leanModel is setup on jQuery.ready()

lms/static/js/toggle_login_modal.js

@@ -87,6 +87,7 @@
     }
   });
 
+  $(document).ready(function($) {
       $("a[rel*=leanModal]").each(function(){
         $(this).leanModal({ top : 120, overlay: 1, closeButton: ".close-modal", position: 'absolute' });
         embed = $($(this).attr('href')).find('iframe')
@@ -100,4 +101,5 @@
           }
         }
       });
+  });
 })(jQuery);