[jQuery] Problem with Jcarousel and Safari: next button disabled

Hi,
please check out http://www.mirox-media.com/blog_add/media/data/film_festivals.html
When loading it the first time into safari, the "next" button and the
dot array at the top are disabled.
It works only if you click on the refresh button in safari a couple of
times.
Can anyone help??
thank you very much,
Matthias