I am trying to to post a comment from a webpage.. Comment web page has textarea and a button type input

here is html of textarea

Code:
<textarea class="aui-field-input aui-field-input-text" id="_33_wgdr_postReplyBody0" name="_33_postReplyBody0" wrap="soft" style="height: 100px; width: 500px;"></textarea>
and here is the way I am writing some text into textarea...