yeah as soon as I put something in it seem didnt work.
At least it appeared so, the forms are not getting passed as regular post or get calls, but instead being passed as OPTIONS. (cos of your header)
I get this in the BROWSER console in firefox (CTRL SHIFT J)
Request URL: lennaerthohe.nl/ajaxtest/index.php
Request Method: OPTIONS
Status Code: HTTP/1.1 200 OK
Request Headers 17:40:25.000
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0
Accept-Encoding: gzip, deflate
Response Headers ?124ms
Expires: Wed, 12 Feb 2014 16:40:42 GMT
Date: Wed, 12 Feb 2014 16:40:42 GMT
Seems like they are being set.