YAHOO.util.Event.onContentReady("antmenupoziome", function () {

                var oMenuBar = new YAHOO.widget.MenuBar("antmenupoziome", { 
                                                            autosubmenudisplay: true, 
                                                            lazyload: true });

                oMenuBar.render();
//var itm = oMenuBar.getItem(0);

//var itms = itm.srcElement.getElementsByTagName("a");
//alert(itms[0].className);
//itm.srcElement.className="bordermenuprawy ";
//alert(itms[0].className);

            });