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How it work:
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On the category page, place the mouse on the product image, appeared arrows use for scroll through all the pictures of product. Work like a slider.
Implemented without the original image-loading.

No additional queries in the database. A slight modification of an existing query to obtain the products category.
No further Ajax calls.

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Features:
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Allows the client to review all product photos without leaving the category page.
Can be adapted to not default template.

Installation for version 3.0.3.7 - http://docs.opencart.com/en-gb/extension/modifications/