Photo's on Websites with ? marks

New to these forums as well as new with a Mac. On a few websites when I look at pictures that were added especially in forums some pictures don't open and they are just a question mark in a little blue box. If anyone has any tips or help i'd greatly appreciate it. Sorry to start a whole thread for this.. Was not sure where to find this questions..

thanks

Those are usually just links to pictures that no longer exist. It's kind of like the box with the little X in it that you would see in Internet Explorer. There's nothing you can do as it's a server side issue.