jQuery: How do I calculate the distance a particular element is from the top of the page?

The exact application I have in mind is to create a "sticky nav" for my website: where the nav bar is positioned in the normal document flow, but once you scroll to a certain point it becomes fixed to the top of the window.
Let me know if you need more details. Thanks!
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Mikkel SandbergFront End DeveloperAsked:
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Mikkel SandbergFront End DeveloperAuthor Commented:
Never mind, I figured it out. But just so others can see how I did it, here's my code:
  // handles sticky nav
  var stickyNav = function() {
    $(window).scroll(function() {
      if($(window).scrollTop() >= $(window).height()) {
        $('.navUl').addClass('fixed');
      } else {
        $('.navUl').removeClass('fixed');
      }
    });
  }

  // initiate sticky nav
  stickyNav();

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Mikkel SandbergFront End DeveloperAuthor Commented:
I found the solution on my own.
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