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It will be exactly like stock quote chart available in most finance website, ie: stock price changes every a few seconds automatically without refreshing the page.
(Script language + AJAX or Flash implementation preferred)
You'd probably want to use Ajax/JS if the data comes from an external site to refresh the values every few seconds. I'd be very frugal about what you do if you do this every few seconds, refreshing a few bytes of text would be OK but if you redraw the graphic every few seconds it could be intensive on your server, or intensive on the client if you use Flash.