I believe you can replace "slider_holder.gif" in images with another .GIF containing your Slideshow. If you don't want the .GIF to be named slider_holder, you can go into 'css' and open 'main.css'.
Press CTRL+F and enter in 'background:url(../images/slider_holder.gif);', and change slider_holder.gif to your_desired_name.gif.
I may be wrong though. If it works, congratulations. This is untested by me, so, I apologize if it does not work.