function menu(polozka,akce,idcko) {

if (akce==1) {
                polozka==1 ? document.getElementById('a1').style.visibility = "visible" : document.getElementById('a1').style.visibility = "hidden";
                polozka==2 ? document.getElementById('a2').style.visibility = "visible" : document.getElementById('a2').style.visibility = "hidden";
                polozka==3 ? document.getElementById('a3').style.visibility = "visible" : document.getElementById('a3').style.visibility = "hidden";
                polozka==4 ? document.getElementById('a4').style.visibility = "visible" : document.getElementById('a4').style.visibility = "hidden";
                polozka==5 ? document.getElementById('a5').style.visibility = "visible" : document.getElementById('a5').style.visibility = "hidden";
                polozka==6 ? document.getElementById('a6').style.visibility = "visible" : document.getElementById('a6').style.visibility = "hidden";
             }

if (akce==0) {setTimeout("document.getElementById('a"+polozka+"').style.visibility = 'hidden'", 2500);}

}

function PopUp(url, w, h, s) {

 window.open(url,'','width=' + w + ',height=' + h + ',toolbar=no,directories=no,menubar=no,' +
                    'location=no,scrollbars=' + s + ',resizeable=no,top=100,left=100');
}