I want to be able to allow users to pick from one of several custom skins that I'm going to design, all bassed on the current custome skin and the only differences will be .css ones. I know I can copy the custom skin folder rename it and make changes to the .css. But then if I make a change to the main.php or other file in one, I'll have to make it in the others. Right?

So is there a way that I can keep the same "skin" but offer users different choices of style sheet?