var Interv = 120;
function startClock3() {
	Interv = Interv - 1;
	
	if (Interv < 0) {
		window.location.href="?pg=webcam"; 
		//document.getElementById('webcam_big').src='../inc/resize_img_cls.php?img=../userfiles/image/pocnam.jpg&s=640&v=480';
		Interv = 120;
	}

	document.getElementById('cas2').value = Interv;
	timrID = setTimeout("startClock3()", 1000);
}