Block certain domains via htacess

[Jel]

Hmm, can't get this to work - I have:

RewriteEngine on
RewriteCond %{HTTP_REFERER} ^http(s)?://(www\.)?fatfred.com.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^http(s)?://(www\.)?i5sex.com.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^http(s)?://(www\.)?gratis6.dk.*$ [NC]
RewriteRule .* google.com [L]

But can still get to my galleries from their pages.

*edited to add:

Just noticed the code I was generated differed slightly to the example posted by xxxtreme so I made it [R,L] on the bottom line, but that hasn't cured it, so I'm stuck lol.