diff --git a/src/Preload.js b/src/Preload.js
index ab63085..ee9700f 100644
--- a/src/Preload.js
+++ b/src/Preload.js
@@ -144,7 +144,7 @@ _html2canvas.Preload = function( options ) {
             }
 
           } else {
-            src = _html2canvas.Util.backgroundImage(background_image.definition);
+            src = _html2canvas.Util.backgroundImage(background_image.value);
             methods.loadImage(src);
           }
 
diff --git a/src/Util.js b/src/Util.js
index f17a70d..49f9fbb 100644
--- a/src/Util.js
+++ b/src/Util.js
@@ -1,4 +1,4 @@
-html2canvas = function( elements, opts ) {
+html2canvas = window.html2canvas = function( elements, opts ) {
 
   var queue,
   canvas,