--- a/src/js/pop.js	Fri Apr 20 19:13:11 2012 +0200
+++ b/src/js/pop.js	Mon Apr 23 19:11:08 2012 +0200
@@ -9,7 +9,9 @@
 IriSP.PopcornReplacement.player = function(container, options) {
   /* the jwplayer calls the callbacks in the global space so we need to 
      preserve them this way */
-    var _this = this;
+  if (typeof IriSP._ === "undefined") {
+      return;
+  }
     
   this.callbacks = {
       onReady:  IriSP._.bind(this.__initApi, this),