private void setButtonImage(int prev, int next) {
        switch (prev) {
            case OPTION_BUTTON:
                buttons[prev].setImage(optionunselect, 150, 35);
                break;
            case PLAY_BUTTON:
                buttons[prev].setImage(playunselect, 150, 35);
                break;
            case QUIT_BUTTON:
                buttons[prev].setImage(exitunselect, 150, 35);
                break;
            case SHOP_BUTTON:
                buttons[prev].setImage(shopunselect, 150, 35);
                break;
        }
        switch (next) {
            case OPTION_BUTTON:
                buttons[next].setImage(optionselect, 150, 35);
                break;
            case PLAY_BUTTON:
                buttons[next].setImage(playselect, 150, 35);
                break;
            case QUIT_BUTTON:
                buttons[next].setImage(exitselect, 150, 35);
                break;
            case SHOP_BUTTON:
                buttons[next].setImage(shopselect, 150, 35);
                break;
        }

    }