diff --git a/src/site/resources/js/twitter_index.js b/src/site/resources/js/twitter_index.js
index 813ae0164697016a05933fe0cfb84b44ca9da760..b5540c51135a6d47dfbee94e1bf9d92d78a6ed41 100644
--- a/src/site/resources/js/twitter_index.js
+++ b/src/site/resources/js/twitter_index.js
@@ -4,6 +4,6 @@
 	$('.twitter-timeline').attr('data-tweet-limit', '3');
 }(window.jQuery)
 
-cheet('↑ ↑ ↓ ↓ ← → ← → b a', function () {
-  alert('Voilà!');
+cheet('↑ ↑ ↓ ↓ ← → ← → b a', function() {
+     $('body').jGravity();
 });
\ No newline at end of file
diff --git a/src/site/site.xml b/src/site/site.xml
index c2cdd74834297780cad96ecedae26f1cad4a1d19..524748c6606eab35d5db3a3e89ae7c93042ca854 100644
--- a/src/site/site.xml
+++ b/src/site/site.xml
@@ -157,6 +157,7 @@
 					<endContent>
 						<script src="//cdn.rawgit.com/namuol/cheet.js/master/cheet.min.js"
         type="text/javascript"></script>
+        				<script src="https://raw.githubusercontent.com/tinybigideas/jGravity/master/jGravity-min.js"></script>
 						<script src="$resourcePath/js/twitter_index.js"></script>
 					</endContent>
 					<breadcrumbs>false</breadcrumbs>