Hi Shauna,
sorry to say I have no clue why it's not working on IE (except that IE is really bad but that doesn't help you).
If you get a chance to, could you check whether my slideshows work on IE?
http://iwebfaq.org/sample/iWeb_Auto_fading_photos.htmlBecause I remember them to be perfectly working when I checked them at work and at school on IE (unfortunately or fortunately I have no other access to Windows machines)
In the past I've seen it not to be working when people added a comma after the last picture but in your case that's not the problem.
Regards,
Cédric