function toggleSub(chi){
  dur = 0.5;
  $($($(chi).parentNode).parentNode).childElements().each(function(e){
      if(e.style.display == '' && e.className == 'submn') Effect.BlindUp(e, { duration: dur });
  });
  element = $($(chi).parentNode).next('li', 0);
  if($(element).style.display == 'none'){
    Effect.BlindDown(element, { duration: dur });
  }else{
    Effect.BlindUp(element, { duration: dur });
  }
}