var pfote    = 9;
	var maxPfote = 9;
	var schritt  = 1;
	var pfoteAlt = -1;
	var img_b = "/images/wolf_50x50_b.jpg";
	var img_s = "/images/wolf_50x50.jpg";

	function footprint() {
		
		pfote = pfote + schritt;
		if( pfote > maxPfote ) {
			schritt = -1;
			pfote   = maxPfote;
			pfoteAlt = -1;
			imgname = "img_" + pfote;
			document.images[imgname].src = img_b;
			
		} else {
			if( pfote < 1 ) {
				schritt = -1;
				pfote   = maxPfote;
				pfoteAlt = 1;
				imgname = "img_" + pfote;
				document.images[imgname].src = img_b;
				
			} else {
				imgname = "img_" + pfote;
				document.images[imgname].src = img_b;
				
			}
		}
		
		window.setTimeout('footprint2();', 300);
	}

	function footprint2() {
		if( pfoteAlt != -1 ) {
			imgname = "img_" + pfoteAlt;
			document.images[imgname].src = img_s;
		}
		pfoteAlt = pfote;
		window.setTimeout('footprint();', 1500);	
	}