diff --git a/app/assets/javascripts/graph.js b/app/assets/javascripts/graph.js
deleted file mode 100644
index 434cf70a..00000000
--- a/app/assets/javascripts/graph.js
+++ /dev/null
@@ -1,10 +0,0 @@
-function initGraphNav() { 
-  $(".graph svg").css("position", "relative");
-  $("body").bind("keyup", function(e) {
-    if(e.keyCode == 37) { // left
-      $(".graph svg").animate({ left: "+=400" });
-    } else if(e.keyCode == 39) { // right
-      $(".graph svg").animate({ left: "-=400" });
-    }
-  });
-}
diff --git a/app/assets/javascripts/graph.js.coffee b/app/assets/javascripts/graph.js.coffee
new file mode 100644
index 00000000..5fe8ae3f
--- /dev/null
+++ b/app/assets/javascripts/graph.js.coffee
@@ -0,0 +1,10 @@
+initGraphNav = ->
+  $('.graph svg').css 'position', 'relative'
+
+  $('body').bind 'keyup', (e) ->
+    if e.keyCode is 37 # left
+      $('.graph svg').animate left: '+=400'
+    else if e.keyCode is 39 # right
+      $('.graph svg').animate left: '-=400'
+
+window.initGraphNav = initGraphNav