var allSlides;
var currSlide = 0
var ids;
var time = 5000;
var play = true;

function startSlideShow () {
	allSlides[0].style.display = "block";
	playPause();
}
// Set global with array of slide elements
function getAllSlides() {
	var allChildren = document.getElementById("slides").childNodes;
    var slideElems = new Array();
    for (var i = 0; i < allChildren.length; i++) {
        if (allChildren[i].nodeType == 1) {
             slideElems[slideElems.length] = allChildren[i];
			
        }
    }
    allSlides = slideElems;
	startSlideShow();
}

// Advance to next slide
function next(auto) {
    if (currSlide < allSlides.length - 1) {
        allSlides[currSlide].style.display = "none";
        allSlides[++currSlide].style.display = "block";
    } else {
        allSlides[currSlide].style.display = "none";
		currSlide = 0;
        allSlides[currSlide].style.display = "block";
    }
	if (typeof auto == "undefined") {
		checkPlay();
	}
}

// Go to previous slide
function prev() {
    if (currSlide > 0) {
        allSlides[currSlide].style.display = "none";
        allSlides[--currSlide].style.display = "block";
    } 
	checkPlay();
}

function playPause() {
	var playPause_btn = document.getElementById("playPause");
	
	if (play) {
		ids = setInterval("next(true)", time)
		playPause_btn.innerHTML = "Pause"
	} else {
		clearInterval(ids);
		playPause_btn.innerHTML = "Play"
	}
	play = !play;
}

function checkPlay() {
		play = false;
		playPause();
}

// Initialize slide show
function initSlides() {
    getAllSlides();
    
}