The TEXTAREA id ... was not found since RC3

Hi, I use following js code in my file

<script type="text/javascript">
window.onload = function()
{
var oFCKeditor = new FCKeditor( 'bio_groupe' ) ;
oFCKeditor.BasePath = '../bo/modules/fckeditor/' ;
oFCKeditor.Height = '300px';
oFCKeditor.Width = '470px';
oFCKeditor.ReplaceTextarea() ;
var oFCKeditor2 = new FCKeditor( 'memo_album' ) ;
oFCKeditor2.BasePath = '../bo/modules/fckeditor/' ;
oFCKeditor2.ReplaceTextarea() ;
oFCKeditor2.Height = '300px';
oFCKeditor2.Width = '470px';
}
</script>

and following PHP code :

<div id="cadre-gauche"><textarea id="bio_groupe" name="bio_groupe"><?=$bio_groupe?></textarea></div>

<div id="cadre-album-gauche"><textarea name="memo_album" id="memo_album"><?=$memo_album?></textarea></div>

I did not encounter any trouble with RC2 but since I'm installed RC3. My browser shows these javascript errors :
Error: The TEXTAREA id "bio_groupe" was not found.
Error: The TEXTAREA id "memo_album" was not found.

And I cannot see the content of my fckeditor windows.