function show(menu_item)
{
  document.getElementById("podmenu" + menu_item).style.visibility = "visible";
  document.getElementById("a-menu"+menu_item).className = "selected";
}

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

function ukaz_kartonaz(div,pocet)
{
  for (i = 1; i <= pocet; i++) {
    parametr = div + "0" + i;
    document.getElementById(parametr).style.display = "none";
  }
  parametr = div + document.getElementById(div).value;
  document.getElementById(parametr).style.display = "block";
}

function zmen_obrazek()
{
  parametr = document.getElementById('oznaceni').value;
  parametr = parametr.substring(1,parametr.length);
  document.getElementById('tvar-obrazek').src = "../img/kartonaz/krb" + parametr + ".gif";
  document.getElementById('tvar-obrazek').alt = document.getElementById('oznaceni').value;
}