Is it actually an advert you're blocking or something the site should fix? If it were to be blocked it should be either be in a personal list, or a list for non-adverts.
This script is animating an advert that has been blocked already - and it cannot deal with it. The good news is that jCarousel project fixed the issue (even before we first noticed it actually, on August 13th). The bad news is that websites don't tend to update scripts as long as they are "working" (see clustrmaps).