$(window).on("scroll", init_scroll_navigate);
function init_scroll_navigate() {

    /*==============================================================
     One Page Main JS - START CODE
     =============================================================*/
    var menu_links = $(".navbar-nav li a");
    var scrollPos = $(document).scrollTop();
    scrollPos = scrollPos + 60;
    menu_links.each(function () {
        var currLink = $(this);
        var hasPos = currLink.attr("href").indexOf("#");
        if (hasPos > -1) {
            var res = currLink.attr("href").substring(hasPos);
            if ($(res).length > 0) {
                var refElement = $(res);
                if (refElement.offset().top <= scrollPos && refElement.offset().top + refElement.height() > scrollPos) {
                    menu_links.not(currLink).removeClass("active");
                    currLink.addClass("active");
                } else {
                    currLink.removeClass("active");
                }
            }
        }
    });

}