Hjælp til at finde fejl i Script

Jeg har nedenstående script i min header, men det giver denne fejlmelding:

'document.image.slide.style' er null eller ikke et objekt.
Hvad er der galdt?

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var slideSpeed = 3300;
var crossDuration = 10;
var Pic = new Array();
Pic[0] = 'images/tilb-2.jpg'
Pic[1] = 'images/tilb-3.jpg'
Pic[2] = 'images/tilb-4.jpg'
var ttt;
var jjj = 0;
var ppp = Pic.length;
var preL = new Array();
for (iii = 0; iii < ppp; iii++) {
preL[iii] = new Image();
preL[iii].src = Pic[iii];
}
function runSlide() {
if (document.all) {
document.images.Slide.style.filter="blendTrans(duration=2)";
document.images.Slide.style.filter="blendTrans(duration=crossDuration)";
document.images.Slide.filters.blendTrans.Apply();
}
document.images.Slide.src = preL[jjj].src;
if (document.all) {
document.images.Slide.filters.blendTrans.Play();
}
jjj = jjj + 1;
if (jjj > (ppp - 1)) jjj = 0;
ttt = setTimeout('runSlide()', slideSpeed);
}
//  End -->
</script>