Will someone please look at this for me?

http://mullenasphalt.com/photo_gallery.html

I keep getting these pop up js error messages and I have triple checked that all the files are on the ftp server. Does anyone know why this might be happening? I recently designed a site that is basically identical to the one above, and I never got any error messages during the file transfer/web launch. Here it is if you want to reference it: http://www.bobmccainhomes.com/photo_gallery.html

I am really at a loss. Any help is very much appreciated.