encoding problam with jQuery and CI

encoding problam with jQuery and CI

hello mates

i want to make an add-comments-form with jQuery.
therefore i writed this JS:

<script type="text/javascript">
   $(document).ready(function() {

      $("#commentF").submit(function () { return false; });                  
      $("#comment input[@type='submit']").click(function(){
            $.post("<?=site_url_rel("show/comment/".$game_id)?>", {content: $("textarea").val()}, function(xml) {
            var content = $("textarea").val();
            $("#comment").html(
            "התגובה התווספה בהצלחה"
            );
         });
      });
   });
</script>


now, this is my html:

<div id="comment" style="display:block; float:right; width:30%; margin-right:15px;">
<h1>הוספת תגובה</h1><br />
<form id="commentF" method="post">
<br /><textarea name="content" maxlength="300" class="big_txt" value="sdf">עברית</textarea>
<br /><input type="submit" name="send" value=" שלח תגובה " />
</form>
</div>


and that the php code inside my controller (i am useing codeigniter):

function comment($item_id)
{
   header('Content-Type: text/html; charset=windows-1255');

   $comment = $this->input->post('content', TRUE);
   //if (trim($comment) == "") show_error("עלייך לכתוב תגובה ישמוק");

   $data = array('cmnt_itemid'    => $item_id,
            'cmnt_item'    => 'game',
            'cmnt_content' => $comment,
            'cmnt_date'    => 'היום'
   );
   $this->db->insert('comments', $data);
   return true;
}


everything is ok, BUT- the $comment data that i get is in japanease or whatever, even though i added a header with my encoding. why is that?

thank u guys