system = (navigator.appVersion.indexOf ("Mac") == -1) ? "PC" : "MAC";
browser = (navigator.appName.indexOf ("Microsoft") == -1) ? "NS" : "IE";
if (browser == "NS" && navigator.appVersion.substring (0,1) == 5) { browser = "IE"; }
BrowserOnSystem = browser + "on" + system;

switch (BrowserOnSystem)
{
	case "IEonPC":
		document.write("<link rel=stylesheet type='text/css' href='ie_pc.css'>");
		break;
	case "NSonPC":
		document.write("<link rel=stylesheet type='text/css' href='ie_pc.css'>");
		break;
	case "IEonMAC":
		document.write("<link rel=stylesheet type='text/css' href='ie_pc.css'>");
		break;
	case "NSonMAC":
		document.write("<link rel=stylesheet type='text/css' href='ie_mac.css'>");
		break;
	default:
		document.write("<link rel=stylesheet type='text/css' href='ie_pc.css'>");
		break;
}