RewriteEngine On
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^
http://70.84.11.222/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^
http://camelthumbs.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^
http://www.camelthumbs.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^
http://www.camelthumbs.com/ambersass.html.*$ [NC]
RewriteRule .*\.(gif|jpg|zip)$ - [F,L]
Fill in your site info where mine is put a file name .htaccess in your root directory