[final kaoss]

Thanks but I found a better way to prevent hotlinking. From here.
http://perishablepress.com/creating-...king-strategy/

###############################
# ultimate hotlink protection #
###############################

# disable directory browsing
# uncomment this option to protect access to directories
# Options -Indexes

# enable the following of symlinks
# uncomment this option if hotlink protection fails to work
# Options +FollowSymLinks

# verify presence of mod rewrite
<IfModule mod_rewrite.c>

 # enable the rewrite engine
 RewriteEngine on

 # check that file exists
 RewriteCond %{REQUEST_FILENAME} -f

 # check for requested file types
 # include additional file types here
 RewriteCond %{REQUEST_FILENAME} \.(gif|jpe?g?|png)$                [NC]

 # allow blank referrer requests
 RewriteCond %{HTTP_REFERER}     !^$

 # allow all requests from your domain
 # edit the domain to match your own
 RewriteCond %{HTTP_REFERER}     !^https?://([^.]+\.)?domain\.      [NC]

 # allow all requests from your ip address
 # edit the ip address to match your own
 RewriteCond %{HTTP_REFERER}     !^https?://123\.123\.123\.123(.*)$ [NC]

 # additional site access
 # include additional sites here replace domain names and or 
 # remove unnecessary lines or add new lines for more sites
 RewriteCond %{HTTP_REFERER}     !^https?://([^.]+\.)?domain_01\.   [NC]
 RewriteCond %{HTTP_REFERER}     !^https?://([^.]+\.)?domain_02\.   [NC]
 RewriteCond %{HTTP_REFERER}     !^https?://([^.]+\.)?domain_03\.   [NC]

 # search engine access
 # include or remove search engines feed readers and other sites
 RewriteCond %{HTTP_REFERER}     !search\?q=cache                   [NC]
 RewriteCond %{HTTP_REFERER}     !google\.                          [NC]
 RewriteCond %{HTTP_REFERER}     !yahoo\.                           [NC]

 # allow access to all requests for your anti hotlink image
 # to serve an image instead of delivering a 403 error
 # uncomment the next line and edit the path and file name
 # RewriteCond %{REQUEST_URI}    !^/hotlink\.jpg$                   [NC]

 # deliver the hotlink image for all requests for the listed files
 # protect additional file types by editing the list below
 # if you are serving a file instead of a 403 
 # uncomment the next line and edit the path and file name
 # RewriteRule \.(gif|jpe?g?|png)$ http://domain.tld/hotlink.jpg    [R,NC,L]

 # return a 403 error when any of the following file types is requested
 # you can protect additional file types by editing the list below
 RewriteRule \.(gif|jpe?g?|png)$                                  - [F,NC,L]

# close the module container
</ifModule>