Offering 2 formats when you shoot HG is always a good idea.. I rarely watch HD stuff online because the bandwidth out here in the country isn't very good..

On the original question, page validation is not a requirement, its a suggestion.. If a page doesn't validate 100% but still renders for visitors, I wouldn't worry about it too much..

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Steve : Animal Charms Animal Jewelry | Fishing Blog
I'm smelling a whole lot of if coming off of this plan.