#define BUTTON_PIN  12
#define LED_PIN1     11
#define LED_PIN2  13

boolean buttonWasUp = true;  
boolean ledEnabled = false;  
 
void setup()
{
  pinMode(LED_PIN1, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}
void loop()
{
  boolean buttonIsUp = digitalRead(BUTTON_PIN);
  if (buttonWasUp && !buttonIsUp) 
    delay(10);
    buttonIsUp = digitalRead(BUTTON_PIN);
    if (!buttonIsUp) 
      ledEnabled = !ledEnabled;
      digitalWrite(LED_PIN1, ledEnabled);
    }