It’s kind of hard to “visualize” the problem this way, so a link to your site would be handy.
What version of ie are you running?
Because ie6 renders the box-model in it’s own, non-standards compliant, way. This causes different widths and heights for boxes in ie and compliant browsers such as firefox. But there are hacks for this kind of thing: tanhack; *html hack.
Hope this helps.
I think Giovanni responses your answer.
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