var n4 = (document.layers)? true:false;

//======== for Macintosh
if(navigator.userAgent.indexOf('Mac') != -1) {
	if(n4){
		document.write('<link rel="stylesheet" type="text/css" href="/en/css/macnn.css">');
	} else {
		document.write('<link rel="stylesheet" type="text/css" href="/en/css/win.css">');
	}
}

//======== for Windows
else {
	if(n4){
		document.write('<link rel="stylesheet" type="text/css" href="/en/css/winnn.css">');
	} else {
		document.write('<link rel="stylesheet" type="text/css" href="/en/css/win.css">');
	}
}