Unfortunately Fotomoto will not work on Wix websites as they don't allow the needed JavaScript to be inserted in to the page code.
We would be happy to see Fotomoto work on Wix; if you're a Wix user and want to be able to use Fotomoto to sell images on your HTML5 Wix site, please post your comments and "vote" for the Wishlist post at http://www.wix.com/support/forum/html5/editor/wishlist/html5-javascript-support.