Set error level in Visual Studio 2005?

I have a website I'm working on in VS 2005. Now a lot of the pages were done in Dreamweaver, but all the HTML errors that popup in the error list are really peeing me off. These errors are irrelevant, I couldn't really care if Element 'html' is missing required attribute 'xmlns'.

How do I stop these errors from displaying? I only want serious errors, I can't seem to find how to do it in the options, and help doesnt offer any suggestions either.

ThanksLook for the page's TargetSchema property.
Is there not something I can set at the application level? I have like 300 pages in my project...
Best you can do: They are warnings, ignore them.
Thing is, the 'serious' errors will prevent the application from compiling anyways. You'll see them with the exclamation mark next to them.