forcing doctype when calling validator?

Hi,

Is there a parameter that can be fed to the validation script to force the
doctype for a page? (or better still, suggest a doctype which will be ignored
if one is present in the supplied markup?)

I'm using Opera for my main web browser which has a nice built in validation
feature - but 99% of code out there has no doctype at all, so the validator
just refuses to attempt anything. I'd like to at least be able to suggest a
default that would result in the validation script attempting to validate the
code...

cheers

Jules

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