Nivo Slider not working in Safari, Chrome

I downloaded a free theme from a third party that included Nivo Slider and custom styling for it. It works great in Firefox, but when I try to view my site in Safari and Chrome, The photos don’t appear, although the frame and nav arrows show up.

I went back and viewed the live demo of the theme in those two browsers, and the slider works fine then. So I’ve gone back and undone several of the changes I’ve made to the theme–thinking maybe I goofed something up–but that didn’t make a difference.

Here’s the site: wedelcafe.com

Help?