Embedding a Trooptrack calendar on external website


Is there a way to embed a TroopTrack calendar on an external website. I have racked my brain trying to figure this out. At first i imported the TT calendar into a Google calendar and then attempted to embed that calendar on our Google Sites Pack website. It only works if you are logged into that particular Google account. If you are not logged in to that account, you get a message saying: "Events from one or more calendars could not be shown here because you do not have the permission to view them. "

Thanks for any help you can offer. - Chris