[рони]

VictorHub,

var animated_element = document.getElementById('bg');

  var frame_width = animated_element.offsetWidth;
  var total_frames = 4;
        var frame_count = 0;

var timer = setInterval(function(){

       var new_x = (frame_count * frame_width) * -1;
       animated_element.style.backgroundPosition = new_x+'px 0px';

       if (frame_count < total_frames){
        frame_count += 1;
        }else{
        window.clearTimeout(timer)
        }


      },400);