diff --git a/src/rustbook/static/rustbook.js b/src/rustbook/static/rustbook.js
index fdefab28759..d8ab15260ed 100644
--- a/src/rustbook/static/rustbook.js
+++ b/src/rustbook/static/rustbook.js
@@ -1,4 +1,4 @@
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -8,66 +8,71 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+/*jslint browser: true, es5: true */
+/*globals $: true, rootPath: true */
 
-document.addEventListener("DOMContentLoaded", function(event) {
+document.addEventListener('DOMContentLoaded', function() {
+    'use strict';
 
-  document.getElementById("toggle-nav").onclick = toggleNav;
+    document.getElementById('toggle-nav').onclick = function(e) {
+        var toc = document.getElementById('toc');
+        var pagewrapper = document.getElementById('page-wrapper');
+        toggleClass(toc, 'mobile-hidden');
+        toggleClass(pagewrapper, 'mobile-hidden');
+    };
 
-  function toggleNav() {
-    var toc = document.getElementById("toc");
-    var pagewrapper = document.getElementById("page-wrapper");
-    toggleClass(toc, "mobile-hidden");
-    toggleClass(pagewrapper, "mobile-hidden");
-  }
+    function toggleClass(el, className) {
+        // from http://youmightnotneedjquery.com/
+        if (el.classList) {
+            el.classList.toggle(className);
+        } else {
+            var classes = el.className.split(' ');
+            var existingIndex = classes.indexOf(className);
 
-  function toggleClass(el, className) {
-     // from http://youmightnotneedjquery.com/
-     if (el.classList) {
-       el.classList.toggle(className);
-     } else {
-       var classes = el.className.split(' ');
-       var existingIndex = classes.indexOf(className);
+            if (existingIndex >= 0) {
+                classes.splice(existingIndex, 1);
+            } else {
+                classes.push(className);
+            }
 
-       if (existingIndex >= 0) {
-         classes.splice(existingIndex, 1);
-       } else {
-         classes.push(className);
-       }
-
-       el.className = classes.join(' ');
-     }
-  }
-
-  // The below code is used to add prev and next navigation links to the bottom
-  // of each of the sections.
-  // It works by extracting the current page based on the url and iterates over
-  // the menu links until it finds the menu item for the current page. We then
-  // create a copy of the preceding and following menu links and add the
-  // correct css class and insert them into the bottom of the page.
-  var toc = document.getElementById('toc').getElementsByTagName('a');
-  var href = document.location.pathname.split('/').pop();
-  if (href === 'index.html' || href === '') {
-    href = 'README.html';
-  }
-
-  for (var i = 0; i < toc.length; i++) {
-    if (toc[i].attributes.href.value.split('/').pop() === href) {
-      var nav = document.createElement('p');
-      if (i > 0) {
-        var prevNode = toc[i-1].cloneNode(true);
-        prevNode.className = 'left';
-        prevNode.setAttribute('rel', 'prev');
-        nav.appendChild(prevNode);
-      }
-      if (i < toc.length - 1) {
-        var nextNode = toc[i+1].cloneNode(true);
-        nextNode.className = 'right';
-        nextNode.setAttribute('rel', 'next');
-        nav.appendChild(nextNode);
-      }
-      document.getElementById('page').appendChild(nav);
-      break;
+            el.className = classes.join(' ');
+        }
     }
-  }
 
+    // The below code is used to add prev and next navigation links to the
+    // bottom of each of the sections.
+    // It works by extracting the current page based on the url and iterates
+    // over the menu links until it finds the menu item for the current page. We
+    // then create a copy of the preceding and following menu links and add the
+    // correct css class and insert them into the bottom of the page.
+    var toc = document.getElementById('toc').getElementsByTagName('a');
+    var href = document.location.pathname.split('/').pop();
+
+    if (href === 'index.html' || href === '') {
+        href = 'README.html';
+    }
+
+    for (var i = 0; i < toc.length; i++) {
+        if (toc[i].attributes.href.value.split('/').pop() === href) {
+            var nav = document.createElement('p');
+
+            if (i > 0) {
+                var prevNode = toc[i-1].cloneNode(true);
+                prevNode.className = 'left';
+                prevNode.setAttribute('rel', 'prev');
+                nav.appendChild(prevNode);
+            }
+
+            if (i < toc.length - 1) {
+                var nextNode = toc[i+1].cloneNode(true);
+                nextNode.className = 'right';
+                nextNode.setAttribute('rel', 'next');
+                nav.appendChild(nextNode);
+            }
+
+            document.getElementById('page').appendChild(nav);
+
+            break;
+        }
+    }
 });