Looping Tweener

I can’t seem to figure out how to create an infinite looping animation. I’ve got a ring that pulses and fades out from behind a circle. I want it to continue endlessly, but only get it to work once. Anyone help? My code for the tween is below…

Tweener.addTween(pulse_mc, {alpha: 0, scaleX:1, scaleY:1, time:1.5, transition:"easeInOutSine"});