Changing applet color and Filling Jslider

[Terry56]

Hi to all,
Hope all will be fine. Actually i want to ask that how can i change the applet color. By google i found that use

setBackground(Color.Blue) // or whatever color you want

In the init() method but its not working. I also put this is paint() method but still no result . Actually i gave my recorder applet the window look and feel by putting the code

   static {
            try {
               UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            }catch (Exception ex) {
               ex.printStackTrace();
            }
    }

When you see the attachment the applet is of gray color and on another computer is of windows like yellow color. If i want to change the color how can i do it please guide me.

Also in the recorder you see when slider moves the space it's left from its left is empty i want to fill it with some color. I used the code

 progressSlider = new JSlider(SwingConstants.HORIZONTAL, 0, TOTAL_MINS * 60, 0);
 progressSlider.putClientProperty("JSlider.isFilled", Boolean.TRUE);

but it is not working also, so please tell me how can i fill the slider with some color from it's left when it is moving.

Thanks in advance