Someone Help Me?

I need very simple question about actionscript.
My problem is getbytesloaded.
and here is my idea and script:
createEmptyMovieClip("twinkle1",4);
twinkle1.loadMovie("mdl3_vid2.swf");
twinkle1._x = 5;
twinkle1._y = 100;
l = twinkle1.getBytesLoaded();
t = twinkle1.getBytesTotal();

and my problem is i don't know how can i code that works:

until twinkle1 is loaded loading text is shows.

HELP ME !!!
PLEASE.