var w = 5;
var x = w;
var y = 1;
var now;
  
function startClock() {
     x = x-y;
     if (x <= 1) reload();
     timerID = setTimeout("startClock()", 60000);
}
  
function reload() {
     now = new Date();
     var camImg = "http://www.acsoft82.co.uk/images/webcam/ispy1.jpg" + "?" + now.getTime();
     document.campicture.src = camImg;
     x = w;
}