Sorry, it can't be an XHTML issue. I've just visited: http://www.brothercake.com/site/resources/scripts/tooltips/ ?PHPSESSID=411e3342f01499db60bf22680d2cddbd which is showing the styles in IE5.2. I also tested one of my other sites on my HD, and that is showing the styles in IE5.2 correctly. Both the sites I've tested from my HD are: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">