Your code is not valid
I used to care about validation — then I realized the search engines didn’t care about it, so I stopped caring too.
I used to spend hours trying to figure out why something wasn’t validating. Sometimes it would be something stupid like having an ampersand symbol somewhere on the page. The “proper” way to show an ampersand is by writing: & a m p ; (the only way I can get it to display properly here is to add spaces between each letter. Within the HTML, there wouldn’t be any spaces between the letters). Why & a m p ; is the “proper” way is beyond me — it’s longer than simply writing “&” and it requires an ampersand symbol anyway! Go figure.
Anyway, my current philosophy is, “if it looks good, it works for me.” 