Pasting Text INTO FIELDS on Netscape

Help me please -
Here is what I am looking for.
I would like to open a specific webpage and insert different text into 4 different fields. Is it even possible to do this? I can script as far as opening the webpage. But that is it.
Can anyone help.

Model: OSX 10.2
AppleScript: 1.9
Browser: Netscape/7.2
Operating System: Mac OS X (10.4)