Replaying a bunch of steps...can I use Rails, or would Flash be better?

I run a website that has various utilities that help people learn to
play poker better. One of the things I want to add is a hand history
replayer. The basic idea is that a person uploads a text file that
represents everything that happened in a hand, and then is shown a
graphical represenation of it. They can move through the action
sequentially, rewind, etc.

To give you an idea, a similar utility can be found at
http://www.pokerxfactor.com/servlet/pxf?t=hand&handid=25004 (flash
required)

Do you think it'd be possible/effective to do this in Rails? I'd like
to do that so it'd be all browser-based and not require any client
code. Plus I can code Rails really quickly and easily :slight_smile: Or would it
be better to go the same route as the site above and do it with Flash?

I'd appreciate any feedback, and am open to alternatives that I didn't consider.

Pat