Browser compatibility is always provides fun and games, and often lots of frustration - but IE7 to be fair, is usually an easy one to get right - it's IE6 and IE8 that usually give problems, then your Safaris and Chromes more often than IE7.
What you need to try and do I'd say, is write compliant code, then you've got more chance of it working in the majority of browsers.
Check here, and you'll see what I mean.
http://validator.w3.org/check?uri=http%3A%2F%2Fwww.meatheadmania.com%2Fhom e.php&charset=%28detect+automatically%29&doctype=I nline&group=0