Intro animation for swf games

i’m working on this site. and it has a lot of flash games posted on it. i’m trying to find a way to make an animated intro to all those games(that would play before the game starts), something like they do in miniclip games. i mean an intro with the logo of the site first, so that ppl that download a game from this site can get to see the mini-animated-presentation of the site that hosts the games.
im going to search the internet but if anybody has an idea of how to do that or how to start doing that, or how to start thinking about doing that, i appreciate it.

thanx in advance.