int delaytime = 2000;
int switchpin = 8;
int ledpin = 13;
boolean statechanged(false);
boolean lastbutton(LOW);


 void setup()
{
 pinMode(ledpin, OUTPUT);
 pinMode(switchpin, INPUT);
}

void loop()
{

  if (digitalRead(switchpin) == HIGH && lastbutton == LOW)
  {
    statechanged = true;
    lastbutton = HIGH;
  }
  else
  {
    lastbutton = digitalRead(switchpin);
  }


  digitalWrite(ledpin, HIGH);
  delay(delaytime);
  digitalWrite(ledpin, LOW);
  delay(delaytime);

  if  ( statechanged == true && delaytime > 10)
 {
   delaytime = delaytime - 499;
 }
 else
 {
   delaytime = 2000;
 }
}