acc-trigger.js

$(".acctrigger").click(function() {
    var target = $(this).attr('href');
    $('.acc-page').removeClass('active');
    $('.acctrigger').removeClass('active');

    $(target).addClass('active');
    var target = $(this).attr('href');

    $(this).addClass('active');
    return false;
});

var slideIndex = 0;
showSlides();

function showSlides() {
    var i;
    var slides = document.getElementsByClassName("acc-page");
    slideIndex++;
    if (slideIndex > slides.length) {
        slideIndex = 1
    }
    for (i = 0; i < slides.length; i++) {
        slides[i].className = slides[i].className.replace(" active", "");
    }
    slides[slideIndex - 1].className += " active";
    setTimeout(showSlides, 4000); // Change image every 2 seconds
}