counter = 0;
imgPath = "/images/hardware/GRCU_Scanner_web_";

document.Preload = new Array();
if(document.images) {
  for(var i=0; i < 6; i++) {
    document.Preload[i] = new Image();
    document.Preload[i].src = imgPath + i + ".jpg";
  }
}

function animate() {
  document.getElementById("animation").src = document.Preload[counter].src;
  if (counter%2 == 0) restart = setTimeout("animate()", 5000);
  else restart = setTimeout("animate()", 250);
  counter++;
  if (counter > 5) counter = 0;
}