$(function() {
	$("#buttonContainer").disableSelection();
	initBanner();
});

var lastPhotoID = 1;
var maxPhotos = 1;
var timer = null;

function nextPhoto() {
	if (lastPhotoID == maxPhotos) {
		showPhoto(1);
	}
	else {
		showPhoto(lastPhotoID + 1);
	}
}

function previousPhoto() {
	if (lastPhotoID == 1) {
		showPhoto(maxPhotos);
	}
	else {
		showPhoto(lastPhotoID - 1);
	}
}

function pause() {
	clearInterval(timer);
}

function play() {
	setInterval(nextPhoto, 4000);
}

function showPhoto(id, isClick) {
	if (isClick) {
		pause();
	}
	
	if (id != lastPhotoID) {
		$("#photoIMG" + lastPhotoID).fadeOut(500);
		$("#photoIMG" + id).fadeIn(500);
		lastPhotoID = id;
		setActiveButton(lastPhotoID);
	}
}

function setActiveButton(id) {
	$("#buttonContainer a").removeClass("selected");
	$("#btBanner" + id).addClass("selected");
}

function initBanner() {
	$("div[id^=photoIMG]").hide();
	$("#photoIMG1").show();
	
	if ($("div[id^=photoIMG]").length > 1) {
		maxPhotos = $("div[id^=photoIMG]").length;
		timer = setInterval(nextPhoto, 2000);
	}
}