Mouseover to start javascript slide show

[gaylo565]

Right now I have a mouse over event that swaps pictures. I was hoping to add a timer with events so that as long as the mouse is over the image the jpeg continues to be swapped out going through a basic slide show.
Here is what I have so far for my image setup and swap function:

<script type="text/javascript">
<!--

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		about_us_over = newImage("http://forum.codecall.net/images/about-us-over.jpg");
		services_over = newImage("http://forum.codecall.net/images/services-over.jpg");
		products_over = newImage("http://forum.codecall.net/images/products-over.jpg");
		contacts_over = newImage("http://forum.codecall.net/images/contacts-over.jpg");
		wel2_over = newImage("http://forum.codecall.net/images/wel2-over.jpg");
		po2_over = newImage("http://forum.codecall.net/images/po2-over.jpg");
		preloadFlag = true;
	}
}

</script>

here is the mouseover event call in the html

<td colspan="2" rowspan="2">
<a href="#"
onmouseover="window.status='wel2'; changeImages('wel2', 'images/wel2-over.jpg'); return true;"
onmouseout="window.status=''; changeImages('wel2', 'images/wel2.jpg'); return true;"
onmousedown="changeImages('wel2', 'images/wel2-over.jpg'); return true;"
onmouseup="changeImages('wel2', 'images/wel2-over.jpg'); return true;">
<img name="wel2" src="http://forum.codecall.net/images/wel2.jpg" width="114" height="93" border="0" alt="wel2"></a></td>

I think I am going to need to set up a flag variable for the status of the mouse (in or out of the image) and when the status is changed to in the image I need a timer to start and at a set interval I need to have another switch image function called. I am pretty new to javascript (C# programmer so it looks farmiliar but I get lost when I try to write from scratch) so if someone doesn't mind helping me out a bit I would appreciate it.