function toggleLayer(layer) {

}

function hideLayer(layer) {
	if (document.getElementById) {
		document.getElementById(layer).style.display = "none";
	}
	else if (document.all) {
		document.all[layer].style.display = "none";
	}
	else if (document.layers) {
		document.layers[layer].display = "none";
	}
}

function showLayer(layer) {
	if (document.getElementById) {
		document.getElementById(layer).style.display = "block";
	}
	else if (document.all) {
		document.all[layer].style.display = "block";
	}
	else if (document.layers) {
		document.layers[layer].display = "block";
	}
}

function tabOn( layer, image ) {
	if (document.getElementById) {
		document.getElementById(layer).src = "/_img/topnav/" + image;
	}
	else if (document.all) {
		document.all[layer].src = "/_img/topnav/" + image;
	}
	else if (document.layers) {
		document.layers[layer].src = "/_img/topnav/" + image;
	}
}