Drill Down Menu doesn't work on first page of site

[Cebalrai]

1) Script Title:
Script: Drill Down Menu (v1.6)

2) Script URL (on DD):
http://www.dynamicdrive.com/dynamici...lldownmenu.htm

3) Describe problem:


Hello,

I have a strange problem with the named script.
It runs nicely on each page of my site except from the very homepage.

So, when I have http://myurl
it only displays first level links. No sublinks, no triangles.
Every other page like http://myurl/index.php?anzeigen=seite2 and so on works as expected.

Firebug Concole gives me this error:

$anchorlink.parents("ul:eq(0)").data("specs") is undefined
http://myurl/drilldownmenu.js
Line 110

I'm not the Javascript/jQuery guru so I can just guess if it might help to give it an initial parameter somewhere. But I have no idea what and where.

Thanks for helping

PS.: This happens in any browser I use, that's why I didn't specify a particular one. Sorry, files are on a local server (XAMPP) so I can't supply a link here.