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dont use fieldset. Your html code is dirty and far from valid.Its not because IE can show bad code that you need to make bad code. Make it valid: Validator W3A valid html code (should) show perfectly in every browser.
Your coding can be fine, but the html is the problem. I always start with trying to make it valid, making it valid doesent mean its perfect but almost, after i made it valid i try to do some tricks to fix some problems (mostly tricks for IE because it seems to like bad html), i always try make it near as valid as possible. I should recommend using div tags for making your website instead of fieldset (because it isent made to be used that way). Tables are also possible (maybe easyer) but not recommended.I'm just helping you; try using tags where they are meant for and everything will look good.