Add value to textarea in child window
<p>I have a remote url that is opening with window.open(url), in that page there is a textarea, i want to change the value of that textarea from my parent page.</p>

<pre><code>window.open("http://facebook.com/share.php?u=
                http://something.com&amp;t="+txt,'facebook','height=400,width=550'); 

$("textarea#u_0_6").val('test');
</code></pre>

<p>thank you</p>
