Use this DOCTYPE
< !DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Strict//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”>
And IE 5.5+ and FireFox/Netscape should interpert your HTML/CSS similarly enough for you to be able to create an identical-looking site on all modern browsers!
Cross-browser compatibility used to be a huge pain, but with a little bit of research and getting the proper DOCTYPE I was able to create many cross-browser compatible tableless layouts 
Since IE 5 and NS 4.7 do not interpret CSS like it should be, I just dont bother checking my sites on them, they’re really outdated anyway
