Proxy.pac local domain

function FindProxyForURL(url, host) {
if (isPlainHostName(host) || dnsDomainIs(host, ".xinux.lan")) {
            return "DIRECT";
   }
if (isInNet(host, "10.0.0.0", "255.0.0.0.0")) {
    return "DIRECT";
}
if (isInNet(host, "192.168.0.0", "255.255.0.0")) {
    return "DIRECT";
}
if (isInNet(host, "172.16.0.0", "255.240.0.0")) {
    return "DIRECT";
}
   return "PROXY nagus.xinux.lan:3128";
}