question re JavaScript

Hello........

I have a question for the JavaScript gurus on the list. (Please bear in mind
that about all I know about JavaScript are snippets that I borrow from this
friend or that website; I know nothing about writing it.)

I made a mouse-over image for one of my sites, and inserted a piece of
script that I found in a book to make it work. Well, it works, but it
changes once and then doesn't change back. I want the image to change
whenever the mouse is passed over it. I would greatly appreciate it if
someone could take a look at it and tell me what's wrong.

The image in question is the banner at the top of this page...
http://www.geocities.com/ussknight4141/index.html

Again, thanks a lot,
Dusty

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