title: mouseup on the document scroll button
body: <p>This code is working, when the mouse is "UP" in the document: </p>
  
  <pre><code>$(document).on("mouseup", function () {
      alert("mouseup");
  });
  </code></pre>
  
  <p>But how to make <code>alert()</code>, when the mouse is UP on the scroll button? </p>