<div className="mac_os8_scroll_bar">
                <div onClick={this.tabScroll.bind(this, 'up')}
                     className="mac_os8_scroll_tab mac_os8_sprites up" />
                <div onClick={this.tabScroll.bind(this, 'down')}
                     className="mac_os8_scroll_tab mac_os8_sprites down" />