var rotate_delay = 2000; // delay in milliseconds (2000 = 2 secs)
  current = 0;

  function next() {
  if (document.slideform.slide[current+1]) {
  document.images.show.src = document.slideform.slide[current+1].value;
  document.slideform.slide.selectedIndex = ++current;
  }
  else first();
  }

  function previous() {
  if (current-1 >= 0) {
  document.images.show.src = document.slideform.slide[current-1].value;
  document.slideform.slide.selectedIndex = --current;
  }
  else last();
  }

  function first() {
  current = 0;
  document.images.show.src = document.slideform.slide[0].value;
  document.slideform.slide.selectedIndex = 0;
  }

  function last() {
  current = document.slideform.slide.length-1;
  document.images.show.src = document.slideform.slide[current].value;
  document.slideform.slide.selectedIndex = current;
  }

  function ap(text) {
  document.slideform.slidebutton.value = (text == "Stop") ? "Start" : "Stop";
  rotate();
  }

  function change() {
  current = document.slideform.slide.selectedIndex;
  document.images.show.src = document.slideform.slide[current].value;
  }

  function rotate() {
  if (document.slideform.slidebutton.value == "Stop") {
  current = (current == document.slideform.slide.length-1) ? 0 : current+1;
  document.images.show.src = document.slideform.slide[current].value;
  document.slideform.slide.selectedIndex = current;
  window.setTimeout("rotate()", rotate_delay);
    }
  }