function progress_bar(){
  var image_count = $("img").length;
  var image_array = document.getElementsByTagName("img");
  for (var i = 0; i < image_count; i++){
    if (image_array[i].complete)  {
      var new_image_count = image_count - 1;
      document.getElementById("imagecounter").innerHTML = i + ' of ' + new_image_count + ' frames loaded<br />';
    }
  }
  var image_count = image_count;
}