Redoing my website. Flash or Javascript?

Prospective clients - I shoot sporting events and fundraisers for local nonprofits. My work is used by them in advertising and promotion. The largest staff of any of my clients is 10 people.

I capture the competitiveness of the sporting event participants,, the enjoyment (and spirit) the participants have during the event, the participants interacting with the sponsors in attendance (value to sponsors), and the cause itself.

Those are the things I want to get across to potential clients. SEO is very important, as is a professional look, obviously.

Thanks for the excellent question, BAK