java fader justering

hvorfor ændre crossFadeDuration og slideShowSpeed sig ikke når jeg ændre på parametrene ??? kan den virke på mac ???

eksempel: http://www.thegallery.dk/Gallery/thyra/tr.htm

<script>
// Set slideShowSpeed (milliseconds)
var slideShowSpeed = 4000

// Duration of crossfade (seconds)
var crossFadeDuration = 10000

// Specify the image files
var Pic = new Array()

Pic[0] = \'r1.jpg\'
Pic[1] = \'r2.jpg\'
Pic[2] = \'r3.jpg\'
Pic[3] = \'r4.jpg\'
Pic[4] = \'r5.jpg\'
Pic[5] = \'r6.jpg\'
Pic[6] = \'r7.jpg\'
Pic[7] = \'r8.jpg\'
Pic[8] = \'r9.jpg\'
// =======================================
// do not edit anything below this line
// =======================================

var t
var j = 0
var p = Pic.length

var preLoad = new Array()
for (i = 0; i < p; i++){
  preLoad[i] = new Image()
  preLoad[i].src = Pic[i]
}

function runSlideShow(){
  if (document.all){
      document.images.SlideShow.style.filter=\"blendTrans(duration=crossFadeDuration)\"
      document.images.SlideShow.filters.blendTrans.Apply()     
  }
  document.images.SlideShow.src = preLoad[j].src
  if (document.all){
      document.images.SlideShow.filters.blendTrans.Play()
  }
  j = j + 1
  if (j > (p-1)) j=0
  t = setTimeout(\'runSlideShow()\', slideShowSpeed)
}
</script>