preloader nan issue

[rebnonymous]

i'm using a preloader to load external swfs. i am using countdownNum and i keep getting Nan before it starts counting down from 10. Here's my script:


function newPreloader (swfToLoad:String) {
_level0.attachMovie("countdown", "countdown_mc", 20, {_x:101.5, _y:309.4});
loadMovieNum(swfToLoad, 1);

_level0.onEnterFrame = function () {
var countdownNum:Number = 10 - Math.ceil(10*(_level1.getBytesLoaded()/_level1.getBytesTotal()))
_level0.countdown_mc.countdown_txt.text = countdownNum;
if(!isNaN(countdownNum)){
_level0.countdown_mc.countdown_txt.text = countdownNum;
}
//if % loaded is > 99 then
// Clear onEnterFrame event and empty _level0, then start the main site
if (countdownNum<1) {
delete _level0.onEnterFrame;
_level0.countdown_mc.removeMovieClip();
_level1.play();
}
};
}

newPreloader ("rickgradone.swf");
stop();

Thanks!