Jeffrey, as a rule of thumb, you can have perfectly good pages in IE and NS4.x, which will not render in some way in the NS6/7 and Mozilla. You must have a 100% compliant site to w3c (is the c=code?) .
UserAgent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01
"I've got a very poor sense of direction. I keep forgetting which way is forwards."
WinXP, SP3, 512 MB, 3.0.15 regular, 3.5.5 regular and portable , TB2.0.0.23, Flock2.5.2, IE8.0, SM2.0, Google Chrome2.0.x, Safari4.0.4, Zone Alarm; AVG9.0, JRE1.6_17