For now, the multimedia elements of this site are based on Quicktime3 from apple. It is a free download. You install (follow the directions) it then drag the enclosed plug-in to your browser's plug-ins folder.
The following information is from the apple quicktime site.
Apple's QuickTime Plug-in for Netscape Navigator and Microsoft Internet Explorer lets you experience QuickTime content directly in the browser window. You no longer need a separate helper application to view QuickTime content over the Internet. You can also view QuickTime VR panoramas and objects right in your browser. And because the QuickTime Plug-in supports streaming, there's no delay - you can begin viewing the video immediately. More information is available on the QuickTime Plug-In page.