function setVisible(layerName) {
	if (document.layers) {
		if (document.layers[name]) {
			document.layers[layerName].visibility = "show";
		}
	}
	else {
		if (document.getElementById) {
			if (document.getElementById(layerName)) {
				document.getElementById(layerName).style.visibility = "visible";
			}
		}
		else {
			if (document.all[layerName]) {
				document.all[layerName].style.visibility = "visible";
			}
		}
	}
}

function clearVisible(layerName) {
	if (document.layers) {
		if (document.layers[name]) {
			document.layers[layerName].visibility = "hide";
		}
	}
	else {
		if (document.getElementById) {
			if (document.getElementById(layerName)) {
				document.getElementById(layerName).style.visibility = "hidden";
			}
		}
		else {
			if (document.all[layerName]) {
				document.all[layerName].style.visibility = "hidden";
			}
		}
	}
}