Kirupa XML Slideshow tutorial

I recently used the Kirupa XML Slideshow tutorial:

I really loved this. However I now have a need to include another feature. I need to create a fade out/fade transition between the images as it cycles through the XML. At present the image just dissapears and a new one fades in, I need a transition between the two. I have played with the script but to no avail.

If you have any suggestions or any snippets of code I could just drop in to achieve this.
Thanks again for you help. Your website is great and I use it a lot.