For Netscape Upgrades:

http://home.netscape.com/computing/download/index.html?cp=hom12p3

For Internet Explorer Upgrades:

If you are using windows 98, you can upgrade your browser by going to Microsoft's windows update page:

http://windowsupdate.microsoft.com

If you are using Windows 95 or NT you can upgrade your browser at:

http://www.microsoft.com/downloads/