here.. i'll bold what you need to change.
<!-- STEP ONE: Paste this code into the HEAD of your HTML document -->
<HEAD>
<script LANGUAGE="JavaScript">
<!-- Begin
// Set up the image files to be used.
var theImages = new Array() // do not change this
// To add more image files, continue with the
// pattern below, adding to the array.
theImages[0] = '1.gif'
theImages[1] = '2.gif'
theImages[2] = '3.gif'
theImages[3] = '4.gif' <-- put the url to the images you want to be shown.. if there's more than 3 then just make another "theImages[4]="image" etc etc..
// do not edit anything below this line
var j = 0
var p = theImages.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
preBuffer[i] = new Image()
preBuffer[i].src = theImages[i]
}
var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+theImages[whichImage]+'">');
}
// End -->
</script>
</HEAD>
<!-- STEP TWO: Copy this code into the BODY of your HTML document -->
<BODY>
<script LANGUAGE="JavaScript">
<!-- Begin
showImage();
// End -->
</script>
the body part is the part after the <body background color.. blah blah
