Load external swf flie with loading bar

how to load an external .swf flies with a load bar? from the main.swf

Situation :
i have a main.swf fle and i have a button on the main stage containing the code :

   
on (release) { 
loadMovieNum("pics.swf", 2); 
} 

 

which takes some sec to load the external pics.swf movie from the main swf.

Situation offered :
you can say put a loading bar on the pics.swf flie , so that when it loads it shows the loading bar.

Ans to the offered situation
Well i completely denied the idea of loading pics.swf file with containing the load bar inside the pics.swf movie.

Solution required:
[color=red]i want to load the pics.swf (external file) from main.swf file with having the loading bar inside the main.swf file.[/color]