Fix lint warnings in hello.js.

Also split the long lines in README.

examples/helloworld/README.md

@@ -1,7 +1,8 @@
 ## "Hello World" overview
 
 This example is a minimalistic application of the pdf.js project. The file 
-`helloworld.pdf` is from the GNUpdf project (see [Introduction to PDF at GNUpdf](http://gnupdf.org/Introduction_to_PDF), and contains a simple and 
+`helloworld.pdf` is from the GNUpdf project (see [Introduction to PDF at
+GNUpdf] (http://gnupdf.org/Introduction_to_PDF)), and contains a simple and
 human-readable PDF.
 
 
@@ -14,3 +15,4 @@ how to make basic calls to `pdf.js`.
 ## Additional resources
 
 + [GNUpdf - Introduction to PDF](http://gnupdf.org/Introduction_to_PDF)
+

examples/helloworld/hello.js

@@ -1,7 +1,11 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+
 //
 // See README for overview
 //
 
+'use strict';
 
 //
 // Ajax GET request, for binary files
@@ -21,12 +25,12 @@ var ajaxGet = function(url, callback){
     }
   };
   xhr.send(null);
-}
+};
 
 //
 // This is where the fun happens
 //
-ajaxGet('helloworld.pdf', function(data){
+ajaxGet('helloworld.pdf', function ajaxGetHelloWorld(data) {
   //
   // Instantiate PDFDoc with PDF data
   //
@@ -47,3 +51,4 @@ ajaxGet('helloworld.pdf', function(data){
   //
   page.startRendering(context);
 });
+