Help Loop Timer

programming flash
1

Hello there
I want to add timer in a loop.
for example

for (var i:Number = 1; i<100; i++) {
    var v:Number = Math.ceil(Math.random()*(1+stage.stageWidth-0))+0;
    var mc:enemyGreen= new enemyGreen();
    addChild(mc);
    mc.x=v;
    // want to add Some Timer Here so that i can run this loop in regular interval
}

Thanks in advance