The avatars are grouped according to theme and put in different folders.
Choose a folder and look at the avatars offered under that theme. File sizes and names are provided.
If you would like to use the avatar at a message forum like "When MT is down ..." (works for Internet Explorer):
Right-click on the picture and choose Properties.
Copy Location (URL) and use it as the address of the avatar at the discussion forum, in Control panel for avatars, where it says, Link to avatar at a different server: Write in the address of your avatar
These avatars were made by the signature 'Mossflower' at NarniaWeb