public IEnumerator FlipToPage(int targetPage, float animationTime){

	int startPage = currentPage;
	float elapsedTime = 0;
	
	while (elapsedTime < animationTime){
		
		currentPage = (int)Mathf.lerp(startPage,targetPage,elaspedTime/animationTime);
		
		yield return new waitForFrame();
		elapsedTime += Time.deltaTime;
	}
	
	currentPage = targetPage;
	
}


public IEnumerator PingPong(int startPage, int endPage, float animationTime,float PauseTime){
	
	
	int currentPage = currentPage;
	int targetPage = endPage;
	
	While(true){
		
		yield return startCoroutine(FlipToPage(targetPage,animationTime)
		yield return new WaitForSeconds(PauseTime)
		
		
		targetPage = (targetPage == endPage) ? startPage : endPage		
	}
	
	
	
	
}