Play multiple flash animation

Hi, i would like to randomly play multiple swf files one after one, like 
slideshow of swf files

 here is what i want:

 - load multiple external swf file from a main swf.
 - a swf play and when is finish the next one play, i mean the next one have to

wait that the first one is finishing play before playing.
 - if its possible, preload the swf file, so the user do not have to wait that 
all swf file have to load, i mean loading the first swf file, play it and 
preload the next one during the first one playing.
 - do all this randomly


 the code i attach serve to play one external files, i didnt know how to play 
multiple one.

 im not sure if the adobe interface attach code correctly, so i pasted here:

 import flash.display.*;
 import flash.net.URLRequest;
 var rect:Shape = new Shape();
 rect.graphics.beginFill(0xFFFFFF);
 rect.graphics.drawRect(0, 0, 500, 120);
 rect.graphics.endFill();
 addChild(rect);
 var ldr:Loader = new Loader();
 ldr.mask = rect;
 var url:String = "http://swffile.swf";
 var urlReq:URLRequest = new URLRequest(url);
 ldr.load(urlReq);
 addChild(ldr);
  
 thanks

 import flash.display.*;
 import flash.net.URLRequest;
 var rect:Shape = new Shape();
 rect.graphics.beginFill(0xFFFFFF);
 rect.graphics.drawRect(0, 0, 500, 120);
 rect.graphics.endFill();
 addChild(rect);
 var ldr:Loader = new Loader();
 ldr.mask = rect;
 var url:String = "http://swffiles.swf";
 var urlReq:URLRequest = new URLRequest(url);
 ldr.load(urlReq);
 addChild(ldr);