Strange buy button problem

So, yesterday I set up a "Prints" page on my viewbook website. From home, and my office, the button works as normal. However, today, none of my friends spread all around the country (all different computers, OSs, browsers) can't get it to work. The button shows up, but it just doesn't do anything... I've checked flash blockers, firewalls, javascripts, and everything else I could think of that may be the problem; no luck however.

Any suggestions about what may be going on?

Thanks in advance.
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