Solution is here
http://drupal.org/node/235972 [2]
#21 has a patch that I confirm is working for all versions. Apply it to the tinymce.module file.
It's only one line so you can do it manualy too.
replace on 187:
document.write(" <div> <a href=\"javascript:mceToggle('edit-$textarea_name', 'wysiwyg4$textarea_name');\" id=\"wysiwyg4$textarea_name\"> $link_text </a> </div>" );
$('#edit-$textarea_name').after(" <div> <a href=\"javascript:mceToggle('edit-$textarea_name', 'wysiwyg4$textarea_name');\" id=\"wysiwyg4$textarea_name\"> $link_text </a> </div>" );
Links
[1] https://dominiquedecooman.com/blog-topics/drupal5
[2] http://drupal.org/node/235972