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Next step -- does the HTML and CSS validate, at least with no errors, even if there are a few warnings? Trying to fix cross-browser issues with code that has errors can make you crazy, and table coding errors will trigger error-handling routines in browsers that are not nearly the same.
So start here:
W3C Validator - HTML [validator.w3.org]
W3C Validator - CSS [jigsaw.w3.org]
If the cross-browser issue continues even with error-free mark-up, then can you post a rough outline of the table that is structuring the page? (From the title of this thread, I assume you are structuring with a layout table)
By a rough outline, I mean eliminate all the non-essential bits and any specific urls/keywords - and show us just the parts that affect the width of the table.