function openTab(evt, tabName, id) {
    var parent = document.getElementById(id);
    var tabcontent = parent.getElementsByClassName("db-tab");
    for (i = 0; i < tabcontent.length; i++) {
        tabcontent[i].style.display = "none";
    }

    tablinks = parent.getElementsByClassName("db-tablink");
    for (i = 0; i < tablinks.length; i++) {
        tablinks[i].className = tablinks[i].className.replace(" active", "");
    }


    document.getElementById(tabName).style.display = "block";
    evt.currentTarget.className += " active";
}

var slideIndex = 0;
var timer = 10;
showNextSlide();

// Next/previous controls
function plusSlides(n) {
    showSlides(slideIndex += n);
    timer = 0;
}

// Thumbnail image controls
function currentSlide(n) {
    showSlides(slideIndex = n);
    timer = 0;
}

function showNextSlide() {
    var slides = document.getElementsByClassName("mySlides");
    if (slides.length > 0) {
        if (timer >= 10) {
            slideIndex++;
            showSlides(slideIndex);
            timer = 0;
        }
    }
    timer++;
    setTimeout(showNextSlide, 1000);
}

function showSlides(n) {
    var i;
    var slides = document.getElementsByClassName("mySlides");
    var dots = document.getElementsByClassName("dot");
    if (n > slides.length) { slideIndex = 1 }
    if (n < 1) { slideIndex = slides.length }
    for (i = 0; i < slides.length; i++) {
        slides[i].style.display = "none";
    }
    for (i = 0; i < dots.length; i++) {
        dots[i].className = dots[i].className.replace(" active", "");
    }
    if (slides.length > 0) {
        slides[slideIndex - 1].style.display = "block";
        dots[slideIndex - 1].className += " active";
    }
}