Actionscript 3.0: a steep learning curve

Arrgh! I'm trying to broaden my skills by creating some Flash-based packages for the website. I've created one which is a simple newsmap which I want to upgrade to include an RSS feed reader. The problem is that the newsmap was written in Actionscript 2.0 and the code for the reader is in Actionscript 3.0, and the two don't go together easily. I've managed to upgrade the map part to run in AS 3.0, but the reader part just doesn't work. You can see the full newsmap/rss reader package in this link.

I've tried a couple of forums but I've had little joy, so if anyone can help I would be massively grateful.