Safari problem

Safari problem

Hi all I'm pretty new to jquery and have made a site for a friend.

My problem is that we have an annoying bug in safari.

We have some thumbsnails to diffrent photo sessions, where the site fades from the frontpage to the gallaries. But in safari the pictures disappear when scrolling right??

Ok this is hard to explain so here's a link:
http://www.mumilab.com/MUMILAB4/

Any help will really be appreciated :)