In the code, I see this (currently blocked by flashblock) srcattribute="./soundmanager2_flash9.swf"

This looks like JavaScript controlling a Flash object, not just JavaScript.

Same here. I have flash blocked and I cannot see anything.

Not sure what you're talking about. This is plain Javascript.

I don't believe it is. I have click-to-play for plugins, which means that JS runs without issue, but I have to specifically allow any plugins, e.g. Flash.

I get the same thing as parent when I visit -- black boxes -- along with an indication in my address bar that plugins have been blocked.

Looking further at the source on index.html, I see this:

    soundManager.url = './'; // path to directory containing SoundManager2 .SWF file

So this is very obviously just a shell around a Flash file.