Buffering a Mpg file

Hi,

I am presently involved in developing a search engine for Mpeg.. am doing it in ASP/SQL server.
We want to implement a buffering method, by which the entire file is not downloaded to the client end, but just a chunk of file is buffered toclient end and the client plays it from the buffer, and this buffer is asynchronously, updated.

Some thing similar to lot to mp3 sites, where you run a particular song online, using this buffering architecture.If we have to implement that, do u have an idea, what would be the suitable technology to go about

Any help on this will be greatly appreciated.

Thanx and Regards
Selva