// Check browser version
var isNav4, isIE4;
var tree = self.name;
var frm = self;

if (parseInt(navigator.appVersion.charAt(0))>=4) {
	isNav4 = (navigator.appName.indexOf("Netscape")!=-1) ? true : false;
	isIE4 = (navigator.appName.indexOf("Microsoft")!=-1) ? true : false;
}

// Returns a handle to the named layer.
function getLayer (name) {
	if (isNav4) {
		return document.layers[name];
	} else if (isIE4) {
		layer = eval ('document.all.' + name + '.style');
		return layer;
	} else 
		return null;
}

// Hides layer if visible
function hideLayer (name) {
	var layer = getLayer (name);
	
	if (isNav4) layer.visibility = "hide";
	if (isIE4) layer.visibility = "hidden";
}

// Shows layer if hidden
function showLayer (name) {
	var layer = getLayer (name);
	
	if (isNav4) layer.visibility = "show";
	if (isIE4) layer.visibility = "visible";
}

// Checks if layer is vissible
function isVisible (name) {
	var layer = getLayer (name);
	
	if (isNav4 && layer.visibility=="show") return true;
	if (isIE4 && layer.visibility=="visible") return true;
	
	return false;
}

function fillContent (name) {
	var layer = getLayer (name);
	
		if (isNav4) {
		layer.document.open();
		layer.document.write(code);
		layer.document.close();
	}
	if (isIE4) {
		layer = eval ('document.all.'+name);
		layer.innerHTML = code;
	}
}