If the animation is jerky, try the simpler version; if you see nothing, try the GIF version.

This card uses SVG, a new standard, animatable, interactive vector-graphics format. From the above link you can reach their list of implementations. In particular, for Microsoft Internet Explorer 4.x or later (Windows or Mac), and Netscape Navigator 4.x (Windows or Mac), Adobe supply a plug-in gratis. There's even a beta version available for Linux. Mozilla has a programme for adding SVG to their browser, but it is still at an early stage.