diff --git a/src/html5shiv-printshiv.js b/src/html5shiv-printshiv.js
index bc7fb34..852e8ce 100644
--- a/src/html5shiv-printshiv.js
+++ b/src/html5shiv-printshiv.js
@@ -2,6 +2,8 @@
 * @preserve HTML5 Shiv prev3.7.1 | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed
 */
 ;(function(window, document) {
+  'use strict';
+  
 /*jshint evil:true */
   /** version */
   var version = '3.7.0';
@@ -183,7 +185,7 @@
       return createElement(nodeName, ownerDocument, data);
     };
 
-    ownerDocument.createDocumentFragment = Function('h,f', 'return function(){' +
+    ownerDocument.createDocumentFragment = new Function('h,f', 'return function(){' +
       'var n=f.cloneNode(),c=n.createElement;' +
       'h.shivMethods&&(' +
         // unroll the `createElement` calls
@@ -332,7 +334,7 @@
     var node,
         nodes = ownerDocument.getElementsByTagName('*'),
         index = nodes.length,
-        reElements = RegExp('^(?:' + getElements().join('|') + ')$', 'i'),
+        reElements = new RegExp('^(?:' + getElements().join('|') + ')$', 'i'),
         result = [];
 
     while (index--) {
@@ -359,7 +361,9 @@
     // copy element attributes to the wrapper
     while (index--) {
       node = nodes[index];
-      node.specified && wrapper.setAttribute(node.nodeName, node.nodeValue);
+      if (node.specified) {
+        wrapper.setAttribute(node.nodeName, node.nodeValue);
+      }
     }
     // copy element styles to the wrapper
     wrapper.style.cssText = element.style.cssText;
@@ -377,7 +381,7 @@
     var pair,
         parts = cssText.split('{'),
         index = parts.length,
-        reElements = RegExp('(^|[\\s,>+~])(' + getElements().join('|') + ')(?=[[\\s,>+~#.:]|$)', 'gi'),
+        reElements = new RegExp('(^|[\\s,>+~])(' + getElements().join('|') + ')(?=[[\\s,>+~#.:]|$)', 'gi'),
         replacement = '$1' + shivNamespace + '\\:$2';
 
     while (index--) {
@@ -440,7 +444,7 @@
           collection = ownerDocument.styleSheets,
           cssText = [],
           index = collection.length,
-          sheets = Array(index);
+          sheets = new Array(index);
 
       // convert styleSheets collection to an array
       while (index--) {
diff --git a/src/html5shiv.js b/src/html5shiv.js
index 205bdfe..f13be3f 100644
--- a/src/html5shiv.js
+++ b/src/html5shiv.js
@@ -2,6 +2,8 @@
 * @preserve HTML5 Shiv prev3.7.1 | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed
 */
 ;(function(window, document) {
+  'use strict';
+  
 /*jshint evil:true */
   /** version */
   var version = '3.7.0';
@@ -37,14 +39,14 @@
         //if the hidden property is implemented we can assume, that the browser supports basic HTML5 Styles
         supportsHtml5Styles = ('hidden' in a);
 
-        supportsUnknownElements = a.childNodes.length == 1 || (function() {
+        supportsUnknownElements = a.childNodes.length === 1 || (function() {
           // assign a false positive if unable to shiv
           (document.createElement)('a');
           var frag = document.createDocumentFragment();
           return (
-            typeof frag.cloneNode == 'undefined' ||
-            typeof frag.createDocumentFragment == 'undefined' ||
-            typeof frag.createElement == 'undefined'
+            typeof frag.cloneNode === 'undefined' ||
+            typeof frag.createDocumentFragment === 'undefined' ||
+            typeof frag.createElement === 'undefined'
           );
         }());
     } catch(e) {
@@ -79,7 +81,7 @@
    */
   function getElements() {
     var elements = html5.elements;
-    return typeof elements == 'string' ? elements.split(' ') : elements;
+    return typeof elements === 'string' ? elements.split(' ') : elements;
   }
 
     /**