if (navigator.userAgent.indexOf("Win") >= 0) {
	if (navigator.appName.indexOf("Microsoft") >= 0) {
		version="win_ie";
	} else {
		if(navigator.appVersion.charAt(0) >= 5){
			version="win_nn6";
		}else {
			version="win_nn";
		}
	}
} else {
	version="mac";
}
document.write('<LINK rel="stylesheet" TYPE="text/css" HREF="css/'+version+'.css">');