SMF Version: SMF 1.1.1
IS possible make this:
When somebody post one image that is not visible or have not valid link and show red cross (https://www.simplemachines.org/community/proxy.php?request=http%3A%2F%2Fm1.freeshare.us%2F155fs970716.jpg&hash=aead078b053129dd3dd4d389d38e5112da0000b5).
Smf post one word for tell "Url not valid" or something similar and not the little cross.