var slide_sptspeed  = 4000; // it means 5 seconds
var slide_sptimages = new Array("/ast/img/head4.jpg");var imageholder = new Array();
var ie55        = window.createPopup;
var whichlink   = 0;
var whichimage  = 0;
var pixeldelay  = (ie55) ? document.images.slide_spt.filters[0].duration * 1000 : 100;

for (i=0;i<slide_sptimages.length;i++){
  imageholder[i]=new Image();
  imageholder[i].src=slide_sptimages[i];
}

function slide_sptit(){
  if (!document.images) return;

  if (ie55) document.images.slide_spt.filters[0].apply();

  document.images.slide_spt.src = imageholder[whichimage].src;

  if (ie55) document.images.slide_spt.filters[0].play();

  whichlink  = whichimage;
  whichimage = (whichimage < slide_sptimages.length-1) ? whichimage+1 : 0;

  setTimeout("slide_sptit()",slide_sptspeed+pixeldelay);
}

slide_sptit();