Problems in preLoader for exterior movieClips

hi

i am trying to import a swf movieClip to my main stage, but since the swf contains large scale images, a added a preloader to it,

the preloader is in each swf, but when i load the swf to the stage of my main movie clip, sometimes it works fine and loads and some other time it doesn't!  Beloa is the preLoader that I am using:

stop();

addEventListener(Event.ENTER_FRAME,loading);

function loading(e:Event) {

var loaded = Math.round(stage.loaderInfo.bytesLoaded);//Download File Size

var total = Math.round(stage.loaderInfo.bytesTotal);//Total File Size

var getPercent = loaded/total;

preloading.txt.text = Math.round(getPercent*100);

if (loaded == total) {//File Download Finished Site or Project Open 2. frame

removeEventListener(Event.ENTER_FRAME,loading);

gotoAndPlay(2);

}

}

is the problem from the preloader or i have to add a code to the main swf to make it work properly?

anyone can give me a hand in solving this issue?

thanks