tell that people to forget netscape and use ie 6 or opera 6.. if they dont hear you (they never hear us), tell them to get mozilla or netscape 6, if still not so they need to install netscape 4.79..
that probaly dont resolve your prior problem...
i would like to see the html source generated by your php, if it isn't possible, take a look for the tables: how many tables (html) are you using? one inside another.. i mean nested tables, do you know?
i had this type of problem nesting tables, netscape gets more and more slow if you nest more than 4 html tables. if you are programming for that crazy netscape people, try to remove nested tables, or reduce the levels to 4 (at maximum)
and sorry for my poor english.