title: How to use jQuery's ScrollTop function with em valuse?
body: <p>How do I make this code work with <code>em</code> values?</p>
  <pre><code>$(window).scroll(function() {
    if ($(window).scrollTop() &gt; 100) {
      $('#scroller').css('top',$(window).scrollTop());
  }
  });
  </code></pre>
  <p>I want the 100 to be 10em, how can I do it?</p>