if (navigator.userAgent.indexOf("Win") >= 0) {
	if (navigator.appName.indexOf("Microsoft") >= 0) {
		version="win_ie";
	} else {
			if(navigator.appVersion.charAt(0) >= 0){
			version="win_nn";
		}
	}
} else {
	if (navigator.appName.indexOf("Microsoft") >= 0) {
		version="mac_ie";
	} else {
			if(navigator.appVersion.charAt(0) >= 0){
			version="mac_nn";
		}
	}
}

document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="/css/'+version+'.css">')