Preloader with movies

Hello i’m with a problem with my preloader, and i don’t know if it’s a bug or if i’m doing something wrong.
the preloader is very simple, it just change a movie clip action while preloading. at 20% one action at 40% other action and so on… but it only works well till 60%.
well i have attached my fla so please someone check it to understand better my problem and if you can help please let me know.
thanks in advance

percentagem = int((100)/(_root.getBytesTotal())*(_root.getBytesLoaded()));
if (percentagem >= 20){
this.count.gotoAndStop(“1”);
trace(percentagem);
}
if (percentagem >= 40){
this.count.gotoAndStop(“5”);
trace(percentagem);
}
if (percentagem >= 60){
this.count.gotoAndStop(“10”);
trace(percentagem);
}
if (percentagem >= 80){
this.count.gotoAndStop(“15”);
trace(percentagem);
}
if (percentagem == 100){
this.gotoAndPlay(“main”);
trace(percentagem);
}

er… yes??

this.count.gotoAndStop(“1”);
trace(percentagem);
}
NOT
this.count.gotoAndStop(“5”);
trace(percentagem);
}