var FlowerAnimInterval = 500;
var FlowerIndex = 1;
var FlowerAnim = null;
var FlowerImage = null;

function FlowerAnim_ontimer() {
	clearInterval(FlowerAnim);
	FlowerIndex += 1;
	if (FlowerIndex > 3)
		FlowerIndex = 1;

	FlowerImage.src = 'img/Flower-' + FlowerIndex + '.png';
	FlowerAnim = setInterval(FlowerAnim_ontimer, FlowerAnimInterval);
}

// Start
FlowerImage = document.getElementById("index_img");
FlowerAnim = setInterval(FlowerAnim_ontimer, FlowerAnimInterval);