var os = navigator.platform;
var brName = navigator.appName.charAt(0);
var brVer = navigator.appVersion.charAt(0);
var brType ="";

if(os == "Win32"){
	if((brName == "N") && (brVer >= 4)){
		brType = "css/win_nc";
			} else if((brName == "M") && (brVer >= 4)) {
		brType = "css/win_ie";
	}
} else if(os == "MacPPC"){
	if((brName == "N") && (brVer >= 4)){
		brType = "css/mac_nc";
			} else if((brName == "M") && (brVer >= 4)) {
		brType = "css/mac_ie";
	}
}

if(brType != ""){
	document.write('<' + 'LINK REL="StyleSheet" TYPE="text/css" HREF="' + brType + '.css"' + '>');
}