function showMenu(d){
  var id = d.id.substring(5);
  divs = document.getElementsByTagName('DIV');
  for(i=0;divs.length>i;i++){
    if(divs[i].id.indexOf('menu')==0&&divs[i].id!='menu'+id){
      divs[i].style.display='none';
      document.getElementById('o'+divs[i].id+'pic').src = "/media/folder_plus.jpg";
    }
  }
  st = document.getElementById('menu'+id).style;
  st.display = (st.display!='block')?'block':'none';
  document.getElementById(d.id+'pic').src = (st.display=='block')?"/media/folder_minus.jpg":"/media/folder_plus.jpg";
}