Hi,
After enlarging the product picture, the zoom effect function should have stopped working. (we tried it but encountered some unexpected results, so we decided to avoid it)
But I am seeing you have touched some of the JS lines that were used to stop it.
See the LightMart Live DEMO to see the normal behavior:
demo.flexiblewebdesign.com/lightmart/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=68&Itemid=547
To stop running the ZoomEffect after enlarging, open the product details php file on your server and see the screenshot:
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If you don't know what you are doing (or don't enough enough knowledge on JavaScript) don't touch any JS lines.
Regards.