NavigateToURL code btns for Dreamweaver Frameset.

I want to make a Dreamweaver frame set / Fixed Top.

The web site has four pages therefore four btns.

The Dreamweaver site uses these prefixes to the pages.

idex.html  / mainFrame2.html / mainFrame3.html and mainframe4.html

The btns for those pages are...

btn1 / btn2  / btn3 / btn4

Here is an example of the site code, it doe's not work.

   btn1.addEventListener(MouseEvent.CLICK,btn1Click);

function btn1Click(evt:MouseEvent):void {
   var url:String = "http://poole-pc/WebSites/FrameSets/URLRequest/index.html";
   var req:URLRequest = new URLRequest(url);
   navigateToURL(req, "_self");   
   }

I need the btn code to use a naviagteToURL.

btn2.addEventListener(MouseEvent.CLICK,btn2Click);

   function btn2Click(evt:MouseEvent):void {
   var url:String= "http://poole-pc/WebSites/FrameSets/URLRequest/mainFrame2.html/mainFrame";
   var req:URLRequest = new URLRequest(url);
   navigateToURL(req,"_self");
   }

To define the page and mainfarme, here is how it used to worked in AS2.

on(release){
getURL("mainFrame2.html", "mainFrame");
}

Someone like myself whom has limited knowledge of any actionscript

AS3 seems clamy and convoluted.

Sabby76