Tsunami Aid and Relief website

I am new to Flash and wanted something to make, so I decided to do a website for Tsunami Aid and Relief. I’m going to list information and links to various organizations working in South Asia. And some other information as well. And also planning on making a tshirt you can buy with the website name and logo and all the profits go to aid. I was wondering how do you make the website automatically adjust to the size of the web browser.