Abstract: Electronic commerce over a computer network is facilitated by a computer system that forms a community of computers that enable the users to buy and sell items in an online marketplace. To list the item on an online marketplace website, for example, the selling user posts an item with a seller marketplace item management website by completing an online-item marketplace item creation form. The form requires input related to the item, such as a description, sale price or minimum bid, shipping instructions, and the like, and an image file or image file location illustrating the marketplace item. The seller marketplace item management server provides a marketplace administrator server the marketplace item data including original image file or image file location. The server contains a random image size generator that generates at least two additional images of the marketplace item for display in a seller marketplace item web page to advertise the marketplace item.