browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

if (browserName == "Netscape" && browserVer >= 3) 
	version = "n3";
else if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) 
	version = "n3";
else version = "n2";

if (version == "n3")         
{
	yellowon = new Image(30, 30);
	yellowon.src = "images/yellowon.gif";
	yellowoff = new Image(30, 30);
	yellowoff.src = "images/yellowoff.gif";
	
	blueon = new Image(30, 30);
	blueon.src = "images/blueon.gif";
	blueoff = new Image(30, 30);
	blueoff.src = "images/blueoff.gif";
	
	orangeon = new Image(30, 30);
	orangeon.src = "images/orangeon.gif";
	orangeoff = new Image(30, 30);
	orangeoff.src = "images/orangeoff.gif";

	lgreenon = new Image(30, 30);
	lgreenon.src = "images/lgreenon.gif";
	lgreenoff = new Image(30, 30);
	lgreenoff.src = "images/lgreenoff.gif";
	
	dgreenon = new Image(30, 30);
	dgreenon.src = "images/dgreenon.gif";
	dgreenoff = new Image(30, 30);
	dgreenoff.src = "images/dgreenoff.gif";

}

function img_act(imgName, imgNum) 
{
	if (version == "n3") 
	{
		imgOn = eval(imgName + "on.src");
		document.images[imgNum].src = imgOn;
	}
	return true;
}     

function img_inact(imgName, imgNum) 
{
	if (version == "n3") 
	{
		imgOff = eval(imgName + "off.src");
		document.images[imgNum].src = imgOff;
	}
	return true;
}