How to create a calendar on a specific CalDAV account

You can easily create a calendar in ical with something like this:

set mycalendar to "New Calendar"

tell application "iCal"
	if (exists calendar mycalendar) = false then
		create calendar with name mycalendar
	end if
end tell

But what if I want to create this calendar on a specific CalDAV account, how would I do?

AppleScript: 2.0.1
Browser: Safari 528.16
Operating System: Mac OS X (10.5)

no ideas?