suggested link for valid xhtml

After validating a document at http://validator.w3.org/, it was suggested to
put this fragment of html in my document to advertise it being a valid xhtml
1.0/strict document:

  <p>
    <a href="http://validator.w3.org/check/referer"><img
        src="http://www.w3.org/Icons/valid-xhtml10"
        alt="Valid XHTML 1.0!" height="31" width="88" /></a>
  </p>

Shouldn't height and width be represented as a style? eg:

	style="height:31px;width:88px"

grant.