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 from http://www.quirksmode.org/blog/archives/2005/10/_and_the_winner_1.html */
   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]);
      }
   },
/*
Written by Jonathan Snook, http://www.snook.ca/jonathan
Add-ons by Robert Nyman, http://www.robertnyman.com
*/
   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('menu','hidden');});