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 $(document).ready(function() {
   var scrollOffset = 0;
   $(window).scroll(function() {
    $('.mscroll_animation').each(function() {
      if ($(window).scrollTop() + $(window).height() - scrollOffset > $(this).position().top) {
        if ($(this).hasClass('m_active')){
          $(this).removeClass('m_active');
        }
        else {
          $(this).addClass('m_active');
        }
      }
    });
 });
  });