//factory function that makes the togglers
function toggler(matchRe, replacement){
   var f = function(li, stop){
      if( li.className.match(matchRe)) {
		   li.className = li.className.replace(matchRe, replacement);
		   if(!stop){
		      mapKids(li, f);
		   }
		   return true;
	   }
	return false;
   }
   return f;
}

//the togglers we like
var openMenu = toggler(/collapsed/, "expanded");
var closeMenu = toggler(/expanded/, "collapsed");

//apply func to all kids of li with a className
function mapKids(li, func){
   if(li.childNodes){
      var child;
	   for(var i =0; i < li.childNodes.length; i++) {
		   child = li.childNodes[i];
		   if(child.className) {
		      //tell the function to stop processing after this one.
		      func(child, true);
		   }
	   }
	}
}


//IE doesn't support item.hasAttribute(attr), so here we are.
function hasAttribute(item, attr){
   return item.getAttribute(attr) != null;
}

//Loops through the <LI>s and adds the menu events if they have a $menuAttribute attribute.
function findAllLies() {

   //which li attribute should identify a dynamic menu.
   var menuAttribute= 'dynamicMenu'
   //which li attribute should identify if its open by default.
   var openAttribute= 'openByDefault'
   


   //event handling function, guts are in toggleMenu.
	function toggleVisible(e) {
		if (!e) e = window.event;
		var li = e.target || e.srcElement;
		//toggle it if we have a className
		li.className && ( openMenu(li) || closeMenu(li) );
		e.cancelBubble = true;
		if (e.stopPropagation) e.stopPropagation();
	}

	var elements = document.getElementsByTagName('li');
	for(var i =0; i < elements.length; i++) {
	   var li = elements[i];
      //only attach the event if we are part of the menu	   
	   if (hasAttribute(li, menuAttribute)){
	      if(li.addEventListener) li.addEventListener('click', toggleVisible, false);
		   else if(li.attachEvent) li.attachEvent('onclick', toggleVisible);
		   
		   if (hasAttribute(li, openAttribute)){
		      while(li.parentNode){
		         if(hasAttribute(li, menuAttribute)) openMenu(li);
		         li = li.parentNode;
		      }
		   }
		}
	}
}