var timerID = null;
var timerRunning = false;

function showtime() {
    today = new Date();
    BigDay = new Date("August 17, 2012 15:00:00")
    msPerDay = 24 * 60 * 60 * 1000 ;
    timeLeft = (BigDay.getTime() - today.getTime());
    e_daysLeft = timeLeft / msPerDay;
    daysLeft = Math.floor(e_daysLeft);
    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);
    hrsLeft = hrsLeft;
    e_minsLeft = (e_hrsLeft - hrsLeft)*60;
    secLeft = Math.floor(e_hrsLeft);
    secLeft = Math.floor((e_minsLeft - minsLeft)*60);
    secLeft = secLeft;

    if(minsLeft < 10) minsLeft = '0' + minsLeft.toString();
    if(secLeft < 10) secLeft = '0' + secLeft.toString();

    Temp3 = daysLeft+' dní '+hrsLeft+':'+minsLeft+':'+secLeft
    document.getElementById('odpocet').innerHTML = Temp3;
    timerID = setTimeout("showtime()",1000);
    timerRunning = true;
}

var timerID = null;
var timerRunning = false;

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

function stopClock() {
    stopclock();
    return;
}

function startclock () {
    stopclock();
    showtime();
}