I have allready been looking around, but no luck... I also tried to do it with png's, but as you said, that gives huge filesizes.
I'm now looking into the 'skin' method, and I think I will have to stick with that. If anybody here knows how this is done, PLEASE TELL ME!! If not, I will go and ask over at spoono. I actually got the idea from looking at their site...
This is going to be a long and difficult project...