DOM Image Rollover v3.0 (a DD script)

[a_design_interactive]

Hi there. I wanted to try the DOM Image Rollover on my site, but i can't figure out where i'm supposed to put my custom data.

not including the browser ID code, as far as i can tell, this is the extent of the "do-stuff with imagesf" part of the script:

var imgarr=document.getElementsByTagName('img');
	var imgPreload=new Array();
	var imgSrc=new Array();
	var imgClass=new Array();
	for (i=0;i<imgarr.length;i++){
		if (imgarr[i].className.indexOf('domroll')!=-1){
			imgSrc[i]=imgarr[i].getAttribute('src');
			imgClass[i]=imgarr[i].className;
			imgPreload[i]=new Image();
			if (imgClass[i].match(/domroll (\S+)/)) {
				imgPreload[i].src = imgClass[i].match(/domroll (\S+)/)[1]
			}
			imgarr[i].setAttribute('xsrc', imgSrc[i]);
			imgarr[i].onmouseover=function(){
				this.setAttribute('src',this.className.match(/domroll (\S+)/)[1])
			}
			imgarr[i].onmouseout=function(){
				this.setAttribute('src',this.getAttribute('xsrc'))
			}

i stuck this on my site, and i've got that other bit in the page-- but no where that i can see is it explained where i want to enter the image data for my unique situation. i'm inclined to look for an image place-holder example in the code, but i see none. not that it MUST, but i'm used to it for example, sometmes example code would have something like:

"sample.gif" is our image and "samplehover.gif" is our hover...

is there more than one page to the tutorial i'm missing somehow? or is there an "understood" aspect to these scripts (ie. a common lingo to the variables represented?) that I, as a fair-weather dynamic-driver, am not aware?

thanks!!

(aside: actually-- this DOM swapper-- seems a bit "unusual". i went for it because of the attention-to-scalability factor. i wonder what is your favorite dynamic swapper script-- for the simple purpose as an anti-spam text-as-img media swapper?)