function CacheImage(ImageSource) {
 var ImageObject = new Image();
 ImageObject.src = _urll + 'include/mostra_thumbnail.asp?path='+ImageSource+'&height=190';
 return ImageObject;
}

function ShowSlide(Direction) {
 if (SlideReady){
  NextSlide = CurrentSlide + Direction;
  // THIS WILL DISABLE THE BUTTONS (IE-ONLY)
  document.SlideShow.Previous.disabled = (NextSlide == 0);
  document.SlideShow.Next.disabled = (NextSlide == (Slides.length-1));    
  if ((NextSlide >= 0) && (NextSlide < Slides.length)) {
   document.images['Screen'].src = Slides[NextSlide].src;
   CurrentSlide = NextSlide++;
   Message = 'Picture ' + (CurrentSlide+1) + ' of ' + Slides.length;
   self.defaultStatus = Message;
   if (Direction == 1) CacheNextSlide();
  }
  return true;
 }
}

function Download() {
 if (Slides[NextSlide].complete) {
  SlideReady = true;
  self.defaultStatus = Message;
 }
 else setTimeout("Download()", 100); // CHECKS DOWNLOAD STATUS EVERY 100 MS
 return true;
}

function CacheNextSlide() {
 if ((NextSlide < Slides.length) && (typeof Slides[NextSlide] == 'string')){ // ONLY CACHES THE IMAGES ONCE
  SlideReady = false;
  self.defaultStatus = 'Downloading next picture...';
  Slides[NextSlide] = CacheImage(Slides[NextSlide]);
  Download();
 }
 return true;
}
function StartSlideShow() {
 CurrentSlide = -1;
 Slides[0] = CacheImage(Slides[0]);
 SlideReady = true;
 ShowSlide(1);
}