title: Javascript jQuery Call function from parent to .html()
body: <p>on parent i replace div (id formhtml) with html (myhtml.html) using this function  :</p>
  
  <pre><code>$("#formhtml").html('&lt;object data="myhtml.html" id="idform" width="100%" height="100%"&gt;');
  </code></pre>
  
  <p>inside myhtml.html, i have element</p>
  
  <pre><code>&lt;input type="text"  id="t_id_textbox" &gt;
  </code></pre>
  
  <p>i was tried call from function like this</p>
  
  <pre><code>$("#formhtml").html(alert(document.getElementById('t_id_textbox').value));
  </code></pre>
  
  <p>error :</p>
  
  <pre><code>TypeError: parent.document.getElementById(...) is null
  </code></pre>
  
  <p>please help how i get value of <code>t_id_textbox</code> from parent ?</p>