How do I get my picture from six flags online?

We bought pictures from our trip on the Titan and they gave us a card saying since we bought our pictures there we could get a free internet download of it, but they gave us no site to go to. I have checked threw every six flags site and I have my image number but I just don't know where to go. Does anybody have any clue where I go to get the photo, I really want to put it on facebook soon.