At the bottom of every page is a link to the ordering page, which accepts delivery and credit card information and displays a completed order form based on what went into the shopping cart. Thumbnail Galleries Nothing to this one. You display a bunch of postage-stamp size images on a page. You can compress thumbnails to between 5K and 10K, where the full image would occupy between 45K and 100K or more. Put a text link as a caption to each thumbnail, so impatient visitors can get right to the pictures they want, and say how big the file will be in each caption.
People like to browse catalogs.
Browsing requires fast rendering of each page. That means very small data volumes, which in turn means even a thumbnail version of a photograph is too much. Visitors may want to download a picture for a variety of reasons. It may be an assembly diagram for a gadget they bought from you. You may show photographs of your merchandise, as many on-line catalogs do.