void blinkLED(int pin, int onTime) {
  pinMode(pin, OUTPUT);
  digitalWrite(pin, HIGH);
  delay(onTime);       // uses whatever value was passed in
  digitalWrite(pin, LOW);
  delay(onTime);
}

void setup() {
  //pinMode(8, OUTPUT);
}

void loop() {
  blinkLED(13, 200);    // fast blink — 200 ms on/off
  blinkLED(13, 1000);   // slow blink — 1000 ms on/off
  blinkLED(8, 200);     // fast blink — 200 ms on/off
  blinkLED(8, 1000);    // slow blink — 1000 ms on/off
  blinkLED(5, 200);     // fast blink — 200 ms on/off
  blinkLED(5, 1000);    // slow blink — 1000 ms on/off
}