var Interv = 900;
function startClock2() {
	Interv = Interv - 1;
	
	if (Interv < 0) {
		
		//window.location.href="index.php";
		//document.getElementById('img_webcam').src='../inc/resize_img_cls.php?img=http://www.pocatky.cz/new/pocnam.jpg&amp;s=150&amp;v=150';
		document.getElementById('img_webcam').src='../inc/resize_img_cls.php?img=../userfiles/image/pocnam.jpg&amp;s=150&amp;v=150';
		Interv = 900;
	}

	document.getElementById('cas1').value = Interv;
	timrID = setTimeout("startClock2()", 1000);
}