Honestly, who'd be a webmaster?
Or, at any rate, who'd be a webmaster without having a roomful of computers, all with different operating systems and browsers installed on them? I've no sooner installed IE8, so I can investigate problems people are having with that browser, than I have to un-install it, and then un-install IE7, so that I can look into a problem with IE6. Am I to spend my whole life installing and uninstalling software?
(Unfortunately, there's no simple way of having different versions of Internet Explorer installed on a computer at the same time. And although IE6 is now two versions ago, it's still the second most popular browser among Chi players - almost 30% use it. So I don't like to allow errors to continue, even if they're relatively minor.)
Anyhow, I think I've fixed the problem of the bars going below the line. IE6 was enforcing a minimum height, to allow room for a line of text - even though the bars contain no text. So I had to set the font size to zero, and suddenly everything was OK.