function hover_navigace(objekt, action) {
 var active = "false";
 if(action == "over") {
  objekt.style.color = 'yellow';
 }
 if(action == "out") {
  objekt.style.color = 'white';
 }
}

function slepy_odkaz(rubrika) { 
 var podnabidka = document.getElementById("submenu-"+rubrika);
 if (podnabidka.style.display == "none") {
  podnabidka.style.display = 'block';
 } else {
  podnabidka.style.display = 'none';
 }
}