Change textarea value from iframe

I have 2 files. a.html and b.html. a.html contains iframe with source b.html and 2 textareas (1 wysiwyg textarea and 1 standard textarea. b.html contain 2 buttons, button 1 to change textarea 1 value and button 2 to change textarea 2 value but button 1 not working.
Please help
a.html
<script type="text/javascript" src="http://ift.tt/29esVi2; <script type="text/javascript">
bkLib.onDomLoaded(function() {
new nicEditor({fullPanel :...
HTML:
Change textarea value from iframe

from JavaScript http://ift.tt/297l2Yj
via IFTTT
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