Try prefacing your referance to "creator" with the window it relates to like:

s = win.creator.location.toString();

>Hi,
>
>When client script debugging is enabled in IE, I receive an error message but the script works fine (i.e. the parent form location changes and the form is refreshed).
>
>The script is very simple. It looks like this:
>

><script language="javascript">
>        function ParentRefresh()
>        {
>                s = creator.location.toString();
>                n = s.indexOf("#");
>		
>		if (n > 0)
>			s = s.substring(0, n);
>
>		creator.location = s ;
>	}
></script>
>

>
>The error message is "creator is undefined", but as I´ve said before, the script works.
>
>Any ideas?
>
>Thanks in advance,
>
>Eugenio