The link below takes you to Argo Olympics a new browser game that Codemasters have created to introduce the new game 'Rise of the Argonauts' The quality of graphics is second to none for a browser game.
There’s a variety of games you can play separately such as the 100m dash, Long Jump, Archery, Hammer Toss and Javelin Throw before entering yourself into the main competition; (you can have your scores posted online if you wish). It’s well worth a go in my opinion (and I'm not really into browser games).