Playing a sound if the user isn't on the page (IE window isn't top)

How would I go about playing some sort of a sound using jQuery only when the user is on another tab/window in their browser or their browser is minimized....


Im sure it will include something similar to:

$('body').append('<embed src="/path/to/your/sound.wav" autostart="true" hidden="true" loop="false">');

Code (markup):

But Im unfamiliar with the function, if there is one to only execute if not "top"...