Ajax POST error 405

[Ferenc-lorant Kiss]

Ijust installed ngnix on my server. All rail applications works perfect,
but i have some static sites where i use AJAX for content replacement
and i get 405 Not allowed error.
Server config:
  server {
    listen       80;
    server_name  www.clean-tech.ro clean-tech.ro ;

    access_log /srv/www/vhosts/clean-tech/www/log/nginx.log main;

    location / {
      root /srv/www/vhosts/clean-tech/www;
      index  index.html index.htm;
    }
    #error_page  404              /404.html;

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
      root   /srv/www/htdocs/;
    }

  }
I tried
    error_page   405   = @405;
    location = @405 {
         root   /srv/www/vhosts/clean-tech/www;
     }
 but after this workaround i get error 500

Headers:
Host  clean-tech.ro
User-Agent  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.9)
Gecko/20071101 SUSE/2.0.0.9-2.1 Firefox/2.0.0.9
Accept  text/javascript, text/html, application/xml, text/xml, */*
Accept-Language  en-us,en;q=0.5
Accept-Encoding  gzip,deflate
Accept-Charset  ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive  300
Connection  close
X-Requested-With  XMLHttpRequest
X-Prototype-Version  1.5.0_rc1
Content-Type  application/x-www-form-urlencoded
Referer  http://clean-tech.ro/
Content-Length  0
Cookie
__utmz=240299857.1195540804.10.5.utmccn=(referral)|utmcsr=blog.hkcc.ro|utmcct=/2007/11/16/test|utmcmd=referral;
__utma=240299857.1171685038.1191992038.1195504186.1195540804.10;
__utmb=240299857; __utmc=240299857
Pragma  no-cache
Cache-Control  no-cache
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