Disable hotlinks for my image host

I want to disable hotlinks on my image host on my big pictures but leave the thumbnails so they can be hotlinked. Now all my thumbnails have _thumb in their name.
I tryed editing the .htaccess file with this

RewriteEngine on

RewriteCond %{HTTP_REFERER} !^$

#allow hotlinking for thumbnails
RewriteCond %{REQUEST_URI} !_thumb

#allowed website to hotlink  (don't forget to add your own site !!)
RewriteCond %{HTTP_REFERER} !^http://(www\.)?domain.com(/)?.*$ [NC]

#display no-hotlink.jpg instead of the requested image
RewriteRule \.(jpg|jpeg|gif|png|bmp|ico)$ http://www.domain.com/no-hotlink.jpg [NC,R,L]

Code (markup):

This did not work, its like my .htaccess does nothing. I blocked all the images in .htaccess and i could still see them on my image host.

So im looking for another way to do this.
Thx for any help guys you might give.

 

Are you using mihalism script ?

send me a pm i can help you.

 

So nobody knows how to help me?

 

I believe, you can get something better on Mihalism Forum

http://www.mihalism.net

Regards