Broken (blocked?) javascript

I am trying to print labels at the US Postal service web site, here:
http://www.usps.com/shipping/label.h...1home&page=cns
This link from their home page redirects to a page where you can try to
print either a 'Domestic' or 'International' label. Neither one works
for me. I have tried IE7, Firefox, and Opera. I had disabled scripting
protection in McAfee, then actually uninstalled the whole McAfee
security suite just to make sure it wasn't blocking it. I have
uninstalled all anti-spyware applications, and have double- and
triple-checked to make sure JavaScript is enabled in every browser.
Pop-up blocking is turned off everywhere, and I have tried changing
security settings to the lowest level, all to no avail.

The sample print links, by the way, load up a PDF file. I had Acrobat
Reader 7, and have since uninstalled that and installed Acrobat 8, plus
2 re-installs of 8 after each installing Firefox and Opera. I am out of
ideas and am going insane with this. I have no problem when I try to
print them at work with virtually the same setup. This is XP SP2, IE7.

Does anybody have any ideas?