javascript slide show

OK - First, my disclaimer: I'm a noob to Javascript.

So, I'm playing with some java scripts from javascriptkit, and one is a slide show
script. Here's what I don't get:
document.images.slide.src=eval("image"+step+".src")

This is part of the function that selects the next image. My slide show doesn't run, and I'm trying to figure out why. Any suggestions is greatly appreciated.

Dono

my suggestion is to look for another slideshow - even the snippet you have shown suggests that it is ancient and somewhat crapful