FireFox is not Netscape

Why do so many sites make this mistake?

[Lorel]

What would cause the following nested table set up to look perfect in the latest IE on the Mac but not Firefox? In Firefox the 2nd table is spread out to 760 px and it should be only 600 px wide. The page has a vertically scrolling background at 760 width but I don't see how that can be the problem. the page validates. The page looks fine on a PC at both 1024 and 800 Resolution in Firefox and IE. If anyone has any suggestions I would appreciate it.

<table align="center" width="760" cellpadding="0" cellspacing="0" border="0">
<tr><td align="center">

<table align="center" width="600" cellpadding="8" cellspacing="0" border="0">
<tr><td>
MAIN BODY TEXT HERE
</td></tr></table>

</td></tr></table>

[Lorel]

I figured out the problem. I had a long URL that was spreading the table wider than it should have been. It displays ok in IE but not firefox.