Working on external scroll, within main timeline AS 3.0

hello everyone, I am getting constant flash-mate for the last few days. I ‘ve tried to applied button function to external swf,that is thumbnail panel with images, however, if I try url link (code is inside external panelc scroll):

panelc.img1_btn.addEventListener(MouseEvent.MOUSE_DOWN, thumbDownHandler);
function thumbDownHandler(event:MouseEvent):void {
navigateToURL(new URLRequest(”http://www.google.com”));
}

panelc.img2_btn.addEventListener(MouseEvent.MOUSE_DOWN, thumbDownHandler2);
function thumbDownHandler2(event:MouseEvent):void {
navigateToURL(new URLRequest(”http://www.yahoo.com”));

}

everything works, once scroll downloaded , I click image 1 goes to google, image 2 goes to yahoo, however, if I try to apply function to goto certain frame within the main timeline, using :

panelc.img3_btn.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler3);
function mouseDownHandler3(event:MouseEvent):void {
gotoAndStop(80);
}

panelc.img4_btn.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler4);
function mouseDownHandler4(event:MouseEvent):void {
gotoAndStop(81);
}
panelc.img5_btn.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler5);
function mouseDownHandler5(event:MouseEvent):void {
gotoAndStop(82);
}
etc…

-buttons dont react, I dont get any errors either, not sure what to do, first time flash user, want to go out take photos instead, pls can anyone give me any suggestions/hints, I ‘ve read every possible article, can’t make it working, thanks