Sometimes it centers the text and other times it right-justifies it. I've resolved the issue by telling our users that IE6 should be considered beta quality and therefore we cannot support it.
Actually, as has been discussed previously here (notably in Everything is centered and Weirdness under IE6), elements in IE6 inherit attributes from their parents. So nested tables, for example, will inherit their alignment from the outermost one unless specified otherwise.
"One word of warning: if you meet a bunch of Perl programmers on the bus or something, don't look them in the eye. They've been known to try to convert the young into Perl monks." - Frank Willison