diff --git a/mozilla/js/rhino/examples/checkParam.js b/mozilla/js/rhino/examples/checkParam.js
new file mode 100644
index 00000000000..23ab458d248
--- /dev/null
+++ b/mozilla/js/rhino/examples/checkParam.js
@@ -0,0 +1,100 @@
+/**
+ * checkParam.js
+ *
+ * The files given as arguments on the command line are assumed to be
+ * Java source code files. This program checks to see that the @param
+ * tags in the documentation comments match with the parameters for 
+ * the associated Java methods.
+ * <p>
+ * Any errors found are reported.
+ *
+ */
+defineClass("File")
+
+// Return true if "str" ends with "suffix".
+function stringEndsWith(str, suffix) {
+	return str.substring(str.length - suffix.length) == suffix;
+}
+
+/**
+ * Perform processing once the end of a documentation comment is seen.
+ *
+ * Look for a parameter list following the end of the comment and 
+ * collect the parameters and compare to the @param entries.
+ * Report any discrepancies.
+ * @param f the current file
+ * @param a an array of parameters from @param comments
+ * @param line the string containing the comment end (in case the 
+ *        parameters are on the same line)
+ */
+function processCommentEnd(f, a, line) {
+	while (line != null && !line.match(/\(/))
+		line = f.readLine();
+	while (line != null && !line.match(/\)/))
+		line += f.readLine();
+	if (line === null)
+		return;
+	var m = line.match(/\(([^\)]+)\)/);
+	var args = m ? m[1].split(",") : [];
+	if (a.length != args.length) {
+		print('"' + f.name + 
+		      '"; line ' + f.lineNumber +
+		      ' mismatch: had a different number' +
+		      ' of @param entries and parameters.');
+	} else {
+		for (var i=0; i < a.length; i++) {
+			if (!stringEndsWith(args[i], a[i])) {
+				print('"' + f.name + 
+				      '"; line ' + f.lineNumber +
+				      ' mismatch: had "' + a[i] +
+				      '" and "' + args[i] + '".');
+				break;
+			}
+		}
+	}
+}
+	
+/**
+ * Process the given file, looking for mismatched @param lists and 
+ * parameter lists.
+ * @param f the file to process
+ */
+function processFile(f) {
+	var line;
+	var m;
+	var i = 0;
+	var a = [];
+      outer:
+	while ((line = f.readLine()) != null) {
+		if (line.match(/@param/)) {
+			while (m = line.match(/@param[ 	]+([^ 	]+)/)) {
+				a[i++] = m[1];
+				line = f.readLine(); 
+				if (line == null)
+					break outer;
+			}
+		} 
+		if (i != 0 && line.match(/\*\//)) {
+			processCommentEnd(f, a, line);
+			i = 0;
+			a = [];
+		}
+	}
+	if (i != 0) {
+		print('"' + f.name + 
+		      '"; line ' + f.lineNumber +
+		      ' missing parameters at end of file.');
+	}
+}
+
+// main script: process each file in arguments list
+
+print("here");
+for (var i=0; i < arguments.length; i++) {
+	var filename = String(arguments[i]);
+	print("Checking " + filename + "...");
+	var f = new File(filename);
+	processFile(f);
+}
+print("done.");
+