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var new_scroll_position = 0;
var last_scroll_position;
var header = document.getElementById("header");
window.addEventListener('scroll', function(e) {
last_scroll_position = window.scrollY;
// Scrolling down
if (new_scroll_position < last_scroll_position && last_scroll_position > 80) {
// header.removeClass('slideDown').addClass('slideUp');
header.classList.remove("slideDown");
header.classList.add("slideUp");
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// header.removeClass('slideUp').addClass('slideDown');
header.classList.remove("slideUp");
header.classList.add("slideDown");
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new_scroll_position = last_scroll_position;
});
</script>*
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