Options +FollowSymlinks
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?jefflindsay.com(/)?.*$     [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mormanity.blogspot.com(/)?.*$     [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?sanity.blog-city.com(/)?.*$     [NC]
RewriteRule .*\.(gif|jpg|jpeg|bmp)$ - [F,NC]