It shouldn't take all that much digging to find out whether the asp does stuff in the background, or is simply being used to generate html. (Same goes for php, jsp and so on.) If you save a copy of the static html, does it do everything the real page does?
If it's an elderly site-- your first post makes it sound that way-- it probably does a lot of useless ### that you'd be just as glad to dump. Things like checking whether the user's browser is A (last supported in 2003), B (no longer made at all) or C (renamed in 2007 and therefore not recognized). Or doing things that involve screen size. Or converting input from some long-defunct file encoding to some other long-defunct encoding.