SetEnvIfNoCase Referer "^http://www.your-domain-name-here.com/"
locally_linked=1 
SetEnvIfNoCase Referer "^http://www.your-domain-name-here.com$"
locally_linked=1 
SetEnvIfNoCase Referer
"^http://your-domain-name-here.com/"
locally_linked=1 
SetEnvIfNoCase Referer
"^http://your-domain-name-here.com$"
locally_linked=1 
SetEnvIfNoCase Referer
"^$" locally_linked=1
 <FilesMatch
"\.(gif|png|jpg)$"> 
    Order Allow,Deny 
    Allow from env=locally_linked
 </FilesMatch>