Sorry
On to the meat of your request, it is my understanding that Blizz prevents this functionality from being available in the game. It'd be considered "third party software that affects the integrity of the game" (or however it is that they actually have it worded, can't get at their site right now to get the exact terminology they use). I may be wrong, and if so, someone point it out to me (I won't mind, honest!), but to the best of my knowledge, can't be done.