 			currentView -= 2
 		}
 		timer.invalidate()
-		timerDidFire()
+		presentNextScreen()
 	}
 	
 	var isGameStarted = false

		backButton.setTitle("Back", forState: UIControlState.Normal)
	}
	
	override func presentNextScreen() {
		timerDidFire()
	}
	
	override func presentPreviousScreen() {
		if currentView == 0 {
			return

	override func skip() {
		currentView = 2
		timer.invalidate()
		presentNextScreen()
	}
    
    override func presentNextScreen() {
		
		timerLastStarted = NSDate()
		
