function ukaz(id) {
   var d = document.getElementById(id);
   for (var i = 1; i<=20; i++) {
		if (document.getElementById('up_menu_'+i)) {document.getElementById('up_menu_'+i).style.display='none';}
   }
   if (d) {d.style.display='block'};
}

function skryj() {
   for (var i = 1; i<=20; i++) {
		if (document.getElementById('up_menu_'+i)) {document.getElementById('up_menu_'+i).style.display='none';}
   }
}

var last_open_menu_a = 0;

function rozbal_menu_a(cislopole){        
    if(last_open_menu_a > 0){
       document.getElementById("submenu_" + last_open_menu_a).style.display='none';
       }

    if(!document.getElementById("submenu_" + cislopole)){
       return;
       }
    
    document.getElementById("submenu_" + cislopole).style.display='block';
    last_open_menu_a = cislopole;       
    }