Simple AS3 question from a rookie...

I have a main shell swf file that has two buttons on it that should each launch/load their respective swf files (tool1, tool2). These should essentially replace the main swf file. Also, I have a button on tool1 & 2 that should bring you back to the main menu. All these files are then compiled into an exe. Seems easy enough, but I'm not entirely sure where to start.

So far I have:
import flash.display.*;
import flash.net.URLRequest;

tool1_btn.addEventListener(MouseEvent.CLICK, gotoTool1);

function gotoTool1 (e:MouseEvent):void{
Loader(this.parent).load(new URLRequest("tool1.swf"));
}


Any insight would be greatly appreciated.