I would like the hierarchy of the flash project to go like this:
-Main Intro (with "jump to menu" button)
-Sub Intro (with "jump to menu" button)
Working in ActionScript 2 and CS5.
create a button (insert>new symbol>button) and place it on stage. in the properties panel while it's selected, assign it an instance name, eg (gotoMenu_btn).
click on the frame with your menu and in the properties panel assign a frame name (eg, menu_frame).
you can then attach to the frame that contains gotoMenu_btn (in the actions panel):
While you are right that your project is perfectly doable with Flash, you realize that there are tons of freeware porducts out there that specialize in that kind of requirement ?
Apart from being a not-so-useful exercise in learning an (outdated) programing language version: expect some trouble when you actually burn that CD and want to distribute it to your firends or add it to an online portfolio.