I'm also looking for a solution to a similar problem I'm having. I'm using Facebox to load modal popups. Then, using jquery, I'm swaping before/after images when you hover over the image which is loaded in the modal popup. Everything works fine except for the before/ after hover effect. This works in all tested browsers except Safari and Chrome. It looks like Safari may not even be executing the code. I did a try/catch with a simple jquery line, and I don't get the error, but I also don't get the effect.
Anyone know what to do?