AS3 DW frameset btn's function out in need of URLRquest mods

Hi

I'm new to DW Framesets and AS3...

URLRequest btns function out launching index.html in new browser.

mainFrame2 btn returns server error in application "DEFAULT WEB SITE"

Error summaryHTTP  Error 404.0 - Not Found

Same error with mainFrame3 btn and mainFrame4 btn.

In summary all four btns are not functioning out correctly.

Happy to stay up for the next four hours to solve it.

Sabby76

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);
}
btn2.addEventListener(MouseEvent.CLICK,btn2Click);

   function btn2Click(evt:MouseEvent):void {
   var url:String= "http://poole-pc/WebSites/FrameSets/URLRequest,mainFrame2.html";
   var req:URLRequest = new URLRequest(url);
   navigateToURL(req);
   }
btn3.addEventListener(MouseEvent.CLICK,btn2Click);

   function btn3Click(evt:MouseEvent):void {
   var url:String= "http://poole-pc/WebSites/FrameSets/URLRequest,mainFrame3.html";
   var req:URLRequest = new URLRequest(url);
   navigateToURL(req);
   }
btn4.addEventListener(MouseEvent.CLICK,btn2Click);

   function btn4Click(evt:MouseEvent):void {
   var url:String= "http://poole-pc/FrameSets/URLRequest,mainFrame4.html";
   var req:URLRequest = new URLRequest(url);
   navigateToURL(req);
   }
Thank you