video resolutions

Hello,

I'm working on creating a small HD video hosting site, mainly my own videos. I shoot my videos. I'm able to upload videos to a nod, using video module. The encoding is done using ffmpeg 1.2.

I would like the client to have 2 choices to view the video content in. One format would be the main high definition, the other would be a lower resolution. Not necessarily with an alternative codec, just smaller dimensions.

The client would also need to be able to interchange between the 2 resolutions, using controls with in the player. Much like in Vimeo.com.