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

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

function showtime()
{
    var now = new Date();
    var hours = now.getHours();
    var minutes = now.getMinutes();
    var seconds = now.getSeconds();
    var timeValue = "" + hours;
    timeValue  += ((minutes < 10) ? ":0" : ":") + minutes;
    timeValue  += ((seconds < 10) ? ":0" : ":") + seconds;
    document.clock.face.value = timeValue;
    timerID = setTimeout("showtime()",1000);
    timerRunning = true;
}

function otworz(nazwa)
{
window.open(nazwa,'prawa','scrollbars,height=450,width=350');
}