However, IE9 and up, it's not working at all. I don't know anything about JS so I'm at a loss as to what the problem is or what could be causing it. I tried contacting the original creator of the JS code at CoolWebDeveloper, but his last post was in 2009 so I'm not expecting much back on that.
The owners of the site use IE9, and IE exclusively for that matter, so they think that the slideshow isn't working ever for anyone coming to the site and are very anxious to get it fixed. I've read that IE9 reads and interprets Java differently than older browsers but with my non-JS knowledge, that doesn't help me much.
I don't want to post the entire code, as guidelines suggested I not, but I don't know what part of or where in the code the problem is coming from. The site is: