title: jQuery / JavaScript: Check if number is greater than another number by a minimum amount
body: <p>I have a function that fires only if a user has scrolled left or right, by doing the following: </p>
  
  <pre><code>var currentScrollLeft = visibleArea.scrollLeft();
  
  visibleArea.scroll(function () {
      var newScrollLeft = visibleArea.scrollLeft();
  
      if (newScrollLeft &gt; currentScrollLeft) {
          // do something
      }
  });
  </code></pre>
  
  <p>But this fires after even the slightest change in <code>scrollLeft</code>. Is there a way I can tell it to only fire if it's moved more than a certain amount, say <code>50</code>?</p>