if (document.layers){
	mac = (navigator.appVersion.indexOf('Mac') != -1)?true:false;
	if (mac){	//Mac NN4.7の場合
		document.write('<link rel="stylesheet" href="global_macNN.css" type="text/css">');
	} else {	//Win NN4.7の場合
		document.write('<link rel="stylesheet" href="global_NN.css" type="text/css">');
	}
} else {		//上記以外の場合
	document.write('<link rel="stylesheet" href="global.css" type="text/css">');
}