function loadMenu()
{
 var Name = "mymenu";
 var Index = 1;
 do
 {
   Name = "mymenu" + Index;
   obj = document.getElementById(Name);
   if(obj)
   {
   	obj.style.display = 'none';
   }
   Index++;
 }
 while(obj);
}
function switchMenu(obj) {
  loadMenu();
  var el = document.getElementById(obj);
  if ( el.style.display != 'none' ) {
    el.style.display = 'none';
  }
  else {
    el.style.display = '';
  }
}