function switchView(parent_id) {
  Effect.Combo(parent_id,{duration: .2});

  id = parent_id + "-content";
  id_plusminus = "plusminus-" + parent_id;
  element = $(id);
  if(element.style.display == 'none') { 
//       element.style.display = 'block'; 
       $(id_plusminus).innerHTML = '--';
  }else { 
//       element.style.display = 'none'; 
       $(id_plusminus).innerHTML = '+';
  }

}

Effect.OpenUp = function(element) {
  element = $(element);
  new Effect.BlindDown(element, arguments[1] || {});
}

Effect.CloseDown = function(element) {
  element = $(element);
  new Effect.BlindUp(element, arguments[1] || {});
}

Effect.Combo = function(element) {
  id = element + "-content";
  id_plusminus = "plusminus-" + element;
  element = $(id);
  if(element.style.display == 'none') { 
       new Effect.OpenUp(element, arguments[1] || {}); 
       $(id_plusminus).innerHTML = '--';
  }else { 
       new Effect.CloseDown(element, arguments[1] || {}); 
       $(id_plusminus).innerHTML = '+';
  }
}

function showSubMenu(id) {
  $(id).toggle();
}