function menu(objectID,nazovmenu) {
  var object=document.getElementById(objectID);
  if (object.style.display=='block') {
    object.style.display='none';
   } else {
    closeall(nazovmenu);
    object.style.display='block';
   }
  return;
 };

function closeall(nazov) {
  var i=1;
  while (document.getElementById(nazov+i)) {
   document.getElementById(nazov+i).style.display='none';
   i++;
  }
 };