backtop.js


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// When the user scrolls down 20px from the top of the document, show the button
window.onscroll = function() {scrollFunction()};
scrollFunction();

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

// When the user clicks on the button, scroll to the top of the document
function topFunction() {
    document.body.scrollTop = 0; // For Safari
    document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
}