Just installed fine on a site I am building. Well, OK I had forgotten a css file but that is now rectified. The more complete version is attached.
Looking at your site I suspect that the reason it doesn't work is the version of jQuery that is loaded on the site. That is an OLD version :-) Some of the stuff that jqzoom use were introduced in version 1.2.6 . That was a long time ago.
You need to update your version. You can download a recent version easily enough but I would think about using a version from a CDN - either jquery themselves or google. If you search for something like 'loading jquery from google' you'll find information. Others may disagree with this but to me it makes more sense.
And for anyone else trying this - you will need to have jQuery loaded on the site one way or another. That is not included in the files so you will have to make it happen if it is not already loaded.
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