title: Prompt whether to re-use an existing popout window or create a new one
body: <p>I should preface this with the fact that I know virtually nothing about javascript and, apart from very rare situations like this, I don't really plan on using it much. So please forgive me for not having tried to learn more about it in order to try and solve this problem for myself.</p>
  
  <p><strong>The Situation:</strong>  </p>
  
  <p>I frequently like to make use of popout browser windows. To do this I created a bookmark in my browser that contains this small piece of Javascript I copied from somewhere – I can't remember where – and adapted to suit my screen:</p>
  
  <pre><code>javascript:%20var%20WindowPopup%20=%20window.open(window.location.href,'PopUp','left=1150,top=830,width=660,height=410,scrollbars=yes,location=no,status=no');
  </code></pre>
  
  <p><strong>The Problem:</strong> </p>
  
  <p>As things stand, when there is an existing popout window and I select the bookmark again, the same popout window is re-used if I'm at the same site, otherwise a new popout window is created. But there are many occasions when I would like to override this default behaviour.</p>
  
  <p><strong>Three Qustions:</strong>  </p>
  
  <ol>
  <li><p>How can I force popouts to always open in a new window?</p></li>
  <li><p>How can I force popouts to always re-use an existing window?</p></li>
  <li><p>Combining the previous two options: is it possible to detect if there is an existing popout window and prompt me as to whether I want to re-use it or open a new one?</p></li>
  </ol>
  
  <p>Your help will be greatly appreciated.</p>