Well in general if something works in everything else except IE6 the problem tends to lie in width/padding/margins css. Since your main info box is dropping down I'm going to take a guess and say that if you set a width to the surrounding elements and set overflow:hidden to them too then you'll start to see your problem, or end up fixing it. IE6 tends to take the width and then add the padding and margins onto that, whereas the other browsers do exactly the opposite.
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