function ukaz_podmenu(menu_item)
{
  if (document.getElementById("podmenu-" + menu_item).style.display == "")
    document.getElementById("podmenu-" + menu_item).style.display = "none";

  if (document.getElementById("podmenu-" + menu_item).style.display == "none") {
    document.getElementById("podmenu-" + menu_item).style.display = "block";
    document.getElementById("menu-"+menu_item).className = "selected";
  }
  else {
    document.getElementById("podmenu-" + menu_item).style.display = "none";
    document.getElementById("menu-"+menu_item).className = "";  
  }

 
}

function smaz_podmenu(menu_item)
{
  document.getElementById("menu"+menu_item).className="";
  document.getElementById("podmenu" + menu_item).style.visibility = "hidden";
}