// set Variable
	var Agent = navigator.userAgent;
	var cssDir = '/css/';
	var cssTags = '<link rel="stylesheet" type="text/css" href="';
	var flag = null;

// CSS deverge for Cross Platform & Cross Browser
if (Agent.indexOf('Mac') != -1) {
		flag = "import_mac";
		document.open();
		document.write(cssTags + cssDir + flag + '.css" media="all" />');
		document.close();
}

// for debug
/*
alert(flag);
*/