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NextGen, do you have the option enabled to keep original files?
If that option is turned on then when the visitor views the thumbnail and clicks on it they'll be taken to the medium sized image and then when the click on the medium sized image (or on the link in the details section shown) they'll then be taken to the full size image. In the ACP there is also an option as to whether the full size image should open in the same window or a different window.
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