var timerID = null;
var timerRunning = false;
var I = 0;

function stopClock(){
        if(timerRunning)
        {
			clearTimeout(timerID)
			timerRunning = false
        }
}

function startClock(){
        stopClock();
        showClock();
}

function showClock() {
        timerID = setTimeout("showClock()", 6000);

        timerRunning = true;
        I++;
		if (I>images){I=1;}
		if (I<1){I=images;}
	   if (I < 10)
	   {
		x = '../images/' + imgprefix + '00' + I + '.jpg';
	   }
	   else
	   {
	    x = '../images/' + imgprefix + '0' + I + '.jpg';	
	   }
       document.images [0].src = x;
}