RewriteEngine on
Options All -Indexes 
RewriteCond %{HTTP_REFERER} !^$ [NC]
RewriteCond %{HTTP_REFERER} !augustint.com [NC]
RewriteCond %{HTTP_REFERER} !augustinternational.com [NC]
RewriteCond %{HTTP_REFERER} !youdao.com [NC]
RewriteCond %{HTTP_REFERER} !twitter.com [NC]
RewriteCond %{HTTP_REFERER} !facebook.com [NC]
RewriteCond %{HTTP_REFERER} !google.cn [NC]
RewriteCond %{HTTP_REFERER} !google.com [NC]
RewriteCond %{HTTP_REFERER} !google.com.tw [NC]
RewriteCond %{HTTP_REFERER} !google.com.sg [NC]
RewriteCond %{HTTP_REFERER} !google.com.hk [NC]
RewriteCond %{HTTP_REFERER} !baidu.com [NC]
RewriteCond %{HTTP_REFERER} !soso.com [NC]
RewriteCond %{HTTP_REFERER} !mail.qq.com [NC]
RewriteCond %{HTTP_REFERER} !cn.bing.com [NC]
RewriteCond %{HTTP_REFERER} !image.baidu.com [NC]
RewriteRule .(gif|png|jpg)$ http://www.yziw.net/images/linkeldiy.png [R,NC,L]