function showtime()
{
 var now = new Date();
 var hours = now.getHours();
 var minutes = now.getMinutes();
 var seconds = now.getSeconds();
 var timeValue = "" + ((hours < 10) ? "0"+hours : hours);
 timeValue  += ((minutes < 10) ? ":0" : ":") + minutes;
 timeValue  += ((seconds < 10) ? ":0" : ":") + seconds;
 document.getElementById("zegarek").innerHTML = timeValue;
 timerID = setTimeout("showtime()",999);
}