title: Click image opens popup
body: <p>So what I wanna do is to click an image, which opens up a popup window with the image-URL in a textfield. Here is should be possible to change the URL and by that changing the image-URL.</p>
  
  <p>Im very poor with javascript and thats why im asking for help.</p>
  
  <p><strong>HTML</strong></p>
  
  <pre><code>&lt;img src="#" onClick="changePicture();" /&gt;
  </code></pre>
  
  <p><strong>Javascript</strong></p>
  
  <pre><code>function changePicture() {
        var myPopup = window.open("", "", "width=200, height=100");
  }
  </code></pre>