title: change url of already opened popup
body: <p>Is it possible to change the url of the popup.</p>
  
  <p>Assume I open a popup:</p>
  
  <pre><code>function pop1(){
      window.open('http://google.com','wind1');   
  }
  </code></pre>
  
  <p>Can the url of the popup window 'wind1' be changed to say 'http://msn.com'. Something with location.href or any other solution. </p>