Always worth doing a W3C validator check though and fixing as much as you can (specifically the red errors). Do the check on every page of your site...
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The errors showing are mainly <tag> items that I used to adjust text sizes, and some " " items. The ";" seems to get filtered out shows the error, but it's displaying as intended.
Very nice site. May I make one small suggestion? It is just a personal preference thing, but the pink color (#CCAACC) is taking away from the professionalism of the site (IMHO). I'd suggest replacing the pink with the salmon color (#BE7A7F) to match your customer's business sign for better consistency.