int led1=5;
int led2=6;

void setup() {
  // put your setup code here, to run once:
pinMode(led1,OUTPUT);
pinMode(led2, OUTPUT);
digitalWrite(led1,LOW);
digitalWrite(led2,LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
analogWrite(led1,10);
analogWrite(led2,204);
delay(1000);
analogWrite(led1,204);
analogWrite(led2,10);
delay(1000);
}