The Problem:
When a user follows a link your Articulate presentation your presentation keeps playing in the background.
The Solution:
Over ride Articulate's function for opening URLs with the following code.
_global.my_pptHyperUrl = function(theurl){
getURL(theurl, "arttpopper");
_level0.ArtAPI.Pause()
}
_level44.pptHyperUrl = _global.my_pptHyperUrl

Try it here Right click and save this link to get the swf Save SWF