How to open external html files from within a movie?

hey everyone. i’m working on a flash menu and i’m trying to integrate it into an HTML www but i’m having one problem… i don’t know how i can open external html FILES (not actual www URLs) when i press a button in the menu. lets say the menu is located in the window index.html and after pressing a button, i want index2.html to load in the same browser window. how can i do this, assuming that both files are in the same folder?
thx in advance