var thisPic = 1;

  function prev() {
    if (thisPic > 1) {
	thisPic--
	document.photo.src = "images/keto-" + thisPic + ".jpg"
	} else {
	thisPic = 12
	document.photo.src = "images/keto-" + thisPic + ".jpg"
    }
  }

  function next() {
  if (thisPic < 12) {
	thisPic++
	document.photo.src = "images/keto-" + thisPic + ".jpg"
	} else {
	thisPic = 1
	document.photo.src = "images/keto-" + thisPic + ".jpg"
	}
  }

function slideShow() {
  if (thisPic < 12) {
	thisPic++
	document.photo.src = "images/keto-" + thisPic + ".jpg"
	} else {
	thisPic = 1
	document.photo.src = "images/keto-" + thisPic + ".jpg"
	}
	timerID=setTimeout('slideShow()',7000);
}

function stop() {
	clearTimeout(timerID);
}