Step 3
Now create your pop up window movie and name it popup.swf. This will automatically load your pop-up movie as you main movie is ending or starting which ever you prefer.
Close button
You will need to create a close button on your pop-up window. Simply create a button and assign the following actions to it under the load\unload movie action.
Foot note: This method can also be used for sounds as well. Instead of calling a pop up window call a sound file that you have made. Again only call the SWF not HTML.