rollovers stop working with multiple instances?

hi, i am using disjointed rollovers for small photoslide shows in my blog posts. they work fine individually, but when i have multiple instances over several posts, eventually something gives and they all stop working? if anyone has any insight, i’d be grateful.

sample can be found at http://www.leahgauthier.com/sharecropper. everything worked fine before the latest post.

thanks,

leah