function block (nr) {
	if (document.layers) {
		var current = (document.layers[nr].display == 'none') ? 'block' : 'none';
		document.layers[nr].display = current;

	} else if (document.all) {
		var current = (document.all[nr].style.display == 'none') ? 'block' : 'none';
		document.all[nr].style.display = current;

	} else if (document.getElementById) {
		var current = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		document.getElementById(nr).style.display = current;
	}
	
	document.cookie = "" + nr + "=" + current;
}

function rating_over (nr) {
	if (document.getElementById) {
		document.getElementById("rating" + nr).src = "/images/rating-" + nr + ".gif";
	} else if (document.all)  {
		document.all("rating" + nr).src = "/images/rating-" + nr + ".gif";
	}
}

function rating_down (nr) {
	if (document.getElementById) {
		document.getElementById("rating" + nr).src = "/images/rating-" + nr + "-on.gif";
	} else if (document.all)  {
		document.all("rating" + nr).src = "/images/rating-" + nr + "-on.gif";
	}
}

function rating_out (nr) {
	if (document.getElementById) {
		document.getElementById("rating" + nr).src = "/images/rating-" + nr + "-off.gif";
	} else if (document.all)  {
		document.all("rating" + nr).src = "/images/rating-" + nr + "-off.gif";
	}
}