Parallax image background based on screen position

Feature Requests
3

Thanks @DBear

this is a very basic code but it works well.
you can change direction and speed

$(window).scroll(function(e){
  parallax();
});
function parallax(){
  var scrolled = $(window).scrollTop();
  $('.parallax').css('margin-top',-(scrolled*0.25)+'px');     
}