Changing VB's DOCTYPE to XHTML Strict - problem?

[Piranha_Studios]

Thanks, that's interesting but I think you misunderstand me.

I don't want (well, don't have the time unfortunately) to re-write the tabled portions of vbulletin. I literally just want to change the doctype to strict, even if that results in the forum itself being non-compliant, as the page header which is common to other pages on the site relies on this doctype to make browsers display it correctly.

Our style will mainly be only color changes to the default template and will still be transitional. So I was wondering if doing this to the existing vbulletin leaving its current code intact would cause any problems in terms of how the forum displays.