function FindProxyForURL(url, host) {

  if ((url.substring(0, 5) != "http:") &&
      (url.substring(0, 4) != "ftp:") &&
      (url.substring(0, 7) != "gopher:")) {
    return "DIRECT";
  }

  if (shExpMatch(host, "206.103.64.*") ||
     shExpMatch(host, "*mexcom.net") ||
     shExpMatch(host, "*emprende.net.mx") ||
     shExpMatch(host, "*wtcver.org.mx")) {
    return "DIRECT";
  }

  return "PROXY proxy.mexcom.net:3128 ;  DIRECT";
}