Exception on multi-forms with ckeditor

I ran the following javascript in a page that contains several forms,
each contains a textare element.
i got an exception "undefined" in the second,
any ideas why?

javascript:

try
{
   CKEDITOR.replaceAll( function( textarea, config )
   {
      if(textarea.className == "no_editor") return false;
               
      var toolbar_line1 = ['Bold','Italic','Underline','-','NumberedList','BulletedList','-'
                  ,'Outdent','Indent','-','JustifyRight','JustifyCenter','JustifyLeft'
                  ,'JustifyBlock','-','BidiRtl','BidiLtr'];
      var toolbar_line2 = [ 'Link','Unlink','Anchor' ];
      var toolbar_line3 = ['Styles','Format','Font','FontSize' ,'-', 'TextColor','BGColor'];
      config.toolbar = [toolbar_line1,toolbar_line2,toolbar_line3];
                     
      return true;
   }
   );
}
catch(err) { alert("Error: " + err.message); }