I followed the directions here (http://www.mojoportal.com/using-superfish-menus.aspx) but I get the following error:

Microsoft JScript runtime error: Object doesn't support property or method 'supersubs'

on line

<portal:SiteScript id="superfish" runat="server" ScriptRelativeToRoot="/ClientScript/jqmojo/mojosuperfish.js" />
     <script type="text/javascript">
         $(document).ready(function () {
             $("ul.sf-menu").supersubs({ minWidth: 12, maxWidth: 27, extraWidth: 1 }).superfish(
             { pathClass: 'current', pathLevels: 0, speed: 'normal' });
         });
     </script>

which is right before my </form> statement.  I just downloaded mojoPortal last week so I should be pretty up to date.  Help is appreciated.