var num=5; // number of slides
 if (document.images){
  img = new Array();
  for ( i=1 ; i <= num ; i++ ){
   img[i]=new Image();
   img[i].src="Sites Gallery Pictures/"+i+".jpg";
  }
 }
 
 function change(n)
 {
  if (document.images){
   next = n ++;
  if (n > num) n = 1;
   document.images['slides'].filters.item(0).Apply();
   document.images['slides'].src=img[n].src;
   document.images['slides'].filters.item(0).Play(); 
   setTimeout("change(" + n + ")",5000); // Adjust the speed here: 3000 = 3 seconds
  }
 }