I really like the idea, but when checking out pushuptheweb.com...in firefox3 on linux the icons (that show a demonstration) do nothing when I click them...when

I really like the idea, but when checking out pushuptheweb.com...in firefox3 on linux the icons (that show a demonstration) do nothing when I click them...when I fire up IE7 in vmware my script debugger yells, "Object doesn't support this property or method" Is it because I am using up to date browsers? I still want to see a demo... This isn't going to help my grandma upgrade her browser.