if (navigator.userAgent.indexOf("Win") >= 0) {
		if (vercheck(1,0)) {
				document.write('<link rel="stylesheet" type="text/css" href="css/win_ie.css">');
		} else {
				document.write('<link rel="stylesheet" href="css/win_nn.css" type="text/css">');
		}
} else {
		document.write('<link rel="stylesheet" type="text/css" href="css/mac.css">');
}

function vercheck(IEversion,NNversion) {
	if ((navigator.appName.indexOf("Microsoft") >= 0)
		&&(IEversion != 0)
		&&(IEversion <= parseFloat(navigator.appVersion))) {
		return true;
	} else {
		if ((navigator.appName.indexOf("Netscape") >= 0)
			&&(NNversion != 0)
			&&(NNversion <= parseFloat(navigator.appVersion))) {
			return true;
		} else {
			return false;
		}
	}
}