let mybutton = document.getElementById("myBtn");

window.onscroll = function() {scrollFunction()};

function scrollFunction() {
    if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
        mybutton.style.display = "block";
    } else {
        mybutton.style.display = "none";
    }
}

function topFunction() {
    document.body.scrollTop = 0;
    document.documentElement.scrollTop = 0;
}

function toggleForm() {
    var form = document.getElementById("myForm");
    var button = document.getElementById("myButton");
    if (form.style.display === "none") {
        form.style.display = "block";
        button.style.display = "none";
    } else {
        form.style.display = "none";
        button.style.display = "block";
    }
}