The images are (were) hosted offsite and are no longer there. This is often the problem when people host images elsewhere as opposed to uploading them to the Cafe.
The lesson I learned from Jeroen: make a copy of an interesting tread to your hard disk. Especially when it is good information having pictures that are hosted offsite.
Not only me but probably others too have the complete tread Bram posted. Remember, once you put something on the Internet, it is hard to take it all down.