var Mac = navigator.appVersion.indexOf('Mac',0) != -1; // Mac
var Saf  = navigator.userAgent.indexOf("Safari") != -1; //Safari
var Moz  = navigator.userAgent.indexOf("Gecko") != -1; //Mozilla
var Opr  = navigator.userAgent.indexOf("Opera") != -1; //Opera

var ver = (navigator.appVersion.charAt(0))
	if (Mac & Opr){
		document.write('<link rel="stylesheet" href="../common/css/fontset_opr.css" type="text/css">'); //for Opera
	}
	else if (Saf){
		document.write('<link rel="stylesheet" href="../common/css/fontset_mac.css" type="text/css">'); //for Mac Safari
	}
	else if (Mac & Moz){
		document.write('<link rel="stylesheet" href="../common/css/fontset_mac_moz.css" type="text/css">'); //for Mac Mozilla
	}
	else {
		document.write('<link rel="stylesheet" href="../common/css/fontset_win.css" type="text/css">'); //for other
	}