Step 1: Add the below into the <head> section of your page:

<script language="JavaScript">

//Preloaded slideshow script- By Jason Moon (webmaster@jasonmoon.net)

// PUT THE URL'S OF YOUR IMAGES INTO THIS ARRAY...
var Slides = new Array('image1.gif','image2.gif','image3.gif');

// DO NOT EDIT BELOW THIS LINE!
function CacheImage(ImageSource) { // TURNS THE STRING INTO AN IMAGE OBJECT
   var ImageObject = new Image();
   ImageObject.src = ImageSource;
   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);
}
</script>

Step 2: Insert the following where you wish the slideshow to appear in the BODY:

<form name="SlideShow">
<table>
<tr>
   <td colspan=2><img name="Screen" width=108 height=135></td>
</tr>
<tr>
   <td><input type="button" name="Previous" 
value=" << "
onClick="ShowSlide(-1)"></td>
   <td align="right"><input type="button" name="Next"
value=" >> " onClick="ShowSlide(1)"></td>
</table>
</form>

You should change the width/height attributes inside the <IMG> to the dimensions of the first image.

Step 3: Finally, inside the BODY tag itself, add this event handler:

<body onLoad="StartSlideShow()">
