// JavaScript Document
var Slides = new Array('http://www.biblioteca-gravina.ct.it/images/gif/MapRender_big_01.gif','http://www.biblioteca-gravina.ct.it/images/gif/MapRender_big_02.gif','http://www.biblioteca-gravina.ct.it/images/gif/MapRender_big_03.gif');

function CacheImage(ImageSource) { 
   var ImageObject = new Image();
   ImageObject.src = ImageSource;
   return ImageObject;
}

function ShowSlide(Direction) {
   if (SlideReady) {
      NextSlide = CurrentSlide + Direction;
      
      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); 
   return true;
}

function CacheNextSlide() {
   if (('NextSlide'<'Slides.length')&&(typeof Slides[NextSlide] == 'string'))
{ // ONLY CACHES THE IMAGES ONCE
      SlideReady = false;
      self.defaultStatus = 'Sto caricando la prossima immagine...';
      Slides[NextSlide] = CacheImage(Slides[NextSlide]);
      Download();
   }
   return true;
}

function StartSlideShow() {
   CurrentSlide = -1;
   Slides[0] = CacheImage(Slides[0]);
   SlideReady = true;
   ShowSlide(1);
}