iCal won't let me sync "on my mac" calendars to Googlemail CalDAV

Hi there

I've read various hints and advice on how to achieve this, but I still struggle.

iCal 4.0.4

OSX 10.6.8

Issue is as follows:

I set up may googlemail account and it syncs with iCal fine (at least it imports calendar from google) - it shows as CalDAV account in the settings.

But the other way around doesn't work at all. I have many calendars listed unter "on my mac" which I cannot get to sync with google calendar.

When I click on "delegates", these "on my mac" calendars just don't show up - just the ones I have in google.

So how do I get my local "on my mac" calendars into the google calendar? "publish" doesn't work as well...

Would be great if someone could le me know, how do acheive this!