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HTML

              
                <div id="header">
  Haha, I am a header. Nah.. Nah na na na
</div>
<div id="longDiv">
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed sed nibh nibh, ut volutpat turpis. Aliquam at nunc nisl. Curabitur sit amet lectus eget ligula interdum molestie. Vestibulum ultricies tortor eleifend mi luctus lacinia. Aliquam augue felis,
  tempus ac mattis ac, volutpat id sapien. Sed at arcu orci, ac sodales mi. Sed erat sapien, feugiat auctor dapibus sed, rutrum quis urna. Donec pulvinar mollis ligula quis tempus. Sed consectetur purus id ipsum volutpat fringilla sagittis est sodales?
  Integer quis mollis eros! Morbi quis dignissim est. In quis sapien mi! In vestibulum, leo et pellentesque consectetur, turpis metus vehicula ipsum, vel facilisis est lectus non orci. Donec aliquet lacus vel tellus semper luctus. Lorem ipsum dolor sit
  amet, consectetur adipiscing elit. Cras erat eros, scelerisque ac rhoncus eu, dapibus non magna. Fusce ante erat, sollicitudin id fringilla ac, viverra id turpis. Suspendisse sed nisl justo, quis elementum dui. Class aptent taciti sociosqu ad litora
  torquent per conubia nostra, per inceptos himenaeos. Cras interdum, nisi non placerat elementum; nisl turpis feugiat lectus, eu blandit metus arcu vitae nunc. Proin egestas, tortor ullamcorper mattis luctus, sapien augue rhoncus erat; vel cursus quam
  purus lobortis velit. Etiam posuere hendrerit nunc id volutpat! Quisque tempus libero sed leo pulvinar sed adipiscing justo volutpat. Integer consequat semper semper. Cras tincidunt nunc id quam pulvinar id rhoncus neque dictum. Pellentesque turpis
  sem, semper eu accumsan eget, tempor tempus ligula. Quisque feugiat luctus enim, vitae dictum lectus fermentum ut.
</div>
              
            
!

CSS

              
                #header {
  top: 15px;
  left: 50px;
  position: absolute;
  width: 100px;
  height: 100px;
}

#header.pinned {
  position: fixed;
}

#longDiv {
  margin: 100px 0 0 0;
  width: 1000px;
  height: 2000px;
  border: 1px #000 solid;
}

              
            
!

JS

              
                var banner = $('#header'),
spot = $(this).scrollTop();

$(window).scroll(function() {
  
  var place = $(this).scrollTop(),
  moved = $(this).scrollLeft(),
  vertical = spot != place,
  stuck = banner.hasClass('pinned');
  spot = place;

  if (vertical) {
    banner.removeClass('pinned');
    if (moved) banner.css('transform', 'translateX(' + moved + 'px)');
  }
  else {
    banner.attr('style', '');
    if (moved && !stuck) banner.addClass('pinned');
  }
});
              
            
!
999px
If you get tired, be like an AJAX request and REST.

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