"frameset" doctype is for pages that use frames
If your pages do not validate XHTML try HTML 1 TRANSITIONAL or no doctype at all.
a doctype tells the browser that the page is coded in a particular coding style eg. HTML/XHTML (transitional/strict)
Again, if the page does not validate in HTML or XHTML do not use a doctype. Browsers are more forgiving if you do not add a doctype.
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