function showSubMenu( cls, lvl  ){
                if (typeof lvl == "undefined") {
                    lvl = 2;
                }

                els = document.getElementsByTagName("li");

                for (var i = 0; i < els.length; i++){
                    if (els[i].className.indexOf(cls) != -1){
                    if (els[i].className.indexOf("level2") != -1){
                            els[i].style.display = 'block';
                        }

                        if (els[i].className.indexOf("level1") != -1){
                          els[i].style.fontWeight = 'bold';
                        }
                    }
                }
            }