A small comment from me: Make small thumbnail images of the horses in a paint package and use those on your menu pages (sale.html, mares.html etc). (At the moment you're using the full-sized images, and resizing them in HTML with the IMG WIDTH and HEIGHT tags.) Then make these thumbnails link to the full size images. This will make the page load much faster.
Overall I think the site is great!
Best wishes,
Matt
Elated

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Matt Doyle, Elated
3rd Edition of my jQuery Mobile book out now! Learn to build mobile web apps. Free sample chapter: http://store.elated.com/