ActionScript 3.0 :: Daisy-chaining Function Calls Gracefully?

I have a video playback system that runs in a loop as it traverses the playlist of videos, doing something like this:On playback start:

-check for pre-roll ad, play ad if set to true; otherwise:
-check for branding video bumper, play bumper if set to true; otherwise:
-play video

On playback end:
-check for post-roll ad, play ad if true; otherwise:
-reset video

The way I have it coded/hacked works fine, but is less than ideal, especially as I plan to build on it. It looks something like this:[code]So, what's a better way to handle this? For an interactive timeline/map I've made in the past, there were a number events that were triggered at certain times during audio narration. Each event was unique (some were animations, others were text labels that appeared, etc), but I unified them as classes with a common 'time' property and common public go() function, and threw them into an array. As the narration played back I would check the 'time' property of the next object in the array, and once it matched I would call the go() function for that event, increment the phase position (so I know which array index to check next), and continue.