If your using relatively new versions in Win 95 or 98 and you installed in the default directories in drive C (as is usually the case):
In Netscape:
Open the folder c:\Program Files\Netscape\Users\default If you created a different user profile substitute that user name for default Back up the file bookmark.htm
In IE5:
Back up the folder c:\windows\Favorites If you're using floppies, it might be too big for one, so you might need to copy some folders to another floppy.
On the Mac, you should be able to "find" bookmarks or favorites and proceed similarly.