// slideshow: grabs divs of class 'slide' and rotates them sequentially.
 
 function start_slideshow(start_frame, end_frame, delay) {
   setTimeout(switch_slides(start_frame,start_frame,end_frame, delay), delay);
 }
                         
 function switch_slides(frame, start_frame, end_frame, delay) {
  return (function() {
  Effect.Fade('slideshow' + frame);
  if (frame == end_frame) { frame = start_frame; } else { frame = frame + 1; }
  setTimeout("Effect.Appear('slideshow" + frame + "');", 1000);
  setTimeout(switch_slides(frame, start_frame, end_frame, delay), delay + 0);
  })

 }