hotlink protection for wordpress

[Max]

Hello,

I tried to add some rewrite rule to block hotlinking from other web sites.
But the rules don't work, I go to my site (e.g. domain1.com), the images
won't load at all (using wordpress as the cms). Is there anything wrong for
my conf file? Thanks.

server {
        listen      123.123.123.123:80;
        server_name domain1.com www.domain1.com;

        #charset koi8-r;

        access_log  /home/logs/domain1.com.log;
    error_log /home/logs/domain1.com.error.log;

        location / {
            root   /home/user/docs;
            index  index.php index.html index.htm;
            include /usr/local/nginx/conf/wp-rewrite;
}

 location ~ \.(jpg|jpeg|png|gif)$ {
       valid_referers www.domain1.com blocked none;
               if ($invalid_referer) {
                       rewrite  ^(.*)$ /wp-content/uploads/av.gif break;
               }
       }

        location /zp {

            root   /home/user/docs;
            index  index.php;
            include /usr/local/nginx/conf/zp-rewrite;
        }


        error_page  404              /404.html;
        location = /404.html {
            root   /usr/local/nginx/html;
        }

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   /usr/local/nginx/html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ \.php$ {
            root           /home/user/docs;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME
/home/user/docs$fastcgi_script_name;
            include        fastcgi_params;
        }

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        location ~ /\.ht {
            deny  all;
        }
    }
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