Submenues slide-effect missing

Hi CEd
Since I'm very happy with your module I installed it again on this site and styled it with the params plugin: www.sinfonietta-schaffhausen.ch

But as you can see, the submenus just popout - I'm missing the nice slide effect. Do you know where the problem comes from? Perhabs it's a js-conflict or something?

Thanks very much for your help and kind regards,
Dave

EDIT: I use Joomla 2.5.11

Hi
you have a JS error in your page, it may break the maximenu script, so you must fix it

TypeError: el.nodeName is undefined
www.sinfonietta-schaffhausen.ch/template...ssmenu/ja.cssmenu.js
Line 145

Wow amazing, you're superfast! That was it - it works now. Thanks very much for your help!
Regards,
Dave