Modification dropdown list of child productsVirtuemart 2

1. Some changes to showing a child products with the balance (custom field type Generic child variant) in the flypage Virtuemart 2.0 so drop-down list to present a thumbnail image of the child products. Screenshot from the desired result is attached. 2. Should be possible to adjust the size of the thumbnail image (within reasonable limits from 50 to 100px wide). 3. The drop-down list should be cross-browser and work just as well on mobile devices. 2. It is desirable that these changes apply only to the Joomla 2.5/Virtuemart 2 template. 3. No other functions that can affect the correct operation of Virtuemart 2.0 must not be altered or affected. 3. All changes must be commented in the code, as well as have the instructions for replacing the file / install.