diff --git a/index.php b/index.php
index b2e81e0..3c44203 100755
--- a/index.php
+++ b/index.php
@@ -66,8 +66,8 @@ switch ($mode) {
         break;
     case 'phase':
         $template = 'change.html.twig';
-        $variables['imageWithElement'] = 'img/'.$phase.'-with.png';
-        $variables['imageWithoutElement'] = 'img/'.$phase.'-without.png';
+        $variables['imageWithElement'] = 'img/'.$phase.'-with.jpg';
+        $variables['imageWithoutElement'] = 'img/'.$phase.'-without.jpg';
         $variables['step_count'] = $index;
 		// Store the participant ID with some simple validation to prevent SQL injection
 		if (isset($_POST['participantid'])) {
diff --git a/js/change.js b/js/change.js
index 8d32949..1f6e856 100644
--- a/js/change.js
+++ b/js/change.js
@@ -1,6 +1,6 @@
 // Script settings.
-var slideDuration = 500;
-var blankDuration = 200;
+var slideDuration = 600;
+var blankDuration = 400;
 
 // Script internals.
 var $currentSlide;