ServerAdmin master@aaa.com
DocumentRoot /home/~/public_html/
ServerName aaa.com
ServerAlias www.aaa.com
SetEnvIfNoCase Referer aaa.com link_allow
SetEnvIfNoCase Referer www.aaa.com link_allow
SetEnvIfNoCase Referer ^$ link_allow
<FILESMATCH ?.(gif|jpg|wmv)$?>
Order Deny,Allow
Allow from env=link_allow
Deny from all
</FILESMATCH>
</VIRTUALHOST>