I now know that the error that is returned to me has to do with cookies and being logged in and is not exclusive to Netscape.
If you are logged in, you do not see an error, simply the number of members and guests online. Doesn't matter if it is Netscape or IE.
However, if you are not a logged in member, it precedes the # of members with the following error:
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Warning: Oops, php3_SetCookie called after header has been sent in /home/babyu/babyuniversity-www/forums/global.php3 on line 754
Warning: Oops, php3_SetCookie called after header has been sent in /home/babyu/babyuniversity-www/forums/global.php3 on line 757
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The correct URL to view an example is
http://www.babyuniversity.com/test/php_test.shtml
Thanks for any ideas or suggestions!