Sticky header after scroll

new_gist_file.js

    var stickyHeaderTop = $('#jetmenu').offset().top;

    $(window).scroll(function(){
        if( $(window).scrollTop() > stickyHeaderTop ) {
            $('#jetmenu').css({position: 'fixed', top: '0px'});
            $('#jetmenu').css('display', 'block');
        } else {
            $('#jetmenu').css({position: 'static', top: '0px'});
        }
    });