Hey presser, I just saw this thread, are you using Swish? it looks like all swish effects.. drop me a line if you are, I can help you out with a "trial" version of flash. What you're talking about doing is totally possible with the bodybuilding guy. I thing you have to make sure of though is that you either have a "skip intro" button on that, or even better you use a cookie to see if anyone logging in has already seen that intro, and then they won't have to watch it again.
You know I have done something already that sounds exactly like what you mentioned you want, it is at work though, and I'm home, I wish I would have seen this at work. When I get there monday I will take a look at it and see if I can adapt it for you in something really quick.
I told you I will be busy for the next month, but it's not often I get to help people out on something that I actually enjoy and have alot of interest in, so next week I will really try to make some time to work on this for ya.