Here is an htaccess file that will disallow hot linking to these uploaded files from anyone but the URLS you specify. Copy this to a blank file, name it .htaccess, and drop this into the imagehosting folder. Works for linux servers of course, cant support this, just trying to help anyone who wants to limit these images being seen to only their site/forums.
Code:
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?youralloweddomain1.com(/)?.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?youralloweddomain2.info(/)?.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?youralloweddomain3.info(/)?.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?youralloweddomain4.net(/)?.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?youralloweddomain5.info(/)?.*$ [NC]
RewriteRule .*\.(gif|jpg|jpeg|bmp)$ http://pagetoredirectto.com/index.php [R,NC]