Superfish + supersubs with virtual URL (urlRewriter)

Superfish + supersubs with virtual URL (urlRewriter)

Supersubs stops working on all browsers and causes an "Object doesn't support this property or method" in IE 8 (probably 7 as well) on my product pages that use a rewritten url.
 
 
The menu works as expected at higher levels:
 
 
Does anyone have any suggestions as to how to fix this?
 
This is the code on my master page which I am using:
 

< link rel ="stylesheet" type ="text/css" media ="screen" href ="../App_Themes/ElementalShane/superfish.css" />

< script type ="text/javascript" src ="../scripts/jquery-1.3.2.min.js"></ script >

< script type ="text/javascript" src ="../scripts/hoverIntent.js"></ script >

< script type ="text/javascript" src ="../scripts/superfish.js"></ script >

< script type ="text/javascript" src ="../scripts/supersubs.js"></ script >

< script type ="text/javascript">

$(document).ready(

function (){

$(

"ul.AspNet-Menu" ).supersubs().superfish({

delay: 500,

// one second delay on mouseout

autoArrows:

true , // if true, arrow mark-up generated automatically = cleaner source code at expense of initialisation performance

dropShadows:

true ,

speed:

'fast'

});

});

</ script >