int ch1 = 5;
int ch2 = 6;

void setup() {
  pinMode(ch1, OUTPUT);
  pinMode(ch2, OUTPUT);
}

void loop() {
  //call function 
  pflasher();
}

void testFunction(int ontime, int offtime) {
  digitalWrite(ch1, HIGH);
  delay(ontime);
  digitalWrite(ch1, LOW);
  delay(offtime);
}
void pflasher() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(ch1, HIGH);
    delay(25);
    digitalWrite(ch1, LOW);
    delay(125);
  }
  for (int i = 0; i < 3; i++) {
    digitalWrite(ch2, HIGH);
    delay(25);
    digitalWrite(ch2, LOW);
    delay(125);
  }
}