addEvent(window, 'load', initCorners);
  function initCorners() {
    var square = {
      tl: { radius: 10 },
      tr: { radius: 10 },
      bl: { radius: 10 },
      br: { radius: 10 },
      antiAlias: true
    }
    var right_only = {
      tl: { radius: 0 },
      tr: { radius: 10 },
      bl: { radius: 0 },
      br: { radius: 10 },
      antiAlias: true
    }
    var left_only = {
      tl: { radius: 10 },
      tr: { radius: 0 },
      bl: { radius: 10 },
      br: { radius: 0 },
      antiAlias: true
    }
    curvyCorners(square, ".square");
    curvyCorners(right_only, ".right_only");
    curvyCorners(left_only, ".left_only");
  }