This is happening more and more because other 
browsers are more forgiving than Netscape. This 
specific problem almost always occurs because a 
table tag wasn't closed correctly. IE will assume 
the table closing tag is suppsoed to be there and 
render the table anyway. Netscape won't. It 
requires the code to be correct before it will 
render the table.

Microsoft HTML editors like Frontpage have a 
tendency to write incorrect code. It's a subtle 
way of making sites IE-only. ^_^