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// Sticky Header
$(window).scroll(function() {

    if ($(window).scrollTop() > 100) {
        $('.main_h').addClass('sticky');
    } else {
        $('.main_h').removeClass('sticky');
    }
});

// if you want to add stick menu on custom div scroll

$(window).scroll(function() {

    if ($("your_div").scrollTop() > 100) {
        $('.main_h').addClass('sticky');
    } else {
        $('.main_h').removeClass('sticky');
    }
});