Browser compatiblity is a frustration many web designers and developers deal with on a daily basis. I've found that most of the problems can be solved by testing your pages with the W3C CSS Validator at http://jigsaw.w3.org/css-validator/. Various browsers do attempt to implement standard style sheets and often it's a programming error that makes the pages mis-behave. There are a few things that I've found just won't work - even with perfect coding; transparent png's in IE 6, custom scrollbars in Firefox among them. Dealing with the few problems is much easier once the basic code is tested and working. Let me know what you think of the 'validator'. Did it help you?