Effect.BlindLeft = function(element) {
  element = $(element);
  element.makeClipping();
  return new Effect.Scale(element, 0,
    Object.extend({ scaleContent: false,
      scaleY: false,
      scaleMode: 'box',
      scaleContent: false,
      restoreAfterFinish: true,
      afterSetup: function(effect) {
        effect.element.makeClipping().setStyle({
          height: effect.dims[0] + 'px'
        }).show();
      },
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping();
      }
    }, arguments[1] || { })
  );
};