var nextStepDelay = 4500;
  var imgIndex = 0;
  var lastImageNum = 26;
  var extraZero = "";

  function runAnimation() {
    if (imgIndex <= 9) {extraZero = "0";}
    else {extraZero = "";}
    document.hssanimimage.src = "photos/hss"+extraZero+imgIndex+".jpg";
    if (imgIndex < lastImageNum) {imgIndex = imgIndex + 1; nextStepDelay = 4500;}
    else {imgIndex = 0; nextStepDelay = 10000;}
    setTimeout("runAnimation ()", nextStepDelay);
  }