byte led1 = 5;
byte led2 = 6;

void setup() {
  pinMode(led1, OUTPUT); 
  pinMode(led2, OUTPUT); 
}

void loop() {
 analogWrite(led1,255);
 analogWrite(led2,255);
 delay(1000);
  analogWrite(led1,152);
 analogWrite(led2,152);
 delay(1000);
  analogWrite(led1,50);
 analogWrite(led2,50);
 delay(1000);
  analogWrite(led1,5);
 analogWrite(led2,5);
 delay(1000);
 }