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

function ShowSlide(Dir) 
{
   if (SlideReady) 
   {
      NextSlide = CurrentSlide + Dir;
      // IE only - disable buttons
      document.SlideShow.Previous.disabled = (NextSlide == 0);
      document.SlideShow.Next.disabled = (NextSlide == (Slides.length-1));    
     if ((NextSlide >= 0) && (NextSlide < Slides.length)) 
     {		
            document.images['HousePic'].src = Slides[NextSlide].src;
            CurrentSlide = NextSlide++;
            if (Dir == 1) CacheNextImage();
     }
     return true;
   }
}

function DownloadNextImage() 
{
   if (Slides[NextSlide].complete) 
   {
      SlideReady = true;
   }
   else setTimeout("DownloadNextImage()", 100);
   return true;
}

function CacheNextImage() {
   if ((NextSlide < Slides.length) && (typeof Slides[NextSlide] == 'string'))
   { // ONLY CACHES THE IMAGES ONCE
      SlideReady = false;
      Slides[NextSlide] = CacheNextSlide(Slides[NextSlide]);
      DownloadNextImage();
   }
   return true;
}

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