addEvent(window, 'load', initCorners);

  function initCorners() {
    var settings_def = {
      tl: { radius: 8 },
      tr: { radius: 8 },
      bl: { radius: 8 },
      br: { radius: 8 },
      antiAlias: true
    }

    curvyCorners(settings_def, "#mainmenu ul");
  }