var i = 15;
	var j = 20;
	var aktiv;
	
	function Start () {
		aktiv = window.setInterval("ShowOne()", 300);
	}
	
	function ShowOne () {
		x = Math.ceil(Math.random() * i);
		y = Math.ceil(Math.random() * j);
		if (x < 10) {
			imgName = "0" + x;
		} else {
			imgName = "" + x;
		}
		if (y < 10) {
			imgName = imgName + "0" + y;
		} else {
			imgName = imgName + "" + y;
		}

		document.getElementById(imgName).src = "./images/river/" + imgName + ".jpg";
 		// document.images[imgName].src = "./images/port/" + imgName + ".jpg";
	}