jQuery Tools Srollable, object has no method autoscroll

Question

I'm using the Carousel for Plone v1.6 for a carousel. Initialising the carousel works fine but after that everything fails. I got this code:

var api = jQuery("div.scrollable").scrollable({
   size: 1,
   clickable: false,
   loop: true,
   circular: true
}).autoscroll().navigator({ navi:'.navi > a' });

The browser drops a javascript error which says:

Uncaught TypeError: Object [object Object] has no method 'autoscroll'

Also the navigator method fails. If I drop those two methods and simply initialise the scrollable object, it works.

jQuery Tools 1.2.5 is in use and gets called before this script. I have no idea what could be wrong?!