var toggleMenu = {
  init : function(sContainerClass, sHiddenClass) {
    if (!document.getElementById || !document.createTextNode) {return;} // Check for DOM support
    var arrMenus = this.getElementsByClassName(document, 'ul', sContainerClass);
    var arrSubMenus, oSubMenu, oLink;
    for (var i = 0; i < arrMenus.length; i++) {
      arrSubMenus = arrMenus[i].getElementsByTagName('ul');
      for (var j = 0; j < arrSubMenus.length; j++) {
        oSubMenu = arrSubMenus[j];
        oLink = oSubMenu.parentNode.getElementsByTagName('a')[0];
        oLink.onclick = function(){toggleMenu.toggle(this.parentNode.getElementsByTagName('ul')[0], sHiddenClass); return false;}
        this.toggle(oSubMenu, sHiddenClass);
      }
    }
  },

  toggle : function(el, sHiddenClass) {
    var oRegExp = new RegExp("(^|\\s)" + sHiddenClass + "(\\s|$)");
    el.className = (oRegExp.test(el.className)) ? el.className.replace(oRegExp, '') : el.className + ' ' + sHiddenClass; // Add or remove the class name that hides the element
  },

  addEvent : function(obj, type, fn) {
    if (obj.addEventListener)
      obj.addEventListener(type, fn, false);
    else if (obj.attachEvent) {
      obj["e"+type+fn] = fn;
      obj[type+fn] = function() {obj["e"+type+fn](window.event);}
      obj.attachEvent("on"+type, obj[type+fn]);
    }
  },

  getElementsByClassName : function(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && document.all)? document.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
      oElement = arrElements[i];
      if(oRegExp.test(oElement.className)){
        arrReturnElements.push(oElement);
      }
    }
    return (arrReturnElements)
  }
};

toggleMenu.addEvent(window, 'load', function(){toggleMenu.init('menut','hidden');});