function hideAll(){
  var tbs = document.getElementById('menu-items').childNodes;
  for(i in tbs){
    if(tbs[i].tagName == 'TABLE') {
      tbs[i].className = 'menu-pos-hidden';
    }
  }

  var li = document.getElementsByTagName('li');
  for(i in li){
    if(li[i].className == 'selected') li[i].className = '';
  }
  return false;
}


function menuShow(id,element){
  hideAll();
  element.parentNode.className = 'selected';
  var tab = document.getElementById(id);
  tab.className = 'menu-pos';
  return false;
}