Olá Isabel,
you should try to get rid of the frames and use the strict doctype.
Don't change the overall structure of the site and nor users neither
search engines will be upset with the redesign ;-)
Like Christian mentioned you could use a php include for the header.
then use ids on the body tag to highlight navigation via css. That
saves a lot of headaches and gives the user a much better experience
than the actual site. But it would probably better to redesign the
navigation structure as well and to add some more levels...
If you still want to extend the dtd, use XHTML 1.1 and modify the
driver. (You should serve it as application+xml, but I won't think
to much about that, even if it isn't conform with standards).
To do that:
1.) Download the driver:
http://www.w3.org/TR/xhtml11/xhtml11_dtd.html#a_xhtml11_driver
2.) Modify it.
3.) Let the Doctype point at your custom driver and add your
modifications to the description.
I'd choose the php include way.
And please, don't let it blink so much ;-)
Boa sorte!
Martin
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