How can I write a video play to support playing both 4:3 and 16:9 video

I am using Adobe Flash Builder 4 and I want to write a video player to put in my web page. It should be able to play 4:3 or 16:9 videos. How can I adapt UI when display 4:3 or 16:9 videos? Do I have to convert all old 4:3 video to 16:9 video? If I want to create or convert old video to 16:9 video, do I have to use specific codec or video file format? One final question, Does flv support 16:9 format?
Sorry for so many question cause I'm kinda new to video field? Thanks in advance!

Seriously, it's fully rendered. I'm not an FC ace but I didn't just start using the program. It just happens that this is the first video I'm editing that has both wide and standard aspects. I'm telling you that when I try to export in 16:9 (as in QT conversion, picking a 16:9 output) the 4:3 part on the timeline says it's unrendered, but only while the file/location box is up. If I back out totally the red line goes away. If I go ahead with the export I get a green screened mp4.
Message was edited by: matthewmoore

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