If you are unsure about 'supplier', think I'd open and inspect the .htm files as well as the .js file in a text editor - that will disclose all. The index.htm file is the supplier's attempt at a default page on a Linux server (hmmmm, they should know that most Linux Apache servers use index.html). So the index.htm file and the default.htm files probably contain the same. Bet they point to 'main.htm' which loads the 'main.swf' and the .js file.
Anway, you can launch those with a workstation browser, once inspected. Unless you have some adobe product, one cannot inspect the .swf files (shockwave flash).
If doing that, think I'd use opera or even chrome browsers ... not IE and not Firefox.
'spirit of sharing', Ken