title: pass a javascript variable from an iframe to the parent frame
body: <p>So I have a variable in my iframe like so:</p>
  
  <pre><code> &lt;script&gt;
  var zipphone = "&lt;?= $phone ?&gt;";
   &lt;/script&gt;
  </code></pre>
  
  <p>Now I want to pass that variable to the parent frame after the iframe is loaded.  What is the simplest way to do that?</p>