Complain on <center>

Hi!

As far as I can see, <center></center> is not compliant to the standard. I know it is widely used, though.

I would like it if tidy could complain on the use of <center> or even replace it:

<center>
	<h1>Heading</h1>
</center>

	|
	v

<h1 align="center">Heading</h1>

Best Regards / Mit freundlichem Gruss
Martin Schweikert
-- 
F. Hoffmann-La Roche Ltd.	Division Pharmaceuticals
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