Noob question about implementing JSObject

Question

I'm trying to create an applet that can interact with the javascript on an HTML page and I am at Step 1 and getting errors. I have looked at for answers on this but found no solution. I'm just trying to compile this to see if I can call the f() function in javascript.
My first error is "Package netscape.javascript does not exist"
Second is "cannot resolve symbol : variable JSObject
it just goes from there...
Below is my code. Does anyone have guidance. This is my first applet.
import netscape.javascript.*;
import java.awt.*;
import java.applet.*;
import javax.swing.*;
public class asplp extends JApplet {
    static final String message = "Hello World!";
    private Font font = new Font("serif", Font.ITALIC + Font.BOLD, 36);
    public void init() {
        // set the default look and feel
        String laf = UIManager.getSystemLookAndFeelClassName();
          JSObject win = JSObject.getWindow(this);
          JSObject doc = (JSObject) win.getMember("document");
        JSObject loc = (JSObject) doc.getMember("location");
        String s = (String) loc.getMember("href");  // document.location.href
        win.call("f", null);                        // Call f() in HTML page
          try {
            UIManager.setLookAndFeel(laf);
        } catch (UnsupportedLookAndFeelException exc) {
            System.err.println ("Warning: UnsupportedLookAndFeel: " + laf);
        } catch (Exception exc) {
            System.err.println ("Error loading " + laf + ": " + exc);
            getContentPane().setLayout (null);
    public void paint (Graphics g) {
        super.paint(g);
        g.setColor(Color.blue);
        g.setFont(font);
        g.drawString(message, 40, 80);

Answer 1

The problem really is that there is no distribution for this Jar.... The classes are found in several places, but where they'd be on a Mac, I don't know... They don't come with Java, they come with the browser.
Of course, one solution I've seen is to use reflection to get a JSObject and it's methods... it's a bit more code, but it doesn't require having the actual classes to build.
What I did to get my copy of these classes is to find them in the Netscape 4.7 installation's files and pull the netscape.javascript classes out to make a little Jar that I use for development purposes. It's just the classes needed to compile them... I would post that Jar here except that I'm really unsure of any legal issues regarding doing that...
But if you can get a copy of Netscape 4.7... You could do a search for files containing "JSObject" and you'd find a jar or zip file there.