[Proto-Scripty] Autocompleter, URL on different domain

Hi all,

I stumbled into unexpected problem. I got high loaded site, so I want
put URL for response on different subdomain. Problem is, it is not
working, I see:

(Request-Line)  OPTIONS /libs/suggest.php HTTP/1.1
Host    suggest.mydomain.org
User-Agent      Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:
1.9.2.3) Gecko/20100401 Firefox/3.6.3
Accept  text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language en,cs;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset  ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive      115
Connection      keep-alive
Origin  http://www.mydomain.org
Access-Control-Request-Method   POST
Access-Control-Request-Headers  x-prototype-version,x-requested-with

when I put in URL just path to the script it is working, when I put
there full domain, it is not working.

Working example:
var a_c = new Ajax.Autocompleter('search_text','ac','/libs/
suggest.php',...)

Not Working example:
var a_c = new Ajax.Autocompleter('search_text','ac','http://
suggest.mydomain.org/libs/suggest.php',...)

I am using latest version of Prototype and Scriptaculous.

Any help, or workaround ?

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