diff --git a/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSException.java b/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSException.java
new file mode 100644
index 00000000000..4ae02ffcb77
--- /dev/null
+++ b/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSException.java
@@ -0,0 +1,56 @@
+/* Insert copyright and license here 19** */
+
+package netscape.javascript;
+
+/**
+ * JSException is an exception which is thrown when JavaScript code
+ * returns an error.
+ */
+
+public
+class JSException extends Exception {
+    String filename;
+    int lineno;
+    String source;
+    int tokenIndex;
+
+    /**
+     * Constructs a JSException without a detail message.
+     * A detail message is a String that describes this particular exception.
+     */
+    public JSException() {
+	super();
+        filename = "unknown";
+        lineno = 0;
+        source = "";
+        tokenIndex = 0;
+    }
+
+    /**
+     * Constructs a JSException with a detail message.
+     * A detail message is a String that describes this particular exception.
+     * @param s the detail message
+     */
+    public JSException(String s) {
+	super(s);
+        filename = "unknown";
+        lineno = 0;
+        source = "";
+        tokenIndex = 0;
+    }
+
+    /**
+     * Constructs a JSException with a detail message and all the
+     * other info that usually comes with a JavaScript error.
+     * @param s the detail message
+     */
+    public JSException(String s, String filename, int lineno,
+                       String source, int tokenIndex) {
+	super(s);
+        this.filename = filename;
+        this.lineno = lineno;
+        this.source = source;
+        this.tokenIndex = tokenIndex;
+    }
+}
+
diff --git a/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSObject.java b/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSObject.java
new file mode 100644
index 00000000000..f93e51ace74
--- /dev/null
+++ b/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSObject.java
@@ -0,0 +1,131 @@
+/* -*- Mode: C; tab-width: 4; -*- */
+
+/* Insert copyright and license here 19** */
+
+/* more doc todo:
+ *  threads
+ *  gc
+ *  
+ *
+ */
+
+package netscape.javascript;
+
+import java.applet.Applet;
+
+/**
+ * JSObject allows Java to manipulate objects that are
+ * defined in JavaScript.
+ * Values passed from Java to JavaScript are converted as
+ * follows:<ul>
+ * <li>JSObject is converted to the original JavaScript object
+ * <li>Any other Java object is converted to a JavaScript wrapper,
+ *   which can be used to access methods and fields of the java object.
+ *   Converting this wrapper to a string will call the toString method
+ *   on the original object, converting to a number will call the
+ *   floatValue method if possible and fail otherwise.  Converting
+ *   to a boolean will try to call the booleanValue method in the
+ *   same way.
+ * <li>Java arrays are wrapped with a JavaScript object that understands
+ *   array.length and array[index]
+ * <li>A Java boolean is converted to a JavaScript boolean
+ * <li>Java byte, char, short, int, long, float, and double are converted
+ *   to JavaScript numbers
+ * </ul>
+ * Values passed from JavaScript to Java are converted as follows:<ul>
+ * <li>objects which are wrappers around java objects are unwrapped
+ * <li>other objects are wrapped with a JSObject
+ * <li>strings, numbers and booleans are converted to String, Float,
+ *   and Boolean objects respectively
+ * </ul>
+ * This means that all JavaScript values show up as some kind
+ * of java.lang.Object in Java.  In order to make much use of them,
+ * you will have to cast them to the appropriate subclass of Object,
+ * e.g. <code>(String) window.getMember("name");</code> or
+ * <code>(JSObject) window.getMember("document");</code>.
+ */
+public final class JSObject {
+    /* the internal object data */
+    private int                               internal;
+
+    /**
+     * initialize
+     */
+    private static native void initClass();
+    static {
+	System.loadLibrary("LiveConnect");
+        initClass();
+    }
+
+    /**
+     * it is illegal to construct a JSObject manually
+     */
+    private                          JSObject(int jsobj_addr) {internal = jsobj_addr;}
+
+    /**
+     * Retrieves a named member of a JavaScript object. 
+     * Equivalent to "this.<i>name</i>" in JavaScript.
+     */
+    public native Object	getMember(String name);
+
+    /**
+     * Retrieves an indexed member of a JavaScript object.
+     * Equivalent to "this[<i>index</i>]" in JavaScript.
+     */
+//    public Object		getMember(int index) { return getSlot(index); }
+    public native Object	getSlot(int index);
+
+    /**
+     * Sets a named member of a JavaScript object. 
+     * Equivalent to "this.<i>name</i> = <i>value</i>" in JavaScript.
+     */
+    public native void 		setMember(String name, Object value);
+
+    /**
+     * Sets an indexed member of a JavaScript object. 
+     * Equivalent to "this[<i>index</i>] = <i>value</i>" in JavaScript.
+     */
+//    public void 		setMember(int index, Object value) {
+//        setSlot(index, value);
+//    }
+    public native void 		setSlot(int index, Object value);
+
+    /**
+     * Removes a named member of a JavaScript object.
+     */
+    public native void 		removeMember(String name);
+
+    /**
+     * Calls a JavaScript method.
+     * Equivalent to "this.<i>methodName</i>(<i>args</i>[0], <i>args</i>[1], ...)" in JavaScript.
+     */
+    public native Object	call(String methodName, Object args[]);
+
+    /**
+     * Evaluates a JavaScript expression. The expression is a string 
+     * of JavaScript source code which will be evaluated in the context
+     * given by "this".
+     */
+    public native Object	eval(String s);
+
+    /**
+     * Converts a JSObject to a String.
+     */
+    public native String        toString();
+
+    // should use some sort of identifier rather than String
+    // is "property" the right word?
+  //    native String[]                         listProperties();
+
+
+    /**
+     * get a JSObject for the window containing the given applet
+     */
+    public static native JSObject	getWindow(Applet applet);
+
+    /**
+     * Finalization decrements the reference count on the corresponding
+     * JavaScript object.
+     */
+    protected native void	finalize();
+}
diff --git a/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSProxy.java b/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSProxy.java
new file mode 100644
index 00000000000..ee266c4a538
--- /dev/null
+++ b/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSProxy.java
@@ -0,0 +1,37 @@
+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ *
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+/* ** */
+/**
+ * The JSProxy interface allows applets and plugins to
+ * share javascript contexts.
+ */
+
+package netscape.javascript;
+import java.applet.Applet;
+
+public interface JSProxy {
+    Object  getMember(JSObject jso, String name);
+    Object  getSlot(JSObject jso, int index);
+    void    setMember(JSObject jso, String name, Object value);
+    void    setSlot(JSObject jso, int index, Object value);
+    void    removeMember(JSObject jso, String name);
+    Object  call(JSObject jso, String methodName, Object args[]);
+    Object  eval(JSObject jso, String s);
+    String      toString(JSObject jso);
+    JSObject    getWindow(Applet applet);
+}
diff --git a/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSUtil.java b/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSUtil.java
new file mode 100644
index 00000000000..6d3cab84048
--- /dev/null
+++ b/mozilla/js/ref/liveconnect/classes/netscape/javascript/JSUtil.java
@@ -0,0 +1,38 @@
+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ *
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+/* ** */
+
+package netscape.javascript;
+import java.io.*;
+
+public class JSUtil {
+
+    /* Return the stack trace of an exception or error as a String */
+    public static String getStackTrace(Throwable t) {
+	ByteArrayOutputStream captureStream;
+	PrintStream p;
+	
+	captureStream = new ByteArrayOutputStream();
+	p = new PrintStream(captureStream);
+
+	t.printStackTrace(p);
+	p.flush();
+
+	return captureStream.toString();
+    }
+}