rottCantLoop.js

var aniend = 'webkitAnimationEnd mozAnimationEnd MSAnimationEnd oanimationend animationend';

function layerClassChanger(slide){
    var i = 0;
    slide.children.forEach(function (e) {
        i++;
        e.className = "layer" + i.toString() + " slide-item animated phase" + i.toString();   
    });
}

//Rotten can't loop
function rottCantLoop(newSlide, oldSlide) {
    var ns = document.getElementById("slide" + newSlide);
    ns.className = "enabled";
    layerClassChanger(ns);
    var os = document.getElementBy("slide" + oldSlide);
    os.className = "disabled";
    layerClassChanger(os);
}

for (var i = 0; i < 4; i++) {
    var oldSlide = i+1;
    var newSlide = i+2;
    rottCantLoop(newSlide, oldSlide);
}