function form_to_qs(form) {
    var qs = "";
    var fields_array = $(form[0].elements);
    fields_array.each(
        function (e,i){
            var pair = e.name + "=" + encodeURIComponent(e.value);
            qs = qs + pair + ((i < fields_array.length - 1)?"&":"");
        }
    );
    return qs;
}