Was mache ich falsch?

[{Paul}]

<script src="https://ajax.googleapis.com/ajax/libs/jquery.min.js"></script>
  <script type="application/javascript">
    $(document).ready (function(){
      $("#trollbutton").hover (function() {
        $(this).hide();
        }, function() {
          $(this.show();
           )
       }
      );
    });
  </script>