function toggle_menu(menu_name) {
   
   var this_menu = document.getElementById(menu_name);

   
   if (this_menu.className.indexOf('closed') > -1) { 
      this_menu.className = "" ;
   } else {
      this_menu.className = "closed" ;
   }
      

   if ((menu_name == "searchbar") && (this_menu.className == "")) {
      document.getElementById("searchbox").focus() ;
   }
   
}