RewriteEngine On
RewriteCond %{HTTP_REFERER} !^ http://www.abc123.cn/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^ http://www.abc123.cn$ [NC]
RewriteCond %{HTTP_REFERER} !^ http://abc123.cn/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^ http://abc123.cn$ [NC]
RewriteRule .*\.( gif|jpg|swf )$ http://www.abc123.cn/test.png [R,NC]
RewriteCond %{HTTP_REFERER} !^ http://www.abc123.cn/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^ http://www.abc123.cn$ [NC]
RewriteCond %{HTTP_REFERER} !^ http://abc123.cn/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^ http://abc123.cn$ [NC]
RewriteRule .*\.( gif|jpg|swf )$ http://www.abc123.cn/test.png [R,NC]
