function clock() {
    var digital = new Date();
    var hours = digital.getHours();
    var minutes = digital.getMinutes();
    var seconds = digital.getSeconds();
    if (minutes <= 9) minutes = "0" + minutes;
    if (seconds <= 9) seconds = "0" + seconds;
    dispTime = hours + ":" + minutes + ":" + seconds;
    document.getElementById('godzina').innerHTML = dispTime;
    setTimeout("clock()", 1000);
}