function platform() {
     var version = navigator.appVersion;
     
     if (version.indexOf('PPC') > -1) {
     	if (version.indexOf('MSIE 5.0') > -1) {
     		return 'Win';
     	}
     	else {
     		return 'Mac';
     	}
     }

     if (version.indexOf('Win') > -1) {
         return 'Win';
     }
     else
         return 'Win';
 }
 
var browser = platform();

if (browser == "Mac") {
	document.writeln('<link rel="stylesheet" href="nmstyle-mac.css">');
}
else {
	document.writeln('<link rel="stylesheet" href="nmstyle-pc.css">');
}