lucy24 - 4:51 pm on Jun 27, 2011 (gmt 0)
It certainly looks right. When all else fails, paste it in afresh (I took this straight from the w3c dtd page [w3.org]:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
(Omit the space that keeps it from becoming an auto-link.)
Come to think of it, I've never used the second line. You could just leave it out and see if that shuts up the validator.