function zapisz() {

            advAJAX.assign(document.getElementById("komentarz"), {
              onSuccess : function(obj) {
                     document.getElementById("tabelka_comment").innerHTML = obj.responseText;
              }
            });
        }

function post() {

            advAJAX.assign(document.getElementById("post"), {
              onSuccess : function(obj) {
                     document.getElementById("post_form").innerHTML = obj.responseText;
              }
            });
        }