diff --git a/js/modal.js b/js/modal.js
index 874f9b2..c333589 100644
--- a/js/modal.js
+++ b/js/modal.js
@@ -516,7 +516,7 @@
       }
       // If this element isn't in the dialog at all, then jump to the first
       // or last element to get the user into the game.
-      else if (tabbableElements.indexOf(node) == -1) {
+      else if ($.inArray(node, tabbableElements) == -1) {
         // Make sure the node isn't in another modal (ie. WYSIWYG modal).
         var parents = $(node).parents().get();
         for (var i = 0; i < parents.length; ++i) {