Yes, it really is ready to find.
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But the point is simple, as already said comrade above you can tie the system service review, usually, this JS code.
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The course is as follows (done in FancyBox):
1. When you initialize gallery set callback function.
2. A function which, when opening the image, will add to the content of the image (#fancybox_content for example) your code, let it be for example code VKontake reviews.