var agent = navigator.userAgent;
	var appver = navigator.appVersion;
	var nav = navigator.appName;
	var nver=null;os=null;

	if(agent.indexOf('Mac') != -1){
		os = "Mac";
	}else if(agent.indexOf('Win') != -1){
		os = "Win";
	}else{
		os = "unknown";
	}
	if(agent.indexOf('MSIE') == -1){
		nver = appver.charAt(0);
		if(nav == "Netscape"){
			nav = "NN";
		}
	}else{
		nver = agent.charAt(agent.indexOf('MSIE') + 5);
		nav = "IE";
	}

	if(os == "Mac"){
		document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="mac.css">');
	}else {
		document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="win.css">');
	}