Full Background Auto Refresh Image

What I am trying to do: A full screen background image, that auto refreshes every 3 seconds.
How I am doing it: I am using EvoCam for my camera software. It uploads the image to my server every 3 seconds, perfectly fine. I am using "Back Stretch" for my full screen capabilities, as I found it to work best is all browsers. BackStretch

My Problem: Using backstretch, applies the background image to the page through javascript, so I dont have an <img> tag to manipulate. A lot/all of the image refresh scripts I have found, use examples where there is an <img> tag. I had used another jQuery method of doing the background that had image tags but did not work in all browsers. When I was using this method, I ran into cache problems where the new image would not load.

Where do I go? I am feeling a bit lost, being relatively new to Javascript, I am unsure of how to go about clearing these problems I have. I feel that the eventual answer is to timestamp the photos, and include the timestamp into the image refresh, and somehow make it so that I am refreshing the
Code:
<pre><code><script type="text/javascript">
$.backstretch("images/myCam.gif", {speed: 1});
</script>
</code></pre>
that controls my background image. I have found scripts that include timestamp refreshes, but the way that EvoCam timestamps the image is of a different format than the way Javascript uses

EvoCam images look like: webcam2011-05-11-16-21-34.jpg
and I thought Javascript looks relatively the same, but without the dashes.
I have a test page set up, where you can see my surly, discouraged face [URL].