function FindProxyForURL(url, host)
{
if (shExpMatch(host, "(192.168.16.*|192.168.17.*|172.16.0.*)"))
        return "DIRECT";

if (isInNet(myIpAddress(), "192.168.16.0", "255.255.254.0"))
return "PROXY 192.168.16.20:3128";
else
return "DIRECT";
}