tedster - 9:19 pm on Sep 16, 2012 (gmt 0)
Welcome to the forums, soccrates.
Since you've already validated your source code (that's exactly the right way to begin this debug) tell us what your DTD is. Then let's start by describing the specific ways that your pages don't look good in Firefox and IE. Clearly these are very important browsers with a large share of the market.