Random function selection

1

hello,

I am trying to get a random MC to play every 15 seconds. Using setInterval.

Here is my code >
What seems to be incorrect is that the setInterval doesnt seem to be collecting the function which starts the MC.

function car1(){
car_mc._x = 1130;
car_mc.tween("_x",-300,4,“easeinSine”);
}
function car2(){
car_mc._x = 1130;
car_mc.tween("_x",-400,4,“easeoutSine”);
}
function automob(){
var ran:Number = Math.ceil(Math.random()*2);
carran;
trace (ran);
trace (car[ran]);
}
setInterval(automob,15000);