text: $(document).ready(function() {
      var movementStrength = 25;
      var height = movementStrength / $(window).height();
      var width = movementStrength / $(window).width();
      $("body").mousemove(function(e){
          var pageX = e.pageX - ($(window).width() / 2);
          var pageY = e.pageY - ($(window).height() / 2);
          var newvalueX = width * pageX * -1 - 25;
          var newvalueY = height * pageY * -1 - 50;
  
          if(window.outerWidth > 800)
              $('#banner').css("background-position", newvalueX+"px     "+newvalueY+"px");
      });
  });