This is accomplished in a live way -- so the user will see changes every time an… (more) update request is sent. The updates stop after market is closed, so to see how this thing would behave, please check out: http://www.sanebull.com/test.html
Note: height varies per amount of the quotes, so adjust accordingly.
Note 2: Foreign Exchanges & Mutual Funds are available, please use Yahoo! Finance ticker symbols.