HuskyPup - 7:16 pm on Mar 4, 2012 (gmt 0)

RewriteEngine on
RewriteCond %{HTTP_REFERER} .
RewriteCond %{HTTP_REFERER} !^google\.com [NC]
RewriteCond %{HTTP_REFERER} !^bing\.com [NC]
RewriteCond %{HTTP_REFERER} !^yahoo\.com [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?example\.com [NC]
RewriteRule .*\.(gif|jpe?g|png)$ /images/hotlink.gif [L]


Substitute example for your website name.

If you want to allow any more of your sites access simply use:

RewriteCond %{HTTP_REFERER} !^http://(www\.)?secondexample\.com [NC]

RewriteCond %{HTTP_REFERER} !^http://(www\.)?thirdexample\.com [NC]

Change .com for whatever your extension is.

Since I implemented the above I have had zero problems.

Good luck!