diff --git a/prototype/index.md b/prototype/index.md
index 0fcaf5b..7058782 100644
--- a/prototype/index.md
+++ b/prototype/index.md
@@ -35,4 +35,4 @@ button.
 
 </div>
 
-<div id="container" style="padding: 0px; margin: 0px;"></div>
+<div id="container" style="padding: 0px; margin: 0px;" tabindex="1"></div>
diff --git a/static/js/PointerCamera.js b/static/js/PointerCamera.js
index e713cf5..eb80d8e 100644
--- a/static/js/PointerCamera.js
+++ b/static/js/PointerCamera.js
@@ -46,8 +46,8 @@ var PointerCamera = function() {
     var onMouseMove = function(event) {self.onMouseMove(event); };
     var onMouseUp = function(event) {self.onMouseUp(event); };
 
-    document.addEventListener('keydown', onKeyDown, false);
-    document.addEventListener('keyup', onKeyUp, false);
+    listenerTarget.addEventListener('keydown', onKeyDown, false);
+    listenerTarget.addEventListener('keyup', onKeyUp, false);
     listenerTarget.addEventListener('mousedown', function(event) { if (event.which == 1) onMouseDown(event);}, false);
     listenerTarget.addEventListener('mousemove', function(event) { if (event.which == 1) onMouseMove(event);}, false);
     listenerTarget.addEventListener('mouseup', onMouseUp, false);