This has probably been asked a lot, I have tried searching but I think I keep searching for the wrong words.

What I have done: I have downloaded a TS3 theme built by another community, I have started editing it by means of replacing the images so that it reflects our clan instead of theirs. What I need to know is; How do I now repackage the theme into a "Skinname.ts3_style" file so that I can give that file to the rest of my clan to install on their Teamspeak?
What is used to compile that installer / archive ? Anyone got an easy "How to guide" to do this?

Please help