function pridejListener(kam, udalost, fce) {
    if(kam.addEventListener) {
        kam.addEventListener(udalost, fce, false);
    } else {
        kam.attachEvent("on" + udalost, fce);
    }
}

function odeberListener(kam, udalost, fce) {
  if (kam.detachEvent) { 
    kam.detachEvent('on' + udalost, fce);
  } else
    kam.removeEventListener(udalost, fce, false);
}  

var timerID = null;
var timerRunning = false;

function showtime() {
    today = new Date();
    BigDay = new Date("july 18, 2009 10:00:00");
    msPerDay = 24 * 60 * 60 * 1000 ;
    timeLeft = ((BigDay.getTime() - today.getTime()));
    e_daysLeft = timeLeft / msPerDay;
    daysLeft = Math.floor(e_daysLeft);
    e_hrsLeft = (e_daysLeft - daysLeft)*24;
    hrsLeft = Math.floor(e_hrsLeft);
    minsLeft = Math.floor((e_hrsLeft - hrsLeft) * 60);
    e_minsLeft = (e_hrsLeft - hrsLeft)*60;
    secLeft = Math.floor((e_minsLeft - minsLeft)*60);

    Temp3 = "Zbývá ";
    if(daysLeft > 4) Temp3+=daysLeft + ' dnů, ';
    else if(daysLeft > 1) Temp3+= daysLeft + ' dny, ';
    else if(daysLeft == 1) Temp3+= daysLeft + ' den, ';

    if(hrsLeft == 1) Temp3+=hrsLeft+' hodina, ';
    else Temp3+=hrsLeft+' hodin, ';

    if(minsLeft == 1) Temp3+=minsLeft+' minuta a ';
    else Temp3+=minsLeft+' minut a ';

    if(secLeft == 1) Temp3+=secLeft+' sekunda.';
    else Temp3+=secLeft+' sekund.';

    document.getElementById('remaining').innerHTML = Temp3;
    timerID = setTimeout("showtime()",1000);
    timerRunning = true;
}

function stopClock () {
    if(timerRunning) clearTimeout(timerID);
    timerRunning = false;
}

function startClock() {
    stopClock();
    showtime();
}

var existuje = Array(
    Array("fotogalerie.html", "fotogalerii"),
    Array("interpreti.html", "vystupující interprety"),
    Array("kontakty.html", "stránku s kontakty")
);

function printExists() {
    var a = Math.floor(Math.random() * existuje.length);

    var odstavec = document.getElementById("existing");
    odstavec.innerHTML = 'Můžete se podívat na <a href="' + existuje[a][0] + '" title="' + existuje[a][1] + '">' + existuje[a][1] + '.</a>';
}