Algo asi?
Código HTML:
var func = mx.transitions.easing.Bounce.easeOut;
setTimeout(doTween, 500, bus_mc, "_x", func, -120, 5, .9, true);
setTimeout(doTween, 750, bus_mc1, "_x", func, -120, 5, .9, true);
setTimeout(doTween, 1000, bus_mc2, "_x", func, -120, 5, .9, true);
function doTween(mc:MovieClip, prop:String, func:Function, init:Number, final:Number, time:Number, useSeconds:Boolean):Void
{
var mTw = new Tween(mc, prop, func, init, final, time, useSeconds);
}
Saluti.