var timeID=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;
		
var face = document.getElementById('face');
face.innerHTML = "<span class='hora'>Hora Certa<br><span class='hora1'>" + timeValue + "</span></span>";
timerID = setTimeout("showtime()",1000);
timerRunning = true;
}