If you're doing it in flash, then that's a different story. You can do two separate HTML files with separate .swf files embedded in them -- or you can do 1 movie, with two scenese, and link them like I said above in flash (gotoandplay scene 2). The benefit of two files is that it may be faster to download each one separatly -- the downfall is that you may not get to do all the effects, and essentially, you're splitting your movie up -- this all depends on what you think is best for the project. Do you have it up yet?
// Art is what you can get away with.
<-- Andy Warhol