The presentations require shockwave, there is a link below where you can get a version for your system if you don't already have it. The cool soundtracks really make these pieces shine. See them for yourself, click on Media here:

http://latah.idahogreenparty.org

If you don't have shockwave you can get it here:
http://sdc.shockwave.com/shockwave/download/alternates/

Its worth taking the time to install shockwave to see this.