<script language="JavaScript">
<!--
arImageSrc = new Array (
"image.gif",
"image2.gif",
"image3.jpg",
"image4.jpg"
)
arImageList = new Array ();
for (counter in arImageSrc) {
arImageList[counter] = new Image();
arImageList[counter].src =
arImageSrc[counter];
}
// -->
</script>
put the above script into your <head> tag