isMac = (navigator.appVersion.indexOf("Mac") != -1);
isIE = (navigator.appName == "Microsoft Internet Explorer")
isNN = (navigator.appName == "Netscape")

if (isNN) {
	document.write('<link rel="stylesheet" type="text/css" href="includes/nn.css">');
}
if (isMac && isIE) {
	document.write('<link rel="stylesheet" type="text/css" href="includes/macie.css">');
}