changing baud rate of the GPS

I saw your comment in Sparkfun.com on GPS (http://www.sparkfun.com/products/8975#), and you said to change the baudrate of the GPS i have to send in the command "$PMTK251,38400*27".


May I know what is the program that i have to run first, on the Arduino in order to allow me to send this command succesfully?
I tried sending it while running the following, but it ignored it:

void setup(){
  Serial.begin(57600);
}

void loop(){
  if(Serial.available()){
    Serial.print(Serial.read(), BYTE);
  }
}

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