browser = navigator.appName;
	appVer = parseInt(navigator.appVersion);
	ie = "Microsoft Internet Explorer";
	ns = "Netscape";
	if (navigator.appVersion.indexOf("Macintosh") != -1) {
		isMac = true;
	} else {
		isMac = false;
	}
	if (browser == ns && isMac == false) {
		if (appVer > 3) {
			document.write('<link rel="stylesheet" type="text/css" href="css/nn.css">');
		}
	} 	else if (browser == ie && isMac == true) {
	   document.write('<link rel="stylesheet" type="text/css" href="css/mac_ie.css">');
	} else if (browser == ns && isMac == true) {
	   document.write('<link rel="stylesheet" type="text/css" href="css/mac_nn.css">');
	} else {
		document.write('<link rel="stylesheet" type="text/css" href="css/ie.css">');
	}