Prevent files hotlinking with .htaccess

Hi,
As being said in topic title, i'd like to prevent hotlinking of files, specifically images from my domain so i googled and ran onto following code snippet:

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com/.*$ [NC]
RewriteRule \.(gif|jpg|js|css)$ - [F]

Code (markup):

Now, i want to know is that good way of doing it?

Also, is that mod_rewrite rule good for me since my domain doesn't have www. prefix (301 redirected) ?

thanks

 

cmon, anyone?