background = Bitmap.getBitmapResource("MyBackground.jpg");
HorizontalFieldManager myHFM = new HorizontalFieldManager(HorizontalFieldManager.NO_HORIZONTAL_SCROLL | HorizontalFieldManager.NO_VERTICAL_SCROLL | Manager.USE_ALL_HEIGHT) {
    //Override the paint method to draw the background image.
    public void paintBackground(Graphics graphics) {
        int startX = 0;
        int startY = 0;
                
        // Determine where to center image
        if (this.getVisibleWidth() > background.getWidth()) {
            startX = (this.getVisibleWidth() - background.getWidth()) / 2;
        }
        if (this.getVisibleHeight() > background.getHeight()) {
            startY = (this.getVisibleHeight() - background.getHeight()) / 2;
        }
                                
        //Draw the background image and then call paint.
        graphics.drawBitmap(startX, startY, background.getWidth(), background.getHeight(), background, 0, 0);
                
        super.paintBackground(graphics);
    }
};