Hi,
your website includes jQuery Conflict.
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Which prevents facebox to run. I am surprised it only doesn't work in IE9 though, it was supposed to give problems in all browsers.
Your website is loading multiple jQuery libraries in a single page which leads the jQuery conflict. You should eliminate the 2nd one. Because jQuery library must be loaded before ALL js files, (usually at top position, so 17th line is a perfect position to load jQuery which gets loaded by Virtuemart officially, but the second one is being loaded in 297th line, which is absurd. You should eliminate it.)
See the screenshots below:
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And
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Forum supports.
Regards.