AutoNav Question with regard to the start level

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Hi all!

As we all know, by adding:
$a = new Area('Header Nav');
$a->setBlockLimit(1);
$a->display($c);

to the template I get the basic Autonav. How could I add a second one in the template (somewhere else) which starts at level 2? Did not find it in the api, but perhaps I was temp. blind ...

And No, I do not want to add it later by adding an autonav block while editing the site.

Thanks in advance!
Regards,
André

nforcer