+1  A: 

Ok so here are a few things I noticed that were wrong with the code you posted. After I fixed these it did work in IE.

First your advertising div is missing a closing quote after the class name. Second your li's all are using the same name which is probably something you are aware of already since you said it worked in others. I would check the missing quote to start. Because like I said it is working for me.

spinon
Hi, this is actually just an error with the code I posted. The classes are added dynamically and the missing quotation is present in the original file. The fact that it did work for you is interesting though. I tested in ie6, 7, and 8. Are you using 9?
David Woolf
No I am using IE 8. Here is the code that I have working for me. I should note I am using jquery 1.3.2.http://pastebin.com/484qGUjD
spinon
hmm, i can't seem to get the same results. If you can get it to work though, this makes me think that it is on the html/php side. Right now there are some if/else statements and variables being used that might be the problem. Thanks for the help.
David Woolf
Yeah no worries.
spinon