From looking at your code with
Firebug, it appears you're using "?attachment_id=something" format URLs.. you need to use direct image URLs. The attachment URL goes to a page, and the fader/slider can't load those pages because it's looking for an image. The best way to get the correct URL format is to navigate to the image on your site, either in the media library or on whatever page you've attached it, right click the image, and select "copy image location" or "get image link" or whatever option gets the direct URL to the image.