I see you replaced sample_pic with one of your own, and that's loading. The images aren't there, at least not where the script is looking to display them:
http://www.bundonis.com/album/IMG_3112.JPG
I also noticed that the thumb for sample_image is not the same as the actual image. Maybe there's a permissions problem with the files or folders?
Another possibility: does album_web point to the same directory as album_dir? One should be the filesystem directory path and the other should be a URL to that same path.