RewriteEngine on

RewriteCond %{HTTP_REFERER} !^http://planetidc.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://planetidc.com$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.planetidc.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.planetidc.com$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.xaoyo.net/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.xaoyo.net$ [NC]
RewriteCond %{HTTP_REFERER} !^http://xaoyo.net/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://xaoyo.net$ [NC]
RewriteRule .*/.(jpg|jpeg|gif|png|bmp|css)$ - [F,NC]

RewriteRule .*/.(jpg|jpeg|gif|png|bmp|css)$ - [F,NC]這句還可以改一下以顯示自己想顯示的錯誤信息

RewriteRule .*/.(jpg|jpeg|gif|png|bmp|css)$ /404.shtml [R,NC,L]