You mean an animated intro? Like a short “welcome-movie”? Alright, to do that you´re gonna need a program to animate. I recommend adobe flash. Once you´ve made an animation in flash you save it as an swf-file (That´s the normal file for flash-products). I think you can upload an swf-file to a site just like you would upload an image but I´ve never tried it so I´m not sure.
But listen, let me give you an important advice. And this is a big advice. In fact I think it might be one of the most relevant pieces of advice that you will ever get from this thread. Do I have your attention? Ok. Do not make an intro-page. If you look up enough top-10 lists of bad things to out on a website you will find intropages has ranked high more than once. Intro-pages are cool the first time you go to a page but in the long run they just become annoying. They consume time for the page-viewer. Page-viewers don´t like to have to wait when they go to a site. In case your client has already made up his mind then ok, that´s the clients problem, not yours, but try to talk him out of it.
Loke – Don’t presume to know what the person wants based on such little information.
Intro pages are FINE, provided they’re not SPLASH pages. A well written, ‘static’ intro page that doesn’t show a list of blog posts is perfectly fine, and is NOT on any top-ten list of bad site habits. I will grant you, SPLASH pages (i.e. welcome shockwave thingies) ARE horrible.
Oh, I guess I misunderstood then. My bad.
