var Mac = navigator.appVersion.indexOf('Mac',0) != -1; // Mac
var Win = navigator.appVersion.indexOf('Win',0) != -1; // Win
var IE  = navigator.appName.indexOf("Microsoft Internet Explorer",0) != -1; //IE
var NS  = navigator.appName.indexOf("Netscape",0) != -1; // Netscape
var MacNS6 = navigator.userAgent.indexOf("Netscape6/6.0") != -1; // MacNetscape 6.0
var MacIE4 = navigator.userAgent.indexOf("MSIE 4") != -1; // MacIE4.x
var Moz = navigator.userAgent.indexOf("Gecko") != -1; // Mozilla, Netscape 6.x, 7.x

var ver = (navigator.appVersion.charAt(0));

if (Mac){
	document.write('<link rel="stylesheet" href="/css/font_mac.css" type="text/css">'); //for MacNS6.0
}
else if (Win){
	document.write('<link rel="stylesheet" href="/css/font_win.css" type="text/css">'); //for MacNS6.2, NS7.0
}