ImageIO.read(new File("zumby.png"));
					} catch (IOException e) {
					}
					mainFrame.setVisible(true);
				}


	/**
	 * Overrides the paint method.
	 * MONDAY
	 */
	 public void paint(Graphics g)
	    {
	     // Draws the img to the BackgroundPanel.
		 System.out.println("paint");
	       g.drawImage(bg, 0, 0, null);
	    }

	/**
	 */
	public MainMenu() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 800, 500);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		contentPane.setOpaque(false);
		setContentPane(contentPane);
		contentPane.setLayout(null);

		//create buttons
		JButton btnPlay = new JButton("PLAY");
		btnPlay.setBackground(Color.BLACK);
	    btnPlay.setForeground(Color.WHITE);
	    btnPlay.setFont(font);
	    btnPlay.setBorder(border);
	    btnPlay.setFocusPainted(false);

		//if "Play" is clicked

		btnPlay.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent click) {
				setVisible(false);
				new GamePlay(); //opens up GamePlay window
			}
		});
		btnPlay.setBounds(600, 64, 141, 61);
		contentPane.add(btnPlay);

		JButton btnInstructions = new JButton("INSTRUCTIONS");

		btnInstructions.setBounds(600, 160, 141, 61);
		btnInstructions.setBackground(Color.BLACK);
	    btnInstructions.setFocusPainted(false);
	   // btnInstructions.setEnabled(true);

		contentPane.add(btnInstructions);
		repaint();
		pack();
		setVisible(true);

	}

}