Pure CSS nested menu system.

 
// let's build the menu object
$this->build("p4a_menu", "menu");
 
// create whole structure
$this->menu->addItem("first", "First Element");
$this->menu->items->first->addItem("sub1", "Sub 1");
$this->menu->items->first->items->sub1->addItem("another1", "Another level");
$this->menu->items->first->addItem("sub2", "Sub 2");
		
$this->menu->addItem("second", "Second Element");
 
//intercept some clicks to do something (probably open masks)
$this->intercept($this->menu->items->first->items->sub2, "onClick", "sub2Click");