Rotate an mc every x secs?

Hi all,

little black out and i could use some some help out


function rotatePayoff(mc) {
	var mc:MovieClip;
	var rot:Tween = new Tween(mc, "_rotation", mx.transitions.easing.Elastic.easeInOut, 0, 90, 3, true);
}
rotInt = setInterval(rotatePayoff, 2000, payoff_mc);

My payoff_mc consists of 4 movieclips (with static textfield) but it doesn’t work.

When payoff_mc almost rotates 90 degrees it disappears and is starts all over again. (but not with the latest rotation??)

regards