ajax.request post physique send

i'm perplexing emanate post request, unfortunately physique post never seems sent.

below formula i'm using. formula invoked user clicks link, form "submit" button. runs but error, invokes servlet being called but, i mentioned earlier, physique post never seems sent.

i countenance ask physique never sent given i have opening servlet being called.

i've attempted controlling "parameters" reinstate "requestbody." i've also attempted controlling parameter twine (x=a?y=b). i've also approved "ckulk" does enclose current value.

any ideas?

new ajax.request(surl,
{
    method: 'post'
    , contenttype: "text/x-json"
    , requestbody: {ulk:ckulk}
    , onfailure:
        function(transport)
        {
            vjsonresp = transport.responsetext;
            var json = eval( "(" + vjsonresp + ")" );
            updatestatus(json.code + ": " + json.message);
        } // finish onfailure
    , onsuccess: 
        function(transport) 
        {
            (200 == transport.status)
            {
                vjsonresp = transport.responsetext;
            }
            else
            {
                log.value += "\n" + transport.status;
            }
         } // finish onsuccess
}); // finish ajax.request