imageParallax

gistfile1.txt

this.imageParallax = function () {
  $(window).scroll(function () {
    var windowPosition = $(window).scrollTop();

    function parallax(topHeight, windowPosition, inertia){
      return topHeight - windowPosition / inertia;
    }

    $('.js-parallax img').css(
      '-webkit-transform', 'translate3d(0, ' + parallax(0, windowPosition, 4) + 'px, 0)'
    )
  })
}