Because of crappy Google code, I have turned off the Content Negotiation. However, this now means that Silverstripe does not validate.
The closest I can get to validation is using the XHTML 1.0 Transitional doctype. However, the CMS is putting in 'align="null"' on inserted images, which does not validate.
How can I get my Silverstripe to validate, while still allowing the use of the Google Website Optimizer?