function refreshIt() {
   if (!document.images) return;
   document.images['myCam'].src = 'images/webcam32o.jpg?' + Math.random();
   setTimeout('refreshIt()',4000);
}

function ImageLoadFailed() {
   if (!document.images) return;
   document.images['myCam'].src = 'images/webcam32oe.jpg?' + Math.random();
}