Re: Draggables and triggerPassenger:

>  I just tried to use triggerPassenger: in an onDrag event. The problem is
> that Firebug sais that argument[0].id is undefined and thus stops executing
> the script.
>  Is that a bug or did I miss something?

#triggerPassenger: only works on a droppable. See the included examples.

Note that in your case there is no point in triggering the passenger,
because you already know it and can reference it from the block.

Cheers,
Lukas

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-- 
Lukas Renggli
http://www.lukas-renggli.ch