ajaxSetup or whatever

i have a problem and i couldnt solve it whole day,
$.ajaxSetup({
                   type: "POST",
                   url: "/----.aspx/Results",
                   contentType: "application/json; charset=utf-8",
                   dataType: "json",
                   success: function(msg) {
                   $('.searchresult').html(msg.d);
    & ...