Certainly is a bizarre statement. Maybe it’s old info for some much earlier versions?
I can’t seem to use background:url(‘xx.jpg’) no-repeat center center in IE6.
That’s a bit odd. Are you sure the image file is right? It is relative to the css file. Also make sure to use a semi-colon after the rule if any others follow.
EDIT: ah, looking at that link again, I see it says