Looks good, Ian. Seems solid too, but I don't have much experience with PHP. One suggestion I have - maybe it's just me but I would be concerned that some moron would confuse the two menus in the top right as having some sort of relationship with one another. (i.e. "search chevy", "contact dodge", etc.). I'm not really sure what would make a better layout, so feel free to disregard my stupid comments too.

Otherwise, it looks really good. Way better than any site I've ever attempted.