function expMenu(id) {
  var itm = null;
  if (document.getElementById) {
    itm = document.getElementById(id);
  } else if (document.all){
    itm = document.all[id];
  } else if (document.layers){
    itm = document.layers[id];                                                      
  }
  if (!itm) {
    // do nothing
  }
  else if (itm.style) {
    if (itm.style.display == "none") { itm.style.display = ""; }
    else { itm.style.display = "none"; }
  }
  else { itm.visibility = "show"; }
}
function ShowHide(id) {
  if (id != "") expMenu(id);
}