var t = 12; // interval in seconds
			function Start() {
				tmp = new Date();
				tmp = "?"+tmp.getTime();
				for(c=0; c<=4; c++){
					if (c == 0) {
						document.images['webcam'+c].src = "/img/webcam.jpg"+tmp;
					} else {
						document.images['webcam'+c].src = "/img/webcam0"+c+".jpg"+tmp;
					}
				}
				setTimeout("Start()", t*1000);
			}