ActionScript 3.0 :: Creating A Preloader For Contents From XML File?

I'm creating a portfolio which will load thumbnail pictures from a XML file.What I want to do, is simple, create a simple pre-loader for all the Thumbnails.My code is as follows:

Declare Variables =>

Quote:

var columns:Number;
var my_x:Number;
var my_y:Number;

[code]....

So, here is where the problem is. I want to show a progress clip (possibly one of those circle ones) while the Thumbnails are being loaded.What i have already tried to do is to add the code to insert a movieclip in the callThumbs function. But after that I couldn't remove the Progress child using the thumbLoaded function since it was declare in the previous function.