int maxBrightness = 254;
int minBrightness = 1;
int LED1 = 9;
int LED2 = 10;
int i;
void setup()
{
  pinMode(LED1,OUTPUT);
   pinMode(LED2,OUTPUT);
}
void loop()
{for (i=minBrightness;i<=maxBrightness;i=i+1)
{
analogWrite(LED1,i);
analogWrite(LED2,255-i);
delay(10);}
delay(100);}